Medications

ALL # A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Permitted Conditionally Permitted Banned

1-androsterone

Banned

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Definition: Anabolic

Information:

A metabolite of testosterone and dihydrotestosterone with no legitimate therapeutic indication in the equine athlete
1,3-Dimethylamylamine

Iron Tiger, Forthane, Geranamine, DMAA, Floradrene

Banned

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Definition: Sympathomimetic

Information:

1,3-Dimethylamylamine is a stimulant that can affect performance and has no legitimate use in sports horses
3β-Hydroxy-5α-androstan-17-one

Banned

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Definition: Anabolic

Information:

A metabolite of testosterone and dihydrotestosterone with no legitimate therapeutic indication in the equine athlete.
4-chloromethandienone

Banned

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Definition: Anabolic

Information:

A synthetic anabolic steroid which has no legitimate therapeutic indication in the equine athlete
5α-Androst-2-ene-17-one

Banned

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Definition: Anabolic

Information:

A derivative of dihydrostetosterone (DHT) and metabolite of dehydroepiandrosterone (DHEA). It has no legitimate therapeutic indication in the equine athlete.
5α-Androstane-3α,17α-diol

Banned

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Definition: Anabolic

Information:

A metabolite of testosterone and dihydrotestosterone with no legitimate therapeutic indication in the equine athlete.
5α-Androstane-3α,17β-diol

Banned

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Definition: Anabolic

Information:

A metabolite of dihydrotestosterone (DHT) with no legitimate therapeutic indication in the equine athlete.
5α-Androstane-3β,17α-diol

Banned

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Definition: Anabolic

Information:

A metabolite of dihydrotestosterone (DHT) and dehydroepiandrosterone (DHEA) with no legitimate therapeutic indication in the equine athlete.
5α-Androstane-3β,17β-diol

Banned

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Definition: Anabolic

Information:

A metabolite of dihydrotestosterone (DHT) and dehydroepiandrosterone (DHEA) with no legitimate therapeutic indication in the equine athlete.
5β-Androstane-3α,17β-diol

Banned

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Definition: Anabolic

Information:

A metabolite of dihydrotestosterone (DHT) and dehydroepiandrosterone (DHEA) with no legitimate therapeutic indication in the equine athlete.
7-Keto-DHEA

Banned

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Definition: Anabolic

Information:

A prohormone of dehydroepiandrosterone (DHEA) with no legitimate therapeutic indication in the equine athlete.
7α-Hydroxy-DHEA

Banned

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Definition: Anabolic

Information:

A metabolite of dehydroepiandrosterone (DHEA) with no legitimate therapeutic indication in the equine athlete.
7β-Hydroxy-DHEA

Banned

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Definition: Anabolic

Information:

A metabolite of dehydroepiandrosterone (DHEA) with no legitimate therapeutic indication in the equine athlete.
17 alpha hydroxyprogesterone (in mares)

Hydroxyprogesterone Caproate, Hydroxyprogesterone Hexanoate

Conditionally Permitted

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Definition: Hormone

Information:

17 alpha hydroxyprogesterone is a progestogen used suppress oestrus and maintain pregnancy in mares.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
17 alpha hydroxyprogesterone (in stallions & geldings)

Hydroxyprogesterone Caproate, Hydroxyprogesterone Hexanoate

Banned

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Definition: Anabolic

Information:

LISTED ACCORDING TO LIST PRINCIPLES

17 alpha hydroxy progesterone has been formulated as synthetic ester derivatives of the natural endogenous steroid, 17 alpha progesterone. Commercially as a slow release ester in an oily depot suspension for intramuscular use, it has long and very variable excretion times in horses. There are also some oral paste formulations. It has been widely used in human medicine for menstrual disorders and hormonal deficiencies in pregnancy.

Similar to other synthetic progestogens, HPH is used for estrus suppression and pregnancy maintenance in mares. It is also indicated for progesterone deficiency in mares and associated behavioural problems. In stallions and geldings it has an anabolic effect.
17-hydroxyprogesterone hexanoate (in mares)

Conditionally Permitted

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Definition: Hormone

Information:

17-hydroxyprogesterone hexanoate may be used to synchronise oestrus in mares.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
17-hydroxyprogesterone hexanoate (in stallions & geldings)

Banned

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Definition: Hormone

Information:

17-hydroxyprogesterone hexanoate may be used to synchronise oestrus in mares.
19-Norandrosterone

Banned

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Definition: Anabolic

Information:

A metabolite of nandrolone and bolandione with no legitimate therapeutic indication in the equine athlete.
19-Noretiocholanolone

Banned

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Definition: Anabolic

Information:

A metabolite of nandrolone and bolandione with no legitimate therapeutic indication in the equine athlete.
20-Hydroxyecdysone

Banned

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Definition: Anabolic

Information:

A substance that enhances physical performance and has anti-arrhythmia effects. It is also used in the treatment of rheumatoid arthritis. The substance has no legitimate therapeutic indication in the equine athlete.
Acebutolol2

Sectral, Monitan, Rhotral, Pindalol, Neptall, Prent

Banned

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Definition: Beta blocker

Information:

Often combined with diuretic, Acebutolol is available as prescription-only medicine (POM) in UK & USA for human use, not in animals. High potential for influencing performance; prohibited by equine control bodies.
Acefylline

Etaphylline, Etophylate

Banned

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Definition: Bronchodilator

Information:

Acefylline may relieve bronchospasms and the effects of pulmonary oedema, often combined for instance with Benadryl for motion sickness in humans. Not licensed for horses; high potential to influence performance.
Acemetacin

Emflex

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

It is licensed as prescription-only in the UK (POM) for human use; widely available without prescription in other countries. High potential to influence performance.
Acenocoumarol

Sintrom, Sinthrome

Banned

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Definition: Anticoagulant

Information:

Carefully controlled use, with close monitoring of blood clotting times, is required where Acenocoumarol is used in prescription only (UK POM, FDA control in USA) human medicine & for companion animals by licensed practitioners. High potential for influencing performance; prohibited by equine control bodies.
Acepromazine

ACP, Sedalin Gel, Atrovet, PromAce, Notensil, Acetylpromazine

Conditionally Permitted

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Definition: Sedative

Information:

Acepromazine may be used to reduce anxiety and sedate horses.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Acetaminophen (Paracetamol)

Anacin3, Mersyndol, Panadol, Pardale-V, Syndol, Tempra, Tylenol

Conditionally Permitted

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Definition: Analgesic

Information:

Acetaminophen (Paracetamol) may be used to relieve pain and control fever.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Acetanilid

Antifebrin, Ethananalide, N-acetylanaline,2-Acetanalide

Banned

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Definition: Analgesic/antipyretic

Information:

Acetanilid is rapidly excreted as salicyluric acid; urine may test positive for sugar. Acetanilid, as Antifebrin, is little used now due to gastric irritation and toxicity causing methaemoglobinaemia with severe liver and kidney damage. High potential for influencing performance.
Acetazolamide

Acemit, Azomid, Diamox, Glaupax, Novo-Zolamide, Storzolamide

Conditionally Permitted

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Definition: Diuretic

Information:

Acetazolamide may be used in the control of seizures, glaucoma and oedema.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Acetohexamide

Dymelor

Banned

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Definition: Pancreatic stimulant

Information:

Acetohexamide is prescription-only human medicine; it is unsuitable for insulin-dependent diabetes mellitus (IDDM), as it requires functioning pancreas for endogenous insulin production. Use has been associated with increased risk of cardiovascular mortality.
Acetophenazine

Tindal, Fluphenazine

Banned

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Definition: Antipsychotic

Information:

Acetophenazine has prescription-only use in human medicine as a tranquilliser for appropriate psychoses; an anthelminthic phenothiazine/piperazine mixture is licensed for horses (not pregnant mares), and used as a tranquilliser. Moderate potential for influencing performance.
Acetophenetidin (Phenacetin)

Codempiral, Commotional, Contradouleur, Emprazil, P-A-C Compound, Paramette, Phenaphen Plus, Stellacyl, Thephorin A-C

Banned

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Definition: Analgesic

Information:

It has analgesic and antipyretic properties.
Acetylmorphine

Trade names are not currently listed on this site.

Banned

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Definition: Narcotic

Information:

No current medical application exists. There has been experimental epidural use of the analogue hydromorphone in horses for analgesia of perineal, sacral, lumbar & thoracic pain (Louisiana State University School of Veterinary Medicine). High potential for influencing performance.
Adinazolam

Deracyne, Adinazolam is available by generic name

Banned

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Definition: Anxiolytic

Information:

Adinazolam is prescription-only human medicine used for anxiety and status epilepticus; it rapidly metabolises to active products (including estazolam). Estazolam, marketed in UK, USA and Asia for insomnia treatment, has additional skeletal muscle relaxant action. High potential for influencing performance.
Adiphenine

Spasnil oral, Fulton anti-douleur capsule

Banned

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Definition: Antispasmodic

Information:

Adiphenine may be combined with other medicines in prescription-only products for symptomatic relief of spasms associated with IBD, dysmenorrhoea, cystitis. High potential for influencing performance in affected individuals.
Adrafinil

Olmifon, Provigil, Vigil, Modasomil, Modiadal, Modalert, Provake, Resotyl, Alertex

Banned

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Definition: Stimulant

Information:

Adrafinil is available from outside USA (including Europe) in unregulated products, used off-label (often by night shift workers) to avoid fatigue, and for Attention Deficit Hyperactive Disorder (ADHD); prohibited in human sports. Modafinil is licensed in Europe, Asia, North and South America to relieve effects of MS, depression fatigue, myotonic dystrophy, cerebral palsy. High potential to influence performance.
Adrenaline

Adrenalin, Epinephrine, Anapen, Epipen, Twinject

Conditionally Permitted

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Definition: Hormone

Information:

Adrenaline may be used in the treatment of anaphylaxis, cardiac arrest and asthma.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Adrenochrome

Kentucky Red, Adrenosem salicylate, Adrestat-F, Dot-Chrome-DS, Stadren, Adona, Golcort

Banned

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Definition: Haemostatic

Information:

As a pigmented chemical, Adrenochrome is essentially uncontrolled in USA, though must conform to regulations for nutritional supplements where sold as such, or be regulated by the FDA as drug or foodstuff. In horses it reduces exercise induced pulmonary haemorrhage and has been prohibited by some competitive bodies due to potential for influencing performance in affected horses.
Adrenocorticotrophic hormone (ACTH)

ACTH

Conditionally Permitted

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Definition: Hormone

Information:

ACTH (Adrenocorticotrophic hormone) simulates the production of endongenous steroids.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
AICAR

AICAR

Banned

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Definition: Anabolic

Information:

AICAR is a peptide that can have anabolic effects in the horse by converting fast-twitch muscle fibres to more energy-efficient slow-twitch types of fibres. It also increases blood flow to enhance the horse's performance.
Albuterol (Salbutamol)

Ventolin, Proventil, Torpex, Volmax, Ventipulmin

Conditionally Permitted

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Definition: Bronchodilator

Information:

Albuterol (salbutamol) may be used in the treatment of respiratory disease.

The detection time is estimated with 96 hours (4 days) after inhalational administration.

A detection time is not the same as a withdrawal time. The detection time is the approximate period of time for which a substance (or its metabolite) remains in a horse's system such that it can be detected by the laboratory. The withdrawal time for a substance adds a safety margin, chosen with professional judgment and discretion to allow for individual differences between horses such as size, metabolism, degree of fitness, recent illness or disease etc.. You are advised to seek suitable advice from your treating veterinarian.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Alclofenac

Preservex, Prinalgin, Zumaril

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

Alclofenac is licensed for human acute and chronic pain conditions; not for horses. Rapid-acting,it reaches high levels in joint tissue; half-life of metabolites in urine is around 35 hours. High potential to affect performance.
Alcuronium

Alloferin, Acenkoumarol

Banned

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Definition: Muscle relaxant

Information:

Alcuronium is most often used to assist surgical anaesthesia; also assists management of respiratory problems in tetanus. High potential to affect performance.
Aldosterone

Florinef, Aldocortin, Electrocortin

Banned

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Definition: Hormone

Information:

Aldosterone is used to treat electrolyte imbalances in endocrine disorders such as adrenal insufficiency (Addison's disease). Significant potential to affect performance; use in horses is prohibited by equine control bodies. Urinary excretion products include pregnanediol as for other hormones, so blood testing is preferred.
Alendronate

Fosamax

Banned

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Definition: Bone metabolism agent

Information:

A bisphosphonate drug used for the treatment of osteoporosis and other bone diseases. It is considered a risk to equine welfare and has no legitimate therapeutic indication in the equine athlete.
Alfentanil

Alfenta, Rapifen

Banned

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Definition: Narcotic

Information:

Alfentanil is classified as Controlled Drug (CD) Schedule II in UK and USA; licensed for use by registered veterinary practitioners for surgical analgesia in companion animals. Not licensed for equine use.
Allopurinol

Zyloprim, Aloprim, Zyloric, Progout, Alluline, Allohexal

Banned

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Definition: Xanthine oxidase inhibitor (anti-hyperuricaemia)

Information:

Allopurinol is not licensed for animal use; off-licence use by veterinary practitioners in UK and USA, for example, helps reduce uric acid levels causing urolithiasis formation in companion animals and gout in birds and reptiles. It aids treatment of Leishmaniasis.
Almotriptan

Almogran, Axert, Almogran, Sumatriptan

Banned

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Definition: 5-hydroxatryptamine agonist (antimigraine)

Information:

Almotriptan is used to abort migraine or cluster headaches (not preventative or cure) and for sound and light phobias. Not licensed for animal use; significant potential to influence performance in affected horses.
Alpha-Casozepine

Zylkene

Conditionally Permitted

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Definition: Sedative

Information:

A peptide originating from cows milk which has calming effects on horses

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Alphadolone acetate

Althesin, Saffan

Banned

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Definition: Neurosteriod

Information:

Alphadolone acetate mixed with Alphaxolone has been licensed for veterinary use in cats and monkeys in UK; not for use in horses. High potential to influence performance.
Alphaprodine

Maxitram, Ultram, Ryzolt, Ralivia, Zytram, Zamadol, Ultracet, Tramacet

Banned

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Definition: Opiod analgesic

Information:

Alphaprodine controls moderate to severe pain for acute procedures and chronic conditions; it is rapidly absorbed, with high tissue affinity,plasma half-life 7 hours; urinary exctretion 30% unchanged. Not licensed for horses. High potential to affect performance.
Alpidem

Ananxyl

Banned

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Definition: Anxiolytic

Information:

Alpidem is prescription-only licensed for moderate to severe anxiety without sedation at normal dose rates; very high doses have anti-convulsant effects. Not approved for use in horses, and prohibited by equine control bodies. It was withdrawn from most countries after reports of severe liver damage from the product named Ananxyl.
Alprazolam

Xanax, Niravam, Alprazolam

Banned

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Definition: Anxiolytic

Information:

Alprazolam is prescription-only licensed for acute tranquiliser and amnesia effects in animals for the control of anxiety or fear-related conditions often associated with panic episodes such as car journeys, or noise-phobias. Not approved for equine use. Has high potential to influence performance.
Alprenolol

Regletin, Aptine

Banned

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Definition: Beta blocker

Information:

Alprenolol reduces hypertension associated with increased heart rate and/or force of contraction, for example in thyrotoxicosis, arrhythmia. Potential for small animal use. Not approved for equine use.
Althesin

Saffan, Alfaxan

Banned

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Definition: IV anaesthetic

Information:

Althesin is licensed for registered veterinary practitioner use in anaesthesia of cats and monkeys and unlicensed use in other small mammals. Not for use in horses; high potential to affect performance.
Althiazide

Hydrochlorothiazide, Apresazide, Aldoril, Avalide, Capozide, Accuretic

Banned

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Definition: Diuretic

Information:

Althiazide is widely used for hypertension, congestive heart failure and oedema; often with potassium supplement or angiotensin-converting enzyme (ACE) inhibitor to cancel out potassium loss; chronic use produces peripheral vasodilatation. High potential to affect performance.
Altrenogest (permitted in mares; not permitted in stallions or geldings)

Regumate

Permitted

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Definition: Hormone

Information:

Not permitted in geldings or stallions. Altrenogest is a progestin used in the synchronisation and suppression of oestrus in mares.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Alverine

Spasmonal, Profenil, Spasmine

Banned

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Definition: Antispasmodic

Information:

Alverine is available world-wide without prescription for relief of painful oestrus, colic, and other irritable or painful bowel conditions.
Amantadine

Symmetrel, Lysovir, Endantadine

Conditionally Permitted

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Definition: Dopamine agonist

Information:

Amantadine may be used in the treatment of viruses and pain

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Ambenonium

Mytelase, Myeuran, Ambegon

Banned

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Definition: Cholinesterase inhibition

Information:

Ambenonium chloride salts are prescription-only products used by medical and veterinary practitioners treating muscle weakness caused by diseases such as myasthenia gravis. High potential to affect performance.
Ambroxol

Mucosalvan, Ambril, Ambrosan, Amxol

Conditionally Permitted

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Definition: Mucolytic

Information:

Ambroxol may be used in the treatment of respiratory disease.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Ambucetamide

Neomeritine, Femerital, Dibutamide

Banned

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Definition: Antispasmodic

Information:

Ambucetamide, originally licensed for dysmenorrhoea, remains available for treating spasmodic menstrual and intestinal pain, though no longer marketed in USA. Not approved for animal use. High potential to affect performance in affected patients.
Amcinonide

Cyclocort, Aminocide Cream

Conditionally Permitted

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Definition: Corticosteroid

Information:

Amcinonide reduces inflammation, swelling, itching and irritation associated with various skin disorders.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Amfepramone

Tenuate, Tepanil, Atractil

Banned

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Definition: Stimulant

Information:

Amfepramone is licensed as anti-obesity medicine with off-label use for migraine relief; it behaves like dexamphetamine. Schedule II controlled in USA, it is rapidly absorbed from gut, and extensively metabolised to active products.
Amfetaminil

Aponeuron, Aphetaminil

Banned

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Definition: Stimulant

Information:

Amfetaminil was used to treat obesity and narcolepsy but withdrawn due to abuse. Helpful in children with hyperactivity disorders such as Attention Deficit Hyperactivity Disorder (ADHD). Not officially available in most countries. High potential to affect performance.
Amidephrine

Dricol

Banned

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Definition: Vasoconstrictor

Information:

Amidephrine mesylate is included in many non-prescription nasal decongestant preparations. Also used by licensed practitioners to improve circulation to organs and tissues, and may be given with atropine for reflex bradycardia. High potential to affect performance.
Amiloride

Moduretic, Midamor, Safaretic tab, Amiloride, Amilamont oral solution, Moduretic, Actaris tab, Aminide tab

Banned

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Definition: Diuretic

Information:

Amiloride is given by medical and veterinary practitioners, often with thiazide therapy, to balance potassium loss in hypertension and congestive heart failure. In hepatic cirrhosis it helps prevent metabolic alkalosis. High potential to influence performance.
Amineptine

Survector

Banned

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Definition: Tricyclic antidepressant

Information:

Amineptine helps relieve melancholic, unmotivated low-grade depression; does not affect cognition or anxious/agitated depression. Off-label investigative use includes Parkinsonism, Attention Deficit Hyperactive Disorder (ADHD), Amotivational syndrome. Significant potential to affect performance.
Aminocaproic Acid

Amicar, Caprocid, Hamostat tab, Hamostat inj, Hemocid injection

Conditionally Permitted

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Definition: Anti-fibrinolytic

Information:

Aminocaproic acid may be used in the treatment of bleeding disorders.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Aminoglutehthamide

Cytodren

Banned

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Definition: Aromatase inhibitor

Information:

Aminoglutehthamide is prescription-only licensed for medical and veterinary practitioner use in treatment of Cushing's syndrome (hyperadrenocorticism); and for human metastatic breast and prostate cancer therapy; abused by body-builders. Plasma half-life 13 hours; half a single dose excreted unchanged in urine over 48 hours. High potential to affect performance; prohibited in all sports.
Aminoheptane

2-aminoheptane sulphate

Banned

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Definition: Vasopressor

Information:

Aminoheptane,as 2-aminoheptane sulphate; is used in human medicine as nasal decongestant and in sinusitis and rhinitis preparations. Not approved for animal use; significant potential to affect performance; prohibited by equine control bodies.
Aminomethylbenzoic acid

Trasylol tissue glue, Gumbix, AmBenamp, Fluka

Banned

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Definition: Anti-fibrinolytic

Information:

Aminomethylbenzoic acid has been used to control bleeding in wounds during dental procedures,and in deep surgical sites such as ears or abdomen; the FDA-licensed injection was withdrawn May 2008 due to high risk of serious effects. Used in tissue glue.
Aminophylline

Ami-nesine, Ami-lone, Etamyphylline derivative, Millophylline-V, Dalophylline gel

Conditionally Permitted

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Definition: Bronchodilator

Information:

Aminophylline may be used in the treatment of respiratory diseases.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Aminopicoline

Picolamine 3MP

Banned

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Definition: Nitric oxide synthase inhibitor

Information:

Aminopicoline suppresses Nitric Oxide Synthase (NOS) activity, which includes response to inflammatory conditions, smooth muscle relaxation causing vasodilation (endothelial NOS), and peripheral and central nerve cell communication (neuronal NOS); reduced testicular NOS affects fertility and control of cytokines and hormones here. Not licensed for animal use; high potential to affect performance.
Aminopromazine

Jenotone

Banned

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Definition: Antispasmodic

Information:

Aminopromazine fumarate is licensed for veterinary practitioner use in the relief of excessive muscle contraction, such as in urolithiasis in dogs and cats, colic in horses; other intestinal irritation. May also help uterine spasms.
Aminopterin

Aminopterin sodium, Deoxyfolic acid sodium salt, Aantifolic acid, APGA

Banned

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Definition: Immunosuppressant

Information:

Introduced for child leukaemia treatment,but replaced in mid-1960s by methotrexate, the use of Aminopterin is finding favour again in chemotherapy. Good results reported (USA off-label use) in psoriasis. No therapeutic use in animals. Used in cell culture media.
Aminorex

Menocil

Conditionally Permitted

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Definition: Parasympathomimetic

Information:

Aminorex is a situmlant and a metabolite of levamisole, a Controlled Medication.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Amiodarone

Pacerone tablets, Nexterone injection, Cordarone-X injection, Amiodarone HCl tablets

Conditionally Permitted

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Definition: Anti-arrhythmic

Information:

Amiodarone may be used in the treatment of heart rhythm abnormalities.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Amiphenazole

Daptazile, Daftazole

Banned

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Definition: Stimulant

Information:

Amiphenazole was widely used as an antidote to barbiturate or opiate overdoses, other sedative poisoning, or respiratory failure (now often replaced by doxapram, specific antagonists). Large doses slowly eliminated,effective 2-3 days; high potential to affect performance.
Amisometradine

Aminoisometradine, Rolicton

Banned

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Definition: Diuretic

Information:

Licensed for mild to moderate oedema states in congestive heart failure and liver cirrhosis, use of Amisometradine must be intermittent, or tolerance develops. Significant potential to affect performance.
Amisulpride

Solian, Amisulpride

Banned

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Definition: Antipsychotic

Information:

Amisulpride is licensed as a neuroleptic for acute and chronic human schizophrenic disorders; also causes somnolence or sedation. No therapeutic indication in animals; high potential to affect performance.
Amitriptylline

Amitriptyline, Endep, Elavil, Elanil, Triptafen, Triaval, Amitone tab, Tryptamol tab, Qualitriptine tab

Banned

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Definition: Tricyclic antidepressant

Information:

Prescription-only products are used in human medicine for all types of major depression, neuropathic and chronic pain, insomnia, restlessness, and in veterinary medicine for obsessive grooming behaviour, inappropriate urination and separation anxiety. High potential to affect performance.
Amlodipine

Norvasc, Istin, Amlostin, Caduet, Lotral, Exforge

Banned

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Definition: Antihypertensive

Information:

Amlodipine besylate is often combined in prescription-only products in human and veterinary medicine for systemic hypertension, for refractory cardiac failure (dogs); all forms of human angina. Not approved for use in horses.
Ammonium Chloride (injection)

An inorganic compound with the formula NH4Cl.

Banned

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Definition: Acidifying agent

Information:

An inorganic compound with the formula NH4Cl, ammonium chloride is a white crystalline salt, highly soluble in water. Solutions of ammonium chloride are mildly acidic. Sal ammoniac is a name of the natural, mineralogical form of ammonium chloride.
Ammonium Sulphate

Banned

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Definition: Nerve-blocking agent

Information:

Used for surface anaethesia
Ammonium sulphide

Banned

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Definition: Nerve-blocking agent

Information:

Used for surface anaesthesia
Amobarbital

Isomytal injection, Amytal Sodium, Amytal, Tuinal, Seconal Sodium Pulvules

Banned

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Definition: Sedative

Information:

Amobarbital sodium is Federal Controlled in USA, used as a sedative, short-term insomnia or anxiety treatment,and pre-anaesthetic mediation. High lipid solubility means rapid tissue penetration; hepatic metabolism produces mostly changed urine excretion over 5-6 days. Testing of oral fluid has been proposed. High potential to affect performance.
Amodiaquine

Camoquin, Basoquin, Camoquin, Flavoquin

Banned

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Definition: Antimalarial

Information:

Besides being licensed for malarial treatment and prophylaxis, Amodiaquine has been tried with varied success for amoebia and giardia infection, in rheumatoid arthritis and mild lupus erythematosis. Not approved for animal use; may affect performance.
Amopyroquine

Propoquin

Banned

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Definition: Antimalarial

Information:

Amopyroquine (also called Propoquin or Amopyrochinum) has been used to treat chloroquine-resistant malaria and for rheumatoid arthritis treatment. It has not been approved for animal use but may potentially affect performance.
Amoxapine

Amoxapine Tablets USP, Ascendin, Demolox, Mocadil

Banned

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Definition: Tricyclic antidepressant

Information:

Amoxapine is prescription-only, licensed for use in various types of human depressive, anxiety and panic disorders. Also used for psychogenic dermatoses in dogs and cats. Not approved for equine use.
Amperozide

Hogpax

Banned

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Definition: Antipsychotic

Information:

Amperozide was not adopted for clinical use in human medicine. It is licensed for veterinary use in intensive pig farming to reduce aggression and stress levels, and improve feed uptake and productivity. Not approved for equine use.
Amphetamine

Benzadrine, Adderall, Dexedrine, Speed

Banned

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Definition: Stimulant

Information:

Amphetamine is a Controlled Drug in many countries: Schedule II (USA), III (Canada), Class B (UK),S8 (Aust). It has few veterinary uses, but is used mainly as an analeptic causing hyperventilation. High potential to affect performance, used illegally for recreational purposes, and prohibited by all competition control bodies. Most excreted unchanged in urine.
Amphetaminil

Trade names are not currently listed on this site.

Banned

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Definition: Stimulant

Information:

Amphetaminil (or Amfetaminil) was licensed for treating obesity (appetite suppression), Attention Deficit Hyperactive Disorder (ADHD), and narcolepsy, withdrawn due to abuse. Other derivatives are prescribed for chronic fatique and traumatic brain injury.
Ampyrone

SolvapyrineA, Metapyrazone, Aminoazaphene, Pyronpac, Dipyrone

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

Ampyrone was widely used as an antipyretic, and as an analgesic for rheumatism, neuritis and common colds, but replaced due to leucocytopaenia. Dipyrone has veterinary prescription in dogs and horses for mild surgical pain, colic, and fever in foals/ adults. Less often used for musculoskeletal pain. Significant potential to affect performance.
Amrinone

Inocor, Amrinone, Amrinone lactate

Banned

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Definition: Vasodilator

Information:

Amrinone is given intravenously or by bolus dose,as short-term treatment for congestive heart failure; action lasts 1/2 to 2hr (dose-dependent),half-life 5-8hr; 60% renal,20% faecal excretion. Not approved for animal use.
Amyl nitrate/nitrite

Amyl Nitrite Aspirols, Amyl Nitrite Vaporole, Nitrit, Amyl Nitrosum

Banned

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Definition: Angina treatment

Information:

Amyl nitrite inhalant preparations absorb through lung alveoli for rapid short action (30 seconds onset,lasts 3-5minutes) for angina. High doses cause methaemaglobinaemia. Tolerance develops, rapidly metabolised,renal excretion 1/3 inhaled dose. Not approved for animals.
Amylocaine

Amyleine

Banned

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Definition: Local anaesthetic

Information:

Amylocaine hydrochloride, originally called Stovaine, is mostly used in spinal anaesthesia; high potential to affect performance.
Anabolic Steroid Esters

Banned

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Definition: Anabolic

Information:

Steroid esters of any anabolic steroids listed are also Banned Substances
Anastrozole

Arimidex

Banned

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Definition: Aromatase inhibitor

Information:

Prescription-only Anastrozole products are first line treatment for post-menopausal breast cancer(mostly hormone-receptor positive), and for gynaecomastia in boys and prepubertal girls. Can reduce bone density.
Andarine

SARM S4, S4 Andarine

Banned

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Definition: Selective Androgen Receptor Modulator (SARM)

Information:

Andarine is a selective androgen receptor agonist and administration causes muscle growth resulting in increased muscle mass. Andarine was initially produced to treat muscle-wasting diseases.
Androstanolone

Banned

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Definition: Anabolic

Information:

An anabolic steroid with no legitimate therapeutic indication in the equine athlete.
Androstenediol

Neumune, Methandriol,5-AED

Banned

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Definition: Anabolic

Information:

5-Androstenediol was being developed for treatment of radiation sickness. 4-Androstenediol is abused for body-building. Both products have high potential for affecting performance.
Androstenedione

Oxandrolone, Oxandrin, Oxymetholone, Anadrol, Nandoral, Retarbolin, Laurabolin, Stanozolol, Winstrol

Banned

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Definition: Anabolic

Information:

Androstenedione is a Schedule III Controlled Substance in USA, banned world-wide from competitive use due to androgeic properties, which significantly affect performance. Therapeutically improves muscle strength and libido, and reduces gynaecomastia in older men. Several derivatives are licensed in veterinary medicine.
Androsterone

Banned

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Definition: Anabolic

Information:

A metabolite of testosterone and dihydrotestosterone (DHT) with no legitimate therapeutic indication in the equine athlete.
Anileridrine

Leritine, Adopol, Nipecotan

Banned

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Definition: Opiod analgesic

Information:

Anileridrine is licensed for medical or veterinary practitioner use as an analgesic, sedative. In pre-anaesthesia it produces relaxation, reduces laryngospasm, and reduces dose of general anaesthetic (like Meperidine, but respiratory depression lifts sooner).
Anilopam

Corlopam, Fenoldopam mesylate

Banned

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Definition: Central Nervous System stimulant

Information:

Licensed Anilopam-like compounds are used for hypertension, sedation, anti-depressant (stimulant) activity; specific action and potency varies with chemical groupings. All have high potential to affect performance.
Anisindione

Miradon

Banned

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Definition: Anticoagulant

Information:

Anisindione is prescribed for prophylaxis and/or treatment of venous thrombosis, pulmonary embolism, coronary occlusion and atrial fibrillation with embolism,especially if coumarin not tolerated. No accumulation; clotting activity returns 1-3 days. Not approved for animal use.
Anisotropine

Hyomax-SR, Lytispasm, Endovalpin,Valpin 50, Octatropine, Methyloctatropine bromide

Banned

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Definition: Anticholinergic

Information:

Anisotropine in high doses reduces gut secretion and motility and bladder, ureter, bile duct and gall bladder tone. Low doses reduce salivary, bronchial, sweat gland secretions, dilate pupils and increase heart rate. Aids peptic ulcer treatment; as premedicant, reduces saliva. Not licensed for animals.
Antazoline

Otrivine, Antistin

Banned

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Definition: Antihistamine

Information:

Antazoline (Phenazoline) in nose and eye drops gives temporary from of nasal congestion, allergic conjunctivitis, rhinitis, and dust mite allergy. Systemic absorption gives sympathomimetic effects: raised blood pressure and heart rate, arrhythmia, nervousness.

Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Antihistamines (class of drugs)

Conditionally Permitted

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Information:

Some drugs in this classification are considered prohibited and therefore NOT accepted with a Medications Report Form.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Antipyrine

Allergan, Aurodex, Auroto, Benzotic, Otoalgan, Pro-Otic, Propyphenazone

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

Analgesic and antipyretic, Antipyrine was combined with salicylate for relief of pain and fever, may still be used in some dental treatments. Found in many ear preparations for minor pain, itching and wax removal.
Apazone (Azapropazone)

Rheumox, Prolixan, Tolyprin

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

Azapropazone is prescribed to relieve pain of rheumatoid arthritis, ankylosing spondylitis and gout where other products fail. Good post-operative analgesic. May cause drowsiness, dizziness and gastric irritation. Plasma levels persist, showing biphasic fall; most excreted unchanged in urine. Not approved for animals.
Apocodeine

Trade names are not currently listed on this site.

Banned

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Definition: Opiod analgesic

Information:

Apocodeine has been used as an expectorant, hypnotic and cathartic, which is rapidly absorbed,active (10-20 minutes) and eliminated (half-life 30 minutes). May help Parkinsonism. Recent application for treatment of male impotence and stimulation of male/female libido.
Apomorphine

Apokyn, Apo-Go, Apomorphine

Banned

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Definition: Opiod analgesic

Information:

Apomorphine is used acutely in veterinary medicine to induce vomiting in small animals after poison ingestion. In human medicine it is used to treat muscle stiffness with Parkinsonism, poor control during 'wearing off' episodes and for low gut mobility. It also attenuates motor deficit after neurotoxin damage. Not approved for equine use.
Aprindine

Amidonal, Aspenon, Fibocil, Fiboran, Ritmusin

Banned

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Definition: Anti-arrhythmic

Information:

Aprindine is widely prescribed in Europe, North America and Japan for ventricular/supraventricular arrythmias, with nonlinear dose-dependent effects and excretion, largely unchanged, in urine. Not approved for animal use.
Aprobarbital

Alurate, Arbituric acid, Allylpropymal

Banned

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Definition: Sedative

Information:

Aprobarbital was primarily used for insomnia treatment, although less used than phenobarbital and now rare. Excretion through kidneys depends on urine flow and pH. Testing oral fluids would give higher reading than plasma.
Apronalide

Sedormid, Isodermid

Banned

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Definition: Sedative

Information:

Apronalide (Apronal) has long been available without prescription for insomnia and nervousness; significant potential to affect performance.
Arecoline

Arecholin, Arecaline, Arekolin, Piperidine alkaloid

Banned

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Definition: Stimulant

Information:

Arecoline was widely given as tapeworm treatment in dogs, but was largely superseded; it expels live worms. Still used for animal surveys and treatment in developing countries. Arecoline hydrobromide improves learning ability and helps verbal and spatial memory in Alzheimers disease (carcinogenic risk). Not approved for use in equines and prohibited by control bodies.
Arformoterol

COPD, Seprocor, Brovana, Foradil Aeriolizer, Formertorel

Conditionally Permitted

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Definition: Bronchodilator

Information:

Arformoterol nebularisers are used for maintenance treatment of chronic obstructive bronchial disease and emphysema to improve peak expiratory flow rates. Tolerance may develop, and also paradoxical bronchospasms. Mostly metabolised, excretion is by urine and faeces.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Argon

Banned

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Definition: Hypoxia Inducible Factor Activator

Information:

A noble gas that can be used in hypobaric chambers to produce hypoxia. It has no legitmate therapeutic indication in the equine athlete.
Arsenic

Trisenox, Caparsolate, Histostat, 3-nitro-roxarsone, Pro-Gen Plus, Roxarsone, Sodium Cacodylate solutions, Cocci-Bol-o-tab

Banned

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Definition: Stimulant/toxic

Information:

Arsenic may only be injected by experienced clinicians for treatment of acute or refractory leukaemia. Arsenamide sodium or thiacetarsenamide sodium is injected by licensed veterinary practitioners to treat heartworm in dogs. Other derivatives are used in swine and poultry feed mixes for improved weight gain, to help control disease (swine flu, blackhead). Added to cattle, sheep and horse supplements to aid convalescense, prevent or treat coccidiosis and enteric infection.

Arsenic is a Threshold Substance and a Specified Substance. Specified Substances should not in any way be considered less important or less dangerous than other Prohibited Substances. Rather, they are simply substances which are more likely to have been ingested by Horses for a purpose other than the enhancement of sport performance, for example, through a contaminated food substance.
Articaine

Septocaine, Septanest, Ubistesin,4%Articadent Dental, Deltazine, Bucanest, Septodont

Banned

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Definition: Local anaesthetic

Information:

Articaine is used world-wide, often in dental practice, for submucosal and regional nerve block injection. Most rapidly hydrolysed to low toxicity metabolite with renal excretion. Pain block precedes function loss.
Atenolol

Temormin, Tenif, Beta-Adalat, Co-Tenidone, Tenolin

Banned

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Definition: Beta blocker

Information:

Atenolol is prescribed in human and small animal veterinary medicine, often combined with other anti-hypertensive and/or diuretic agents, for additive anti-hypertensive effect. In animals it is used for cardiac arrhythmias, hypertrophic cardiomyopathy and obstructive cardiac disease. Doses above therapeutic levels have quinidine-like heart stabilising effect.
Atipamezole

Antisedan, Revertor

Conditionally Permitted

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Definition: Alpha adrenergic antagonist

Information:

Atipamezole may be used to reverse the effects of sedation.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Atomoxetine

Strattera, Recit

Banned

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Definition: Selective noradrenaline re-uptake inhibitor

Information:

Atomoxetine HCl improves attentiveness, reduces impulsiveness,and is prescribed for Attention Deficit Hyperactive Disorder (ADHD) treatment in adults only. Not major depressive disorders. Cytochrome enzyme deficiency prolongs plasma clearance; urinary (80%) and faecal excretion.
Atracurium

Atracurium, Atracurium Opopharma, Gelolagar, Tracurix, Tracuran, Tracrium

Banned

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Definition: Muscle relaxant

Information:

Inhibits neuro-muscular transmission and is used for muscle relaxation after surgical interventions.
Atropine

Atropine, Atro Ofteno, Atropen, Atropinum, Atropisa, Endotropina, Klonatropina

Conditionally Permitted

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Definition: Anticholinergic

Information:

Atropin may be used in the treatment of uveitis and have anti-spasmodic effects.

Atropine is a Specified Substance. Specified Substances should not in any way be considered less important or less dangerous than other Prohibited Substances. Rather, they are simply substances which are more likely to have been ingested by Horses for a purpose other than the enhancement of sport performance, for example, through a contaminated food substance.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Azacyclonal

Azacyclonol, Frenquel

Banned

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Definition: Antipsychotic

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Azaperone

Eucalmyl, Fluoperidol, Sedaperone Vet, Stresnil, Suicalm

Banned

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Definition: Sedative

Information:

Azaperone is mainly used as a tranquiliser. It may cause hypotension.
Azapetine

Ilidar

Banned

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Definition: Vasodilator

Information:

Azapetine has an alpha-adrenoceptor blocking effect.
Azapropazone (Apazone)

Cinnamin, Pentosol, Debelex, Prolix, Prolixan, Prolixana, Rheumox, Tolyprin, Sinnamin, Tulyprin, Xani

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

Azapropazone has analgesic, anti-inflammatory, and antipyretic effects. It is mainly used in various rheumatic disorders.
Azatadine

Azatadine, Idulamine, Idulian, Lergocil, Optimine, Trinalin, Verbén, Zadine

Banned

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Definition: Antihistamine

Information:

It has anti-muscarinic and anti-serotonin properties, and acts for a long duration.

Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Azathioprine

Azamun, Azarek, Azathioprine, Azopi, Imuprin, Satedon, Zytrim

Conditionally Permitted

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Definition: Immunosuppressant

Information:

Azathioprine may be used to suppress the immune system.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Azosemide

Banned

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Definition: Diuretic

Information:

A loop diuretic with no legitimate therapeutic indication in the equine athlete
Baclofen

Lioresal

Banned

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Definition: Antispasmodic

Information:

Used for the symptomatic relief of muscular spasms caused by conditions such as multiple sclerosis.
Bambuterol

Bambec, Bambudil, Oxeol

Banned

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Definition: Bronchodilator

Information:

It is a Terbutaline pro-drug.
Bamifylline

Airest, Bamifix, Bami-Med, Bamixol, Briofil, Trentadil

Banned

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Definition: Bronchodilator

Information:

It relaxes smooth muscles, relieves bronchospasms, and has a stimulant effect on respiration.
Barbital

Deba, Diemal, Diemalum, Dormonal, Hypnogene, Malonal, Sedeval, Uronal, Veroletten, Verolettin, Veronal, Vesperal

Banned

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Definition: Sedative

Information:

Used as sedative and hypnotic, especially in its soluble salt form, sodium barbital.
Beclamide

Hibicon, Neuracen, Nydrane, Posedrine, Seclar

Banned

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Definition: Sedative

Information:

It is used for the control of tonic-clonic seizures and psychomotor epilepsy, and for the management of behaviour disorders.
Beclomethasone

Airbeclosona, Beclacin, Beclometason, Becloval, Clenil-A, Easyhaler Beclometasone, Entyderma, Inalone, Korbutone

Conditionally Permitted

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Definition: Corticosteroid

Information:

Beclomethasone is used for the management of asthma, and treatment of rhinitis and sinusitis.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Bemegride

Agipnon, Ahypnon, Antibarbi, Benegrid, Eukraton, Malysol, Megibal, Megimid, Megimide, Mikedimide, Zentraleptin

Banned

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Definition: Stimulant

Information:

It is used as an anorectic, and has a marked stimulant effect on the central nervous system, particularly on the cerebral cortex.
Benactyzine

Alin, Lucidex, Deprol

Banned

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Definition: Anticholinergic

Information:

It is used as a hydrocholride in the management of psychoneurotic disorders.
Benapryzine

Brizin

Banned

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Definition: Anticholinergic

Information:

It has been used in the treatment of Parkinson's disease.
Benazepril

Apo-Benazepril, Benace, Benazepril, Boncordin, Briem, Cibace, Cibacen, Cibacene, Fortekor, Lotensin, Lotrel, Tensanil, Zinadril

Banned

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Definition: Antihypertensive

Information:

Benazepril is an anti-hypertensive. It has been rarely used in horses. Benazepril is considered a Class 3A drug by the International Association of Racing Commissioners.
Bendroflumethazide

Aprinox, Neo-NaClex

Banned

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Definition: Diuretic

Information:

It is used to treat hypertension and oedema in humans, dogs, cats and horses.
Benorilate

Benorilate

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

It is used as an anti-inflammatory and antipyretic medication.
Benoxaprofen

Oraflex, Opren

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

It is not commonly used in human or veterinary medicine due to adverse side effects.
Benoxinate

Minims Benoxinate, Fluress, Opulets Benoxinate, Prescaina, Novesina, Novesin

Banned

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Definition: Local anaesthetic

Information:

It is used in applanation tonometry and for fitting contact lenses.
Benperidol

Anquil, Benquil, Concilium, Frenactil, Frenactyl, Glianimon, Glianimon Mite, Psicoben

Banned

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Definition: Antipsychotic

Information:

It is used as an anti-psychotic drug to treat antisocial, hypersexual behaviour caused by mental illness. It is also used in the treatment of schizophrenia.
Bentazepam

Tiadipona

Banned

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Definition: Anxiolytic

Information:

Bentazepam is an anxiolytic. It is also known as thiadipone. It has anticonvulsant, sedative and skeletal muscle relaxant properties, as well as anxiolytic.
Benzocaine (Ethyl Aminobenzoate)

Americaine, Anaestherit, Anbesol, Capacol, Numzident, Orajel, SensoGARD, Sirop Dentition, Slim Mint, Topicaine, Zilabrace

Conditionally Permitted

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Definition: Local anaesthetic

Information:

Benzocaine is used for the temporary local relief of pain.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Benzoctamine

Tacitin

Banned

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Definition: Sedative

Information:

It can be used as a sedative for patients with respiratory failure.
Benzonatate

Tessalon Perles, Tessalon capsules

Banned

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Definition: Antitussive

Information:

Used in humans to prevent or relieve minor coughing, and used in small doses for mouth or pharyngeal pain.
Benzoylecgonine

Esterom

Banned

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Definition: Stimulant/cocaine metabolite

Information:

Main pharmaceutical ingredient in 'Esterom'" - a prescription drug used topically for relief of muscle spasm and pain."
Benzphetamine

Didrex

Banned

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Definition: Stimulant

Information:

Used in humans to decrease appetite. It is a schedule III drug in the USA.
Benzquinamide

Emeticon, Promecon, Quantril, Quantryl

Banned

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Definition: Antihistamine

Information:

Antihistamine, anti-emetic,mild anticholinergic and a sedative. Benzquinamide antagonises muscarinic acetylcholine receptors and histamine H1 receptors.

Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Benzthiazide

Dytide, Dyrenium Compositum

Banned

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Definition: Diuretic

Information:

It was used in humans to treat high blood pressure and oedema, however is no longer available in the US.
Benztropine

Cogentin

Banned

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Definition: Anticholinergic

Information:

It is used to treat Parkinson's disease and idiopathic or secondary dystonia.
Benzydamine

Tantum Verde, Difflam, Benflogin, Androlex, Androlex-C

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

It is used topically to treat mouth ulcers.
Benzylpiperazine

Trade names are not currently listed on this site.

Banned

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Definition: Stimulant

Information:

It is used by humans as a recreational drug for its euphoric and stimulant properties. It is illegal in the United States, Australia, New Zealand, Ireland and some parts of Europe. This is a substance deemed to have no legitimate use in equine medicine.
Bepridil

Vascor, Bepadin

Banned

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Definition: Calcium channel blocker

Information:

It was used in humans to treat angina but now not commonly used due to possibly inducing arrhythmias. It only has a mild potential to affect perfomance.
Betamethasone

Bebyderm, Becort, Bedifos, Betacorlan, Betacortril, Betafoam, Betagen, Betamamallet, Betamethason, Betapred, Betasolon, Betnasol, Betsolan, Celestamine N, Celestene, Celestone, Cevicort, Coritex, Cortimar, Flubenisolone, Hormezon, Konicortil, Luxiqo, Medobeta, Methazon, Steromien

Conditionally Permitted

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Definition: Corticosteroid

Information:

Betamethasone is used as an anti-inflammatory and anti-allergic agent for the treatment of dermatological, rheumatic and allergic diseases.

The detection time is estimated with 168 hours (7 days) for intra articular administration. Please remember: A detection time is not the same as a withdrawal time. The detection time is the approximate period of time for which a substance (or its metabolite) remains in a horse's system such that it can be detected by the laboratory. The withdrawal time for a substance adds a safety margin, chosen with professional judgment and discretion to allow for individual differences between horses such as size, metabolism, degree of fitness, recent illness or disease etc. You are advised to seek suitable advice from your treating veterinarian.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Betaprodine

Prisilidine, Nisentil

Banned

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Definition: Opiod analgesic

Information:

Betaprodine was not developed for medicinal use. As an opioid analgesic, betaprodine would have a high potential to affect performance.
Betaxolol

Betoptic, Betoptic S, Lokren, Kerlone

Banned

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Definition: Beta blocker

Information:

It is used topically to treat glaucoma and is approved by the US Food and Drug Administration for ocular use as a 0.5% solution. Also used to treat hypertension. Has a mild potential to affect athletic performance.
Bethanechol

Duvoid, Myotonachol, Urecholine

Conditionally Permitted

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Definition: Parasympathomimetic

Information:

Bethanechol may be used in the treatment of urinary retention.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Bethanidine

Batel, Benzoxine, Betaling, Bethanid, Esbatal, Eusmanid, Hypersin

Banned

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Definition: Antihypertensive

Information:

It is used to treat hypertension. Bethanidine has the potential to affect performance.
Biperiden

Akineton, Akinophyl, Bikipen, Darcipireno, Roloken, Sinekin

Banned

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Definition: Anticholinergic

Information:

It is used to treat Parkinson's disease.
Biphenamine

Biphenamine hydrochloride, Salol, Sébaklen

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

It is used for treatment of inflammed eyes in humans, and also used in treatment of seborrhea capitis. Potential to affect horse performance is not known.
Biriperone

Trade names are not currently listed on this site.

Banned

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Definition: Antipsychotic

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Bisoprolol

Bisoprolol, Cardicor, Emcor, Fondril, Vivacor

Banned

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Definition: Beta blocker

Information:

It is used to treat moderate to severe heart failure. Bisoprolol will give a positive result in doping tests in human athletes.
Bitolterol

Tornalate, Bitolterol

Banned

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Definition: Bronchodilator

Information:

It is used in treatment of bronchospasms in humans, in conditions including asthma and chronic obstructive pulmonary disease. It has a rapid onset action,and may last up to 6-8 hours.
Bolandiol

Anabiol

Banned

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Definition: Anabolic

Information:

It is used as a 'body building'" supplement and it is included in the UK Misuse of Drugs Act - Part III Class C. It has performance enhancing qualities and is not approved for use with horses."
Bolasterone

Myagen

Banned

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Definition: Anabolic

Information:

It was originally used as an oral steroid by body builders in Europe.
Boldenone

Equipoise, Ganabol, Equigan, Ultragan

Banned

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Definition: Anabolic

Information:

It has been used in the treatment of horses (originally designed for veterinary use)
Boldione

Trade names are not currently listed on this site.

Banned

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Definition: Anabolic

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Bretylium

Darenthin, Darentin, Ornid

Banned

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Definition: Anti-arrhythmic

Information:

It should only be used in hospital intensive care units due to the potential side effects.
Brimonidine

Alphagan, Apo-Brimonidine, Enidin, Oftalmotonil

Banned

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Definition: Occular antihypertensive

Information:

It is used for lowering intraocular pressure.
Brinzolamide

Azopt, Azoptic

Conditionally Permitted

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Definition: Diuretic

Information:

Brinzolamide may be used to reduce intraocular pressure in the treatment of glaucoma.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Bromantan

Trade names are not currently listed on this site.

Banned

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Definition: Stimulant

Information:

Developed by the former Soviet Union for use by the armed forces. Will affect performance of athletes.
Bromazepam

Lexotan, Brazepam, Bromaze, Lectopam

Banned

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Definition: Anxiolytic

Information:

It is used in the treatment of anxiety and insomnia.
Bromfenac

Bronuck, Duract, Xibrom

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

Available in an ophthalmic solution.
Bromhexine

Brometix, Bromexidryl, Bronacim, Broncocalmine, Brondilax, Catarrosine, Clarus, Dibroxin, Expectosan Extra Forte, Flumed, Funciobron B, Inquixol, Lisi-Tos, Lubrirhin, Namir, Pectoral Pagliano, Tolmix, Toridran-N, Toscalmin, Tostop

Conditionally Permitted

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Definition: Mucolytic

Information:

Bromhexine may be used in the treatment of respiratory disease.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Bromisovalum

Corvalol

Banned

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Definition: Sedative

Information:

It is imported from Russia, and is an unapproved drug.
Bromocriptine

Parlodel

Banned

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Definition: Dopamine agonist

Information:

It is used in dogs for abortion, and in horses for treatment of pseudopregnancy and pituitary-dependent hyperadrenocorticism. It has a high potential to affect athletic performance.
Bromodiphenhydramine

Amodryl, Bromanautine, Bromo-Benadryl, Bromo-Benzdryl, Deserol, Histabromamine, Neo-Benadryl

Banned

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Definition: Antihistamine

Information:

It is used to manage symptoms related to allergies.

Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Bromophenethylamine

4-Bromophenethylamine

Banned

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Definition: Psychedelic

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Bromperidol

Bromidol, Impromen, Tesoprel

Banned

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Definition: Antipsychotic

Information:

It is used in human medicine for the treatment of schizophrenia.
Brompheniramine

Bromfed, Dimetapp, Bromfenex, Dimetane

Conditionally Permitted

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Definition: Antihistamine

Information:

Brompheniramine may be used in the control of allergies.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Brotizolam

Bondormin, Brotizolam, Dormex, Indormyl, Ladormin, Lendorm, Lendormin, Lendormine, Lindormin, Maderantil, Nimbisan, Noctilan, Sintonal

Banned

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Definition: Anxiolytic

Information:

It is used in the treatment of insomnia. It is approved for sale in the Netherlands, Germany, Portugal, Italy and Japan, but not in the UK, USA or Canada.
Bucetin

Betadid

Banned

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Definition: Analgesic/antipyretic

Information:

It is an analogue of Phenacetin and has been withdrawn from the market.
Buclizine

Aphilan R, Bucladin, Longifene, Migraleve, Postafen

Banned

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Definition: Antihistamine

Information:

It is used in combination with two other drugs to treat migraines. Its affect on athletic performance is not known.

Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Budesonide

Rhinocort, Pulmicort, Entocort, Noex

Conditionally Permitted

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Definition: Corticosteroid

Information:

Budesonide is used to treat non-infectious rhinitis and nasal polyps.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Bufexamac

Allergipuran N, Droxaryl, Duradermal, Ekzemase, Malipuran, Parfenac, Viafen

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

It is used for joint and muscle pain.
Buflomedil

Bufedil, Buflan, Defluina, Flomed, Fonzylane, Irrodan, Lofton, Loftyl, Sinoxis

Banned

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Definition: Vasoactive agent

Information:

It is used in the treatment of peripheral arterial diseases.
Bufotenine

Trade names are not currently listed on this site.

Banned

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Definition: Naturally occurring hallucinogen

Information:

Found in the skin of some species (toads) and in mushrooms. Used for psychedelic effects in recreational circumstances.

Bufotenine is a Specified Substance. Specified Substances should not in any way be considered less important or less dangerous than other Prohibited Substances. Rather, they are simply substances which are more likely to have been ingested by Horses for a purpose other than the enhancement of sport performance, for example, through a contaminated food substance.
Bumetanide

Aquazone, Bumex, Burinex, Butinat, Cambiex, Diurama, Farmadiuril, Fontego, Fordiuran, Lunetoron

Banned

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Definition: Diuretic

Information:

Used to treat heart failure, but also used to mask other drugs and/or steroids by diluting urine.
Bunitrolol

Betrilol, Stresson

Banned

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Definition: Beta adrenergic antagonist

Information:

It has similar properties to those of Propranolol.
Bunolol

Ophtho-Bunolol

Banned

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Definition: Beta blocker

Information:

Beta blocker which is therefore an antihypertensive agent.
Buphenine (Nylidrin)

Arlibide, Arlidin, Diatolil, Dilatol, Dilydrin, Dilydrine Retard, Opino, Penitardon, Perdilatal Forte, Tocodilydrin, Tocodrine

Banned

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Definition: Sympathomimetic

Information:

Sympathomimetic and beta-adrenergic agonist. It causes peripheral vasodilation and has a positive ionotropic effect. It may affect performance.
Bupivacaine

Bupivacaine, Carbostesin, Duracaina, Marcaine, Sensorcaine

Conditionally Permitted

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Definition: Local anaesthetic

Information:

Bupivacaine is used for the temporary local relief of pain.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Bupranolol

Betadrenol, Ophtorenin

Banned

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Definition: Beta blocker

Information:

It has similar properties to those of Propanolol.
Buprenorphine

Buprenex, Buprenorphine, Finibron, Prefin, Temgesic

Conditionally Permitted

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Definition: Opioid

Information:

Buprenorphine may be used to relieve pain

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Bupropion

Wellbutrin

Banned

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Definition: Antidepressant

Information:

An antidepressant which acts by inhibiting re-uptake of norepinephrine and dopamine and blocks nicotinic receptors. The structure of the metabolites closely resembles amphetamine, therefore may cause false positive amphetamine urine tests.
Buspirone

Ansial, Ansiced, Anxiolan, Axoren, BuSpar, Buspirone, Loxapin, Pasrin, Tendan

Banned

Click to expand

Definition: Anxiolytic

Information:

Anxiolytic and antidepressant. It works by partially blocking serotonin 5-hydroxatryptamine receptors.
Butabarbital

Buticaps, Butisol, Ciprial, Mebutal, Paxital, Prelital

Banned

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Definition: Sedative

Information:

Rarely used in human medicine, but is for the treatment of severe insomnia and relieving anxiety.
Butacaine

Bal, Relaxoddi

Banned

Click to expand

Definition: Local anaesthetic

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Butalbital

Axocet, Fioricet, Axotal, Fiorinal

Banned

Click to expand

Definition: Sedative

Information:

It is commonly used in combination, usually with paracetamol or aspirin, for the treatment of pain and headaches.
Butamben

Butamben, Homeodose, Nestosyl, Prurex, Topicaina

Banned

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Definition: Nerve blocker

Information:

Used for surface anaesthesia.
Butanilicaine

Hostacain

Banned

Click to expand

Definition: Local anaesthetic

Information:

Local anaesthetic. Listed in the Association of Racing Commissioners (USA) as having a high potential to affect performance.
Butaperazine

Emerex, Megalectil, Randolectil, Repoise

Banned

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Definition: Antipsychotic

Information:

No recognised use in the veterinary market.
Butoctamide

Listomin

Banned

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Definition: Serotonin release stimulation

Information:

No known use in veterinary medicine. Used in human medicine to treat insomnia, manic-depressive illness and schizophrenia.
Butofilolol

Cafide

Banned

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Definition: Beta blocker

Information:

It has similiar properties to those of Propanolol and is used in the management of hypertension.
Butorphanol

Beforal, Butorphanol, Butrum, Moradol, Stadol, Torbugesic, Torbutrol, Verstadol

Conditionally Permitted

Click to expand

Definition: Opioid

Information:

Butorphanol may be used to relieve pain and in anaesthetic premedication.

The detection time is estimated at 72 hours (3 days) following intravenous administration.

A detection time is not the same as a withdrawal time. The detection time is the approximate period of time for which a substance (or its metabolite) remains in a horse's system such that it can be detected by the laboratory. The withdrawal time for a substance adds a safety margin, chosen with professional judgement and discretion to allow for individual differences between horses such as size, metabolism, degree of fitness, recent illness or disease etc. You are advised to seek suitable advice from your treating veterinarian).

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Butoxycaine

Stadacain

Banned

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Definition: Local anaesthetic

Information:

It is used in human medicine for mucosal analgesia in urology.
Butylscopolamine

Buscopan

Conditionally Permitted

Click to expand

Definition: Anticholinergic

Information:

Butylscopolamine may be used to treat spasms within the digestive tract.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Cafedrine

Akrinor, Bifort, Praxinor

Banned

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Definition: Analeptic

Information:

It is used to increase the blood pressure of people with low blood pressure.
Caffeine

Horse Power X, Exceed

Banned

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Definition: Stimulant

Information:

Caffeine may stimulate the central nervous system and cardiac muscle

Caffeine is a Specified Substance. Specified Substances should not in any way be considered less important or less dangerous than other Prohibited Substances. Rather, they are simply substances which are more likely to have been ingested by Horses for a purpose other than the enhancement of sport performance, for example, through a contaminated food substance.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Calcium Dobesilate

Dexium, Dobesifar, Doxium

Conditionally Permitted

Click to expand

Definition: Vasoprotective

Information:

Calcium dobesilate may be used in the treatment of orthpaedic disease.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Calusterone

Methosorb

Banned

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Definition: Anabolic

Information:

Originally tested in people with breast cancer, however more recent research found no advantages, and it is not commonly used. Only recognised as having a small potential to affect athletic performance.
Camazepam

Paxor, Albego, Limpidon

Banned

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Definition: Anxiolytic

Information:

It has anxiolytic, anticonvulsant, sedative and skeletal muscle relaxant properties.
Canagliflozin

Invokana

Conditionally Permitted

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Definition: Anti-hyperglycaemic

Information:

Canagliflozin may be used in the treatment of equine metabolic syndrome.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Candesartan

Amias, Atcand, Ratacand, Blopress

Banned

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Definition: Antihypertensive

Information:

It is used in humans with hypertension and heart failure.
Cannabidiol (CBD, CBDA)

Epidiolex, Epidyolex

Banned

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Definition: Cannabinoid

Information:

Cannabidiol (CBD, CBDA) may be used in the control of pain and neurological disorders.

Cannabidiol (CBD, CBDA) is a Specified Substance. Specified Substances should not in any way be considered less important or less dangerous than other Prohibited Substances. Rather, they are simply substances which are more likely to have been ingested by Horses for a purpose other than the enhancement of sport performance, for example, through a contaminated food substance.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Cannabis - natural cannabinoids (except for cannabidiol), synthetic cannabinoids and other cannabimimetcs

Sativex, Marinol, Cesamet

Banned

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Definition: Psychotropic

Information:

Used illegally by people for recreation. Is available under prescription for its analgesic properties in some countries. Natural cannabinoids, synthetic cannabinoids and other cannabimimetics are Specified Substance. Specified Substances should not in any way be considered less important or less dangerous than other Prohibited Substances. Rather, they are simply substances which are more likely to have been ingested by Horses for a purpose other than the enhancement of sport performance, for example, through a contaminated food substance.
Canrenone

Inspra

Banned

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Definition: Diuretic

Information:

It is used in human medicine as a treatment for arterial hypertension and congestive heart failure.
Capsaicin

Axsain, Benejoint, Capsaicin, Capsicin, Capsig, Dolorac, Hansaterm, Theragen, Zostrix

Banned

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Definition: Topical analgesic/irritant

Information:

It is used as a neuropharmacological tool in topical ointments for pain relief. It has also hypersensitizing properties.
Captodiame

Covatine, Covatix

Banned

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Definition: Anxiolytic

Information:

It is used for the treatment of anxiety and tension.
Captopril

Capoten, Capolen

Conditionally Permitted

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Definition: Angiotensin-converting enzyme inhibitor

Information:

Captopril may be used to treat hypertension and heart failure.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Caramiphen

Ordrine AT, Rescaps-D, Tuss Vernade

Banned

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Definition: Anticholinergic

Information:

It is used to treat the common cold in humans.
Carazolol

Carbacel, Conducton

Banned

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Definition: Beta blocker

Information:

It has similar properties to those of Propanolol and is used in the treatment of hypertension.
Carbachol

Doryl, Carbastat, Carboptic, Miostat

Banned

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Definition: Parasympathomimetic

Information:

It is used to lower intraocular pressure.
Carbamazepine

Tegretol, Biston

Conditionally Permitted

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Definition: Anticonvulsant

Information:

Carbamazepine may be used in the control of headshaking.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Carbazochrome

Adrenoplasma, Adrenoxil, Adrenoxyl, Adrezon, Cromoxin, Siochrome Injections, Styptocid Injections

Banned

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Definition: Haemostatic

Information:

It is used in the treatment of hemorrhoids.
Carbetapentane (Pentoxyverine)

Balsoclase, Germapect, Merol, Pectosan Toux Seche, Sirop Pectoral Vicks, Toclase Toux Seche, Tussa-Tablinen, Vicks Pectoral

Banned

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Definition: Antitussive

Information:

It is used to relieve sneezing/rhinitis in humans.
Carbidopa

Lodosyn, Sinemet

Banned

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Definition: Di hydroxythenylalanine decarboxylase inhibitor

Information:

Carbidopa is used to inhibit peripheral metabolism of levodopa in the treatment of Parkinson's disease.
Carbimazole

Athyromazole, Basolest, Camazol, Carbimazol, Carbistad, Cazole, Neo-Mercazole, NeoMercazole, Neo-Morphazole, Neo-Tireol, Neo Tomizol

Banned

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Definition: Antihyperthyroidism

Information:

It is used to treat hyperthyroidism.
Carbinoxamine

Clistin, Palgic

Banned

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Definition: Antihistamine

Information:

It is used in humans to treat hay fever.

Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Carbon Dioxide (CO2)

Conditionally Permitted

Click to expand

Definition: Inorganic Compound

Information:

Carbon dioxide may be used in the treatment of metabolic disorders and wounds.

Carbon dioxide is a Threshold Substance.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Carbromal

Adalin, Diacid, Mirfudorm

Banned

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Definition: Sedative

Information:

Sedative/hypnotic. It has a high potential to affect athletic performance and its use is prohibited in athletic sport.
Carbuterol

Broncotrate, Bronsecur, Dynavent, Pirem, Rispran

Banned

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Definition: Bronchodilator

Information:

A beta2-adrenergic receptor agonist Bronchodilator. It may affect performance.
Carfentanil

Wildnil

Banned

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Definition: Opiod analgesic

Information:

No generally accepted medical use.
Carisoprodol

Soma-tabs

Banned

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Carphedon (Phenylpiracetam)

Phenotropil

Banned

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Definition: Stimulant

Information:

It is used to improve encephalopathic conditions and to increase physical stamina, as well as tolerance to cold.
Carphenazine

Procethazine, Proketazin, Proketazine

Banned

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Definition: Antipsychotic

Information:

Used in the treatment of acute or chronic schizophrenic reactions in hospitalised patients.
Carpipramine

Prazinil, Defekton

Banned

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Definition: Anxiolytic

Information:

This drug is indicated for the treatment of schizophrenia.
Carprofen

Imadyl, Rimadyl

Conditionally Permitted

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Definition: Non-steroidal anti-inflammatory

Information:

Carprofen may be used to relieve pain and inflammation.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Carteolol

Cartrol, Ocupress, Teoptic, Arteolol, Arteoptic, Calte, Cartéabak, Carteol, Cartéol, Cartrol, Elebloc, Endak, Glauteolol, Mikelan, Poenglaucol, Singlauc

Banned

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Definition: Beta blocker

Information:

It is used to treat glaucoma in humans.
Carticaine

Articaine, Septocaine, Ultracaine

Banned

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Definition: Local anaesthetic

Information:

Articaine is a dental local anaesthetic. It is the most widely used local anaesthetic in a number of European countries, and is available in many countries around the world.
Carvedilol

Coreg, Dilatrend, Eucardic, Carloc, Coreg CR

Banned

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Definition: Beta blocker

Information:

It is indicated in the treatment of mild to moderate congestive heart failure (CHF) in humans.
Cathine (Norpseudoephedrine)

Amorphan, Appetrol, Dietene, Miniscap, Nobese, Thinz

Banned

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Definition: Stimulant

Information:

It is used as an anorectic agent and to reduce appetite.
CBD (Cannabidiol; CBDA)

Banned

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Definition: Cannabinoid

Information:

CBD (Cannabidiol; CBDA) may be used in the control of pain and neurological disorders.

CBD (Cannabidiol; CBDA) is a Specified Substance. Specified Substances should not in any way be considered less important or less dangerous than other Prohibited Substances. Rather, they are simply substances which are more likely to have been ingested by Horses for a purpose other than the enhancement of sport performance, for example, through a contaminated food substance.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
CBDA (CBD; Cannabidiol)

Banned

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Definition: Cannabinoid

Information:

CBDA (Cannabidiol; CBD) may be used in the control of pain and neurological disorders.

CBDA (Cannabidiol; CBD) is a Specified Substance. Specified Substances should not in any way be considered less important or less dangerous than other Prohibited Substances. Rather, they are simply substances which are more likely to have been ingested by Horses for a purpose other than the enhancement of sport performance, for example, through a contaminated food substance.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Celecoxib

Celebrex, Celebra, Onsenal

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

It is used in the treatment of osteoarthritis, rheumatoid arthritis, acute pain, painful menstruation and menstrual symptoms. It is also used to reduce numbers of colon and rectum polyps in patients with familial adenomatous polyposis.
Celiprolol

Cardem, Celectol, Celipres, Celipro, Celol, Cordiax, Dilanorm, Selectol

Banned

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Definition: Beta blocker

Information:

It is used in the treatment of high blood pressure in human medicine.
Cephaeline

Ipecac

Banned

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Definition: Emetic

Information:

It is used as an alkaloid to induce vomiting.
Ceterizine (Cetirizine)

Cetryn, Hitrizin, Setir, Virlix, Ziptek, Zirtek, Zyrlex, Zyrtec

Conditionally Permitted

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Definition: Antihistamine

Information:

Ceterizine may be used in the control of allergies and is the active metabolite of hydroxyzine.

The detection time is estimated at 96 hours (4 days) following oral administration.

A detection time is not the same as a withdrawal time. The detection time is the approximate period of time for which a substance (or its metabolite) remains in a horse's system such that it can be detected by the laboratory. The withdrawal time for a substance adds a safety margin, chosen with professional judgement and discretion to allow for individual differences between horses such as size, metabolism, degree of fitness, recent illness or disease etc. You are advised to seek suitable advice from your treating veterinarian.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Cetirizine (Ceterizine)

Cetryn, Hitrizin, Setir, Virlix, Ziptek, Zirtek, Zyrlex, Zyrtec

Conditionally Permitted

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Definition: Antihistamine

Information:

Cetirizine may be used in the control of allergies and is the active metabolite of hydroxyzine.

The detection time is estimated at 96 hours (4 days) following oral administration.

A detection time is not the same as a withdrawal time. The detection time is the approximate period of time for which a substance (or its metabolite) remains in a horse's system such that it can be detected by the laboratory. The withdrawal time for a substance adds a safety margin, chosen with professional judgement and discretion to allow for individual differences between horses such as size, metabolism, degree of fitness, recent illness or disease etc. You are advised to seek suitable advice from your treating veterinarian.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Chloral betaine

Beta-Chlor, Welldorm

Banned

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Definition: Sedative

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Chloral hydrate

Aquachloral, Chloradorm, Chloraldurat, Chloralex, Chloralvan, Dormel, Equithesin, Novo-Chlorhydrate, Rectules

Banned

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Definition: Sedative

Information:

It was used for the short-term treatment of insomnia, and as a sedative before minor medical or dental treatment. Used as an ingredient in the veterinary anaesthetic Equithesin. Equithesin was effectively administered intra-venously, and for many years was the most commonly used injectable anaesthetic in horses.
Chloralbutanol

Trade names are not currently listed on this site.

Banned

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Definition: Topical analgesic

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Chlorcyclizine

Alergicide, Di-Paralen, Diparalene, Eramide, Histantine, Perazil, Perazyl, Piparalene

Banned

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Definition: Antihistamine

Information:

Used in treatment of motion sickness.

Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Chlordiazepoxide

Klopoxid, Librax, Libritabs, Librium, Mesural, Multum, Novapam, Risolid, Silibrin, Sonimen, Tropium, Zetran

Banned

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Definition: Anxiolytic

Information:

A sedative/hypnotic drug and benzodiazepine derivative. Chlordiazepoxide has a medium to long half-life, but its active metabolite has a very long half-life. The drug has amnestic, anxiolytic, hypnotic and skeletal muscle relaxant properties.
Chlormadinone acetate

Banned

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Definition: Hormone - progestagen

Information:

Clordion, Gestafortin, Lormin, Non-Ovlon, Normenon, Verton
Chlormerodrin

Chlormerodrin HG 197, Diurone, Katonil, Mercardox, Mercloran, Mercoral, Merculest, Merilid, Neogidrin, Neohydrin, Oricur, Promeran, Promerane

Banned

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Definition: Diuretic

Information:

Radiolabelled form has been used as a diagnostic and research tool.
Chlormethiazole

Distraneurin, Hemineurin, Heminevrin

Banned

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Definition: Sedative

Information:

It is used in the treatment of confusion, agitation, restlessness, sleeping disorders, and in the treatment of acute alcohol and drug withdrawal symptoms.
Chlormezanone

Alinam, Fenarol, Lyseen New, Miorilax, Myoflex, Trancopal, Tranrilax

Banned

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Definition: Anxiolytic

Information:

Its use was discontinued in many countries in 1996, due to rare, but serious cases of toxic epidermal necrolysis.
Chloroform

Freon 20, Esoform Alcolico, Esoform, Freezex Hoof Freeze, Sekumatic, Stom-Antiba, Stomyteol, Vicks Acta Plus

Banned

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Definition: Sedative

Information:

It was mainly used as an anaesthetic. It depresses a patient's central nervous system, causing dizziness, fatigue and unconsciousness. It is not routinely used in modern medicine.
Chlorophenesin

Adermykon, Demykon, Gechophen, Maolate, Mycil

Banned

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Definition: Muscle relaxant

Information:

It has also been used in topical applications approved by the World Health Organisation due to some antibacterial and antifungal properties.
Chlorophenyl piperazine

Trade names are not currently listed on this site.

Banned

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Definition: Psychoactive

Information:

It has been detected in pills touted as legal alternatives to illicit stimulants in New Zealand, and pills sold as ecstasy in Europe and the United States. It is illegal.
Chloroprocaine

Nesacaine, Nesacaine-MPF

Banned

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Definition: Local anaesthetic

Information:

It is given by injection during surgical procedures, and during labour and delivery in human medicine.
Chloropyramine

Avapena, Allergan S, Anaphylline, Nilfan, Sinopen, Suprastin, Synopen, Synopen R, Synpen

Banned

Click to expand

Definition: Antihistamine

Information:

Approved in some Eastern European countries for the treatment of allergic conjunctivitis, allergic rhinitis, bronchial asthma, and other atopic (allergic) conditions.

Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Chloroquine

Avlochlor, Chloroin, Resorchin, Sanoquin, Trochin

Banned

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Definition: Antimalarial

Information:

It is used in the treatment or prevention of malaria.
Chlorothiazide (Chlorthiazide)

Azide, Chlotride, Diuril Boluses, Flumen, Lyovac Diuril, Saluretil, Saluric, SK-Chlorothiazide

Conditionally Permitted

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Definition: Diuretic

Information:

Chlorothiazide (chlorothiazide) may be used in the control of hypotension and oedema.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Chlorpheniramine

Alerdil, Allergex, Allergican, Apomin, Chlor-Trimeton, Chlorphen-12, Chloropiril, Chlorphenamine, Hayleve, Methyrit, Piriton, Prodel, Teldrin Allergy

Conditionally Permitted

Click to expand

Definition: Antihistamine

Information:

Chlorpheniramine may be used in the control of allergies.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Chlorphenoxamine

Clorevan, Spirbon, Systral, Systrason, Ultratussin

Banned

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Definition: Antipruritic

Information:

It is used in the treatment of idiopathic, arteriosclerotic, and postencephalitic Parkinsonism, usually with the concomitant administration of other anti-Parkinsonian agents.
Chlorphentermine

Apsedon, Desopimon, Lucofen

Banned

Click to expand

Definition: Stimulant

Information:

Stimulant drug used as an appetite suppressant. It is a relatively weak stimulant, which little potential for abuse.
Chlorproethazine

Neuriplege

Banned

Click to expand

Definition: Antihistamine

Information:

Antihistamine, antipsychotic and skeletal muscle relaxant.

Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Chlorpromazine

Thorazine, Largactil

Banned

Click to expand

Definition: Sedative

Information:

It effectively treats schizophrenia, severe mania in people with bipolar disorder, and uncontrollable hiccups.
Chlorpropamide

Bioglumin, Chloronase, Clordiabet, Diabemide, Diabenal, Diabet, Diabines, Diabinese, Gliconorm, Glucamide, Glymese, Hypomide, Insulase, Millinese, Normoglic, Novo-Propamide, Stabinol

Banned

Click to expand

Definition: Antidiabetic

Information:

It is used to treat type 2 diabetes mellitus.
Chlorprothixene

Tactaran, Tarasan, Truxal, Vetacalm

Banned

Click to expand

Definition: Antipsychotic

Information:

Its principal indications are the treatment of psychotic disorders (e.g. schizophrenia), and for treatment of depression.
Chlorthalidone

Axamin, Higrotona, Hydro-Long, Hydroton, Igroton, Novo-Thalidone, Odemo-Genat, Renidone, Renon, Thalitone, Uridon, Urolin, Zambesil

Banned

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Definition: Diuretic

Information:

It is often used in the management of hypertension and oedema in humans.
Chlorthenoxazine

Apirogen, Betix, Ossazin, Ossazone, Ossipirina, Reugaril, Reulin, Reumital

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

It has been used for the treatment of rheumatic disorders.
Chlorthiazide (Chlorothiazide)

Azide, Chlotride, Diuril Boluses, Flumen, Lyovac Diuril, Saluretil, Saluric, SK-Chlorothiazide

Conditionally Permitted

Click to expand

Definition: Diuretic

Information:

Chlorothiazide (chlorothiazide) may be used in the control of hypotension and oedema.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Chlorzoxazone

Muscol, Parafon Forte, Paraflex

Banned

Click to expand

Definition: Muscle relaxant

Information:

Used in humans to relax muscles and relieve pain and discomfort associated with strains, sprains, spasms or other muscle injuries.
Ciclesonide

Alvesco, Omnaris, Omniair, Aservo EquiHaler

Conditionally Permitted

Click to expand

Definition: Corticosteroid

Information:

Ciclesonide is used in the control of allergic disease e.g. asthma.

The detection time is estimated with 120 hours (5 days) after inhalational administration.

A detection time is not the same as a withdrawal time. The detection time is the approximate period of time for which a substance (or its metabolite) remains in a horses system such that it can be detected by the laboratory. The withdrawal time for a substance adds a safety margin, chosen with professional judgment and discretion to allow for individual differences between horses such as size, metabolism, degree of fitness, recent illness or disease etc.. You are advised to seek suitable advice from your treating veterinarian.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Cicloprofen

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Non-steroidal anti-inflammatory drug

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Cilazapril

Inhibace

Banned

Click to expand

Definition: Antihypertensive

Information:

It is used for the treatment of hypertension and congestive heart failure.
Cilostazol

Pletal

Banned

Click to expand

Definition: Vasodilator

Information:

It is used in the alleviation of the symptom of intermittent claudication in individuals with peripheral vascular disease.
Cimaterol

Cimaterol LD50

Banned

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Definition: Beta agonist

Information:

Stimulant and fat burning.
Cinchocaine

Proctosedyl, Cincain, Nupercainal, Nupercaine, Sovcaine

Banned

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Definition: Local anaesthetic

Information:

It is the active ingredient in some topical hemorrhoid creams. It is also a component of the veterinary drug Somulose, used for euthanasia of horses and cattle.
Cinchophen

Atophan, Quinophan, Phenaquin

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

It used to be used in human and veterinary medicine to treat gout.
Cinnarizine

Stugeron, Stunarone

Banned

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Definition: Antihistamine

Information:

Mainly used for the control of vomiting caused by motion sickness.

Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Citalopram

Trade names are not currently listed on this site.

Banned

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Definition: Antidepressant

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Clanobutin

Conditionally Permitted

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Definition: Choleretic

Information:

Clanobutin may be used in the management of digestive tract diseases

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Clemastine

Agasten, Dexa Tavegil, Meclastin, Mecloprodin, Tavegil, Tavegyl

Banned

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Definition: Antihistamine

Information:

It is used for the treatment of allergic rhinitis.

Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Clemizole

Alercur, Allerpant, Histacur, Histakool

Banned

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Definition: Antihistamine

Information:

Antipruritic drug used in human medicine. Undergoing trials for potential treatment of hepatitis C in humans.

Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Clenbuterol (Ventipulmin)

Bronq-C, Broncodil, Clenasma, Cesbron, Clenbutol, Contrasmina, Monores, Prontovent, Spiropent

Conditionally Permitted

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Definition: Bronchodilator

Information:

Clenbuteral may be used in the treatment of respiratory diseases.

The detection time is estimated with 168 hours (7 days) after oral administration.

A detection time is not the same as a withdrawal time. The detection time is the approximate period of time for which a substance (or its metabolite) remains in a horse's system such that it can be detected by the laboratory. The withdrawal time for a substance adds a safety margin, chosen with professional judgment and discretion to allow for individual differences between horses such as size, metabolism, degree of fitness, recent illness or disease etc.. You are advised to seek suitable advice from your treating veterinarian.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Clibucaine

Batramycine, Batrax

Banned

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Definition: Local anaesthetic

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Clidinium

Librax, Quarezan, Clindex

Banned

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Definition: Anticholinergic

Information:

It may help symptoms of cramping and abdominal/stomach pain by decreasing stomach acid, and slowing the intestines.
Clobazam

Frisium, Urbanol

Banned

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Definition: Anxiolytic

Information:

Actions and uses similar to those of Diazepam.
Clobenzorex

Asenlix, Dinintel, Finedal, Rexigen

Banned

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Definition: Stimulant

Information:

Used as an anorectic. High potential for affecting performance, and for abuse.
Clobetasol

Cantril, Clobetasolpropionat Mikron, Koniderm

Conditionally Permitted

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Definition: Corticosteroid

Information:

Clobetasol is used in the treatment of various skin disorders.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Clocapramine

Clofekton

Banned

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Definition: Antidepressant

Information:

Used in human medicine for the treatment of schizophrenia.
Clocortolone

Cloderm Cream

Banned

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Definition: Corticosteroid

Information:

Used to treat dermatitis (topical application).
Clodronate

Osphos

Conditionally Permitted

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Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Clodronate Disodium

Conditionally Permitted

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Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Clodronic Acid

Osphos

Conditionally Permitted

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Definition: Bisphosphonate

Information:

Clodronic acid may be used in the treatment of orthopaedic disease.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Clofenamid

Trade names are not currently listed on this site.

Banned

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Definition: Carbonate anhydrase inhibitor

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Clomethiazole

Chloro-S.C.T.Z., Distraneurin, Emineurina, Heminevrin, Somnevrin

Banned

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Definition: Sedative

Information:

It is used in the treatment of confusion, agitation, restlessness, sleeping disorders, and in the treatment of acute alcohol and drug withdrawal symptoms.
Clomiphene

Clomid, Serophene, Milophene

Banned

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Definition: Oestrogen receptor modulator

Information:

It is used mainly for ovarian stimulation in human female infertility. It is also commonly used by male anabolic steroid users to bind the oestrogen receptors in their bodies.
Clomipramine (Clomiprimine)

Anafranil, Clopress, Maronil, Tranquax, Zoiral

Banned

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Definition: Antihistamine

Information:

Used in humans to treat obsessive–compulsive disorder (OCD) and depression, it has been used in dogs to treat separation anxiety. Widely used for the treatment of disturbed behaviour in dogs and cats.
Clomiprimine (Clomipramine)

Anafranil, Clopress, Maronil, Tranquax, Zoiral

Banned

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Definition: Antidepressant

Information:

Used in humans to treat obsessive–compulsive disorder (OCD) and depression, it has been used in dogs to treat separation anxiety. Widely used for the treatment of disturbed behaviour in dogs and cats.
Clonazepam

Klonopin, Ravotril, Rivotril, Rivatril

Banned

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Definition: Anxiolytic

Information:

It is used in human medicine to treat epilepsy.
Clonidine

Catapres, Catarpresan, Catarpres-TTS, Clonistada, Dixarit, Ipotensium, Isoglaucon

Conditionally Permitted

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Definition: Antihypertensive

Information:

Clonidine may be used as a sedative or in the treatment of pain.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Clonixin

Clonix, Dolalgial, Dorixina, Traumicid

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

Used for the treatment of chronic arthritic conditions and certain soft tissue disorders associated with pain and inflammation in humans.
Clopamide

Adurix, Aquex, Brinaldix

Banned

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Definition: Dopamine antagonist

Information:

A thiazide like drug which works in similar way to thiazide diuretics.
Clopidogrel

Plavix

Conditionally Permitted

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Definition: Anti-platelet agent

Information:

Clopridogrel may be used to prevent abnormal blood clot formation.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Cloranolol

Tobanum

Banned

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Definition: Beta blocker

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Clorazepate

Tranxene, Novo-Clopate, Clorazepate

Banned

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Definition: Anxiolytic

Information:

It is used in the treatment of anxiety disorders and insomnia. It may also be prescribed as an anticonvulsant or muscle relaxant.
Clormecaine

Placacid

Banned

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Definition: Local anaesthetic

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Clorprenaline

Asthone, Bazarl, Broncon, Cosmoline, Effectol, Calutein, Pentadoll, Restanolon

Banned

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Definition: Antihistamine

Information:

It is used as a bronchodilator and has general properties similar to those of Isoprenaline.

Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Clostebol

Anabolit, Macrobin, Stearanabol, Sterabol, Test-Anabol, Testomed, Trofodermin-S, Turinabol

Banned

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Definition: Anabolic

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Clothiapine

Entumin, Entumine, Etomine, Etumina, Etumine

Banned

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Definition: Antidepressant

Information:

It is used for the treatment of psychoses.
Clotiazepam

Clozan, Distensan, Trecalmo, Rize, Rizen, Veratran

Banned

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Definition: Anxiolytic

Information:

It is used for the treatment of anxiety and tension. It is not approved for sale in the United States or Canada.
Cloxazolam

Sepazon, Olcadil, Akton, Lubalix

Banned

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Definition: Anxiolytic

Information:

It is used for the treatment of anxiety.
Clozapine

Clozaril, Leponex, Fazaclo, Froidir, Denzapine, Zaponex, Klozapol, Clopine

Banned

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Definition: Antipsychotic

Information:

Used to treat schizophrenia in humans.
Cobalt

Conditionally Permitted

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Definition: Chemical element

Information:

Cobalt is naturally occurring but also found in vitamin and mineral supplements as Vitamin B12. It may be used to increase the number of red blood cells and haemoglobin.

Cobalt is a Threshold Substance.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Cocaine

Trade names are not currently listed on this site.

Banned

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Definition: Stimulant/local anaethestic

Information:

Illegal and high potential to affect performance and drug abuse.
Codeine

Analgiol, Bronchoforton Kodeinsaft, Codicaps, Codicept, Codiforton, Codocalyptol, Coducept, Eulyptan, Pneumogenol, Tussipect Mono

Conditionally Permitted

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Definition: Opioid

Information:

Codeine may be used to relieve pain and to treat diarrhoea.

Codeine is a Specified Substance when detected in the presence of morphine. Specified Substances should not in any way be considered less important or less dangerous than other Prohibited Substances. Rather, they are simply substances which are more likely to have been ingested by Horses for a purpose other than the enhancement of sport performance, for example, through a contaminated food substance.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Colchicine

Colchicine, Colcin, Colgout, Goutichine, Prochic, Reugot, Ticolcin

Banned

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Definition: Rheumatic treatment/anti-cancer

Information:

Cochicine is considered a Specified Substance. It is used in human medicine for the treatment of acute flares of gout and familial Mediterranean fever. Also used in the treatment of irritable bowel syndrome.
Conorphone

Trade names are not currently listed on this site.

Banned

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Definition: Opiod analgesic

Information:

It is an analogue of hydrocodone, somewhat more potent than codeine in analgesic effects, but more side effects associated with it.
Coroxon

Trade names are not currently listed on this site.

Banned

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Definition: Anticoagulant

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Cortisone

Cortelan, Cortisone, Cortisyl, Cortogen, Cortone

Conditionally Permitted

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Definition: Corticosteroid

Information:

Cortisone is used in the treatment of a number of different diseases such as severe allergies and skin problems, asthma and arthritis.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Cortivazol

Altim, Diaster, Dilaster, Idaltim

Banned

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Definition: Corticosteroid

Information:

It has anti-inflammatory and immunosuppressant properties.
Cotinine

Nicoret, Nicorette

Banned

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Definition: Nicotine metabolite

Information:

It has been studied for effectiveness in treating schizophrenia, Alzheimer's and Parkinson's diseases. Not used in veterinary medicine.
Coumarin

Coumarin, Coumarinum, Esberiven Application, Lodema, Lymphex, Lysedem, Venalot Mono, Venium

Banned

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Definition: Anticoagulant

Information:

It has clinical medical value as the precursor to several anticoagulants, including warfarin.
Cromoglycate

PMS-Sodium Cromoglycate

Conditionally Permitted

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Definition: Antihistamine

Information:

Cromoglycate may be used in the control of allergies.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Cromolyn

Alergocrom, Alerion, Colimune, Cromantal, Cromese, Cromoglicin, Cromosol, Cropoz, Dilospir, Fenistil Eye Drops, Flenid, Gastrofrenal, Lomusol, Opticrom, Vividrin

Conditionally Permitted

Click to expand

Definition: Antihistamine

Information:

Cromoglycate may be used in the control of allergies.

Note:

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Cropropamide

Respirot

Banned

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Definition: Stimulant

Information:

Used in combination with crothethamide.
Crotehamide

Trade names are not currently listed on this site.

Banned

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Definition: Stimulant

Information:

Used in combination with cropropramide. Used for respiratory stimulation.
Cyamemazine

Cianatil, Tercian

Banned

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Definition: Antipsychotic

Information:

It is used for the treatment of neuro-psychiatric disorders. Not commonly used in veterinary medicine, and has a high potential to affect athletic performance.
Cyclandelate

Cyclospasmol

Banned

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Definition: Vasodilator

Information:

It is used in various blood vessel diseases, e.g. claudication, arteriosclerosis and Raynaud's disease.
Cyclizine

Echnatol, Merazine, Valoid

Banned

Click to expand

Definition: Antihistamine

Information:

Used to treat nausea, vomiting and dizziness associated with motion sickness, vertigo and post-operatively, following general anaesthesia and opioid administration.

Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Cyclobarbital

Fanodormo Calcico, Phanodorm, Somnupan C

Banned

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Definition: Sedative

Information:

It is used for the treatment of epilepsy and as a narcotic. Not commonly used in veterinary medicine, and has a high potential to affect performance.
Cyclobenzaprine

Apo-Cyclobenzaprine, Flexeril, Fexmid

Banned

Click to expand

Definition: Muscle relaxant

Information:

Usually prescribed to relieve pain and muscle spasms.
Cyclofenil (Cyclophenil)

Fertodur, Menopax, Neoclym

Banned

Click to expand

Definition: Anti-oestrogenic

Information:

It is used in the treatment of menstrual disorders, menopausal symptoms and abovulatory infertility. Cyclofenil acts as a modulator of estrogen receptors. Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Cycloguanil

Trade names are not currently listed on this site.

Banned

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Definition: Antimalarial

Information:

Used in research into anti-malarial drugs.
Cyclomethycaine

Surfacaine

Banned

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Definition: Local anaesthetic

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Cyclopentamine

Cyclonarol, Cyklosan, Sinos

Banned

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Definition: Psychoactive

Information:

Used as a nasal decongestant, notably in Europe and Australia. . Now discontinued because it was superceded by safer and more effective drugs.
Cyclopentolate

Ak-Pentolate, Ciclolux, Colircusi Cicloplejico, Cyclogyl, Cyclopentol, Cyclopentolate, Mydrilate, Skiacol, Zykolat

Banned

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Definition: Antimuscarinic

Information:

Used in paediatric eye examinations.
Cyclophenil (Cyclofenil)

Fertodur, Menopax, Neoclym

Banned

Click to expand

Definition: Anti-oestrogenic

Information:

It is used in the treatment of menstrual disorders, menopausal symptoms and abovulatory infertility. Cyclophenil acts as a modulator of estrogen receptors. Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Cyclothiazide

Anhydron, Renazide

Banned

Click to expand

Definition: Diuretic

Information:

Used in the management of hypertension.
Cycrimine

Cicrimina, Cycriminum, Pagitane

Banned

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Definition: Anticholinergic

Information:

Widely used in humans in the treatment and management of Parkinson's disease. Has the potential to affect performance.
Cyproheptadine

Apenorm, Cyproheptadine, Cyprono, Cyprosian, Nuran, Periactinol, Periatin, Peritol, Supersan

Conditionally Permitted

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Definition: Antihistamine

Information:

Cyproheptadine may be used in the control of allergies and in the treatment of headaches and Cushing's disease.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Danazol

Azol, Cyclomen, Danatrol, Danocrine, Danokrin, Danol, Vabon, Winobanin

Banned

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Definition: Anabolic

Information:

It has been used (off-licence) in humans in the management of menorrhagia, fibrocystic breast disease, immune thrombocytopenic purpura, breast pain (mastodynia) and hereditary angioedema.
Dantrolene

Danlene, Dantamacrin, Dantralen, Dantrium, Dantrolen

Conditionally Permitted

Click to expand

Definition: Muscle relaxant

Information:

Dantrolene may be used in the treatment of muscle stiffness or spasms.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Dapsone

Acedapsone, Avlosulfon, Daps, Dubronax, Servidapsone, Sulfona

Banned

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Definition: Antileprotic

Information:

Used in combination with rifampicin and clofazimine in treatment of Mycobacterium leprae (Leprosy), but also used in the treatment of pemphigoid, lichen planus, pneumocisti carinii (or PCP pneumonia), and malaria.
Decamethonium

Decacuran,Lopac-D-1260, Syncurine

Banned

Click to expand

Definition: Muscle relaxant

Information:

Used during anaesthetic procedures as a neuromuscular blocking agent and/or skeletal muscle relaxant. Horses appear to be less sensitive to its action due to increased quantities of enzymes which metabolise this substance.
Dehydrochloromethyltestosterone

Durabolin, Turinabol

Banned

Click to expand

Definition: Anabolic

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Dehydrochlorotestosterone

Trade names are not currently listed on this site.

Banned

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Definition: Anabolic

Information:

Used as an anabolic substance with effects approximately equal to, or slightly greater than, those of testosterone, while exhibiting little or no androgenic activity.
Delmadinone acetate

Delmate, Estrex, Tardak, Tardastren, Tardastrex, Vetadinon, and Zenadrex

Banned

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Definition: Hormone

Information:

Controls Testosterone levels producing chemical castration.
Delorazepam

Trade names are not currently listed on this site.

Banned

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Definition: Anxiolytic

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Dembrexine

Dembrexina, Dembrexin, Sputolysin

Conditionally Permitted

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Definition: Mucolytic

Information:

Demxbrexine may be used in the treatment of respiratory disease.

The detection time is estimated with 120 hours (5 days) after oral administration.

A detection time is not the same as a withdrawal time. The detection time is the approximate period of time for which a substance (or its metabolite) remains in a horse's system such that it can be detected by the laboratory. The withdrawal time for a substance adds a safety margin, chosen with professional judgment and discretion to allow for individual differences between horses such as size, metabolism, degree of fitness, recent illness or disease etc.. You are advised to seek suitable advice from your treating veterinarian.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Demecolcine

Colcemid, Omain, Omaine, Reichstein's F, Santavy's Substance F, Substance F

Banned

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Definition: Rheumatic treatment/anti-cancer

Information:

Demecolcine is a Specified Substance. It is medically used to improve the results of radiotherapy, as the metaphase is the radiosensitive phase of the cell cycle, and to control leukaemia and gout. Also used in animal cloning, as it induces the ejection of the cell nucleus, creating space for the insertion of a new one.
Demoxepam

Trade names are not currently listed on this site.

Banned

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Definition: Anxiolytic

Information:

It is a benzodiazepine derivative, and a metabolite of chlordiazepoxide, with anticonvulsant properties.
Deoxycorticosterone

Cortexon, Corticosterone, Cortiron, Cortitron, Cortisteron, Descotone, Dorcostrin, Percorten V (acetate), Percorten pivalate, Syncortyl

Banned

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Definition: Corticosteroid

Information:

It is used in the treatment of Addison's disease, and other adrenocortical deficiency states.
Deptropine

Brontin, Brontina, Brontine

Banned

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Definition: Antihistamine with anticholinergic activity

Information:

Used in the treatment of asthma and bronchitis.

Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Deracoxib

Deramaxx

Conditionally Permitted

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Definition: Non-steroidal anti-inflammatory

Information:

Deracoxib may be used to relieve pain and inflammation

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Dermorphin

Trade names are not currently listed on this site.

Banned

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Definition: Peptide opiod receptor agonist

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Deserpidine

Aescin, Canescin, Canescine, Deresperine, Deserpine, Harmonyl, Raunorine, Raunormin, Raunormine, Recanescin, Recanescine, Reserpidine, Tranquinil

Banned

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Definition: Antipsychotic

Information:

It is used for the treatment of hypertension.
Desipramine

Deprexan, Desipramine, Norpramine, Nortimil, Pertofran, Pertofrane, Sertofren

Banned

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Definition: Antidepressant

Information:

It is used to treat depression and neuropathic pain.
Desmethylpyrilamine

Conditionally Permitted

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Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Desonide

Apolar, DesOwen, Sine Fluor, Tridesilon Ointment

Banned

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Definition: Corticosteroid

Information:

It is used in the treatment of various skin disorders.
Desoximethasone (Desoxymethasone)

Actiderm, Flubason, Ibaril, Stiedex, Topicorete, Topicort, Topicorte, Topiderm

Banned

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Definition: Corticosteroid

Information:

It is used in the treatment of various skin disorders.
Desoxyephedrine

Desoxyn

Banned

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Definition: Stimulant

Information:

It is used for the treatment of attention deficit/hyperactivity disorder.
Desoxymethasone (Desoximethasone)

Actiderm, Flubason, Ibaril, Stiedex, Topicorete, Topicort, Topicorte, Topiderm

Banned

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Definition: Corticosteroid

Information:

It is used in the treatment of various skin disorders.
Desoxymethyltestosterone

Trade names are not currently listed on this site.

Banned

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Definition: Anabolic

Information:

A synthetic steroid, specifically produced for human performance enhancement.
Desoxyvinyl-testosterone

Banned

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Definition: Anabolic

Information:

An anabolic steroid analogue of of Madol (also known as desoyx-methyltestosterone) with no legitimate therapeutic indication in the equine athlete.
Detomidine

Domosedan, Dormosedan

Conditionally Permitted

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Definition: Sedative

Information:

Detomidine may be used for sedation and anaesthetic premedication.

The detection time is estimated with 48 hours (2 days) after intra-venous administration.

Please remember: A detection time is not the same as a withdrawal time.The detection time is the approximate period of time for which a substance (or its metabolite) remains in a horse's system such that it can be detected by the laboratory. The withdrawal time for a substance adds a safety margin, chosen with professional judgment and discretion to allow for individual differences between horses such as size, metabolism, degree of fitness, recent illness or disease etc. You are advised to seek suitable advice from your treating veterinarian.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Dexamethasone

Azium, Decaspray, Dectancyl, Deronil, Dexaltin, Dexamethasone, Dexject SP, Hostadex, Millicortene, Taprodex, Tuttozem N, Visumetazone, Wymesone

Permitted

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Definition: Corticosteroid

Information:

Dexamethasone is used to treat many inflammatory and auto-immune conditions.

The detection time is estimated with 48 hours (2 days) after intra-venous administration.

Please remember: A detection time is not the same as a withdrawal time. The detection time is the approximate period of time for which a substance (or its metabolite) remains in a horse's system such that it can be detected by the laboratory. The withdrawal time for a substance adds a safety margin, chosen with professional judgment and discretion to allow for individual differences between horses such as size, metabolism, degree of fitness, recent illness or disease etc. You are advised to seek suitable advice from your treating veterinarian.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

The maximum permitted plasma concentration of Dexamethasone is 0.003 micrograms per milliliter.

When dexamethasone is administered, the dose should be accurately calculated according to the actual weight of the horse.

Dexamethasone administration IV or IM at 12 or more hours prior to competing (2.0 mg or less per 100 pounds IV or IM at 12 or more hours before competition). Each 24 hours, not more than 2.0 milligrams of dexamethasone injectable solution per 100 pounds of body weight should be administered intravenously or intramuscularly. No part of this dose should be administered during the 12 hours prior to competing. Dexamethasone should not be administered for more than five successive days.

Dexamethasone administration IV at 6 or more hours prior to competing (0.5 mg or less per 100 pounds IV at 6 or more hours before competition). Each 24 hours, not more than 0.5 milligram of dexamethasone injectable solution per 100 pounds of body weight should be administered intravenously. No part of this dose should be administered during the six (6) hours prior to competing. Dexamethasone should not be administered for more than five successive days.

Dexamethasone administration orally at 6 or more hours prior to competing. (1.0 mg or less per 100 pounds orally at 6 or more hours before competition). Each 24 hours, not more than 1.0 milligram of dexamethasone powder per 100 pounds of body weight should be administered orally. No part of this dose should be administered during the 6 hours prior to competing. Any medicated feed should be either consumed or removed at least six (6) hours prior to competing. Dexamethasone should not be administered for more than five successive days.
Dextromethorphan

Broncho-grippol-DM, Bal-Minil DM, Benylin DM, Robitussin

Banned

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Definition: Antitussive

Information:

It is used for the treatment of dry coughs.
Dextromoramide

Jetrium, Narcolo, Palfium

Banned

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Definition: Narcotic

Information:

It is used in the treatment of severe pain.
Dextropropoxyphene

Abalgin, Algafan, Darvon, Depronal, Develin, Doloxene, Liberen, Novo-Propoxyn,

Banned

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Definition: Opiate analgesic

Information:

It is used in combination with other analgesics with anti-inflammatory and antipyretic effects, such as Aspirin and Paracetamol.
Dextrorphan

Trade names are not currently listed on this site.

Banned

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Definition: Antitussive

Information:

It acts as a cough suppressant and dissociative hallucinogen.
Dezocine

Dalgan

Banned

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Definition: Opiate analgesic

Information:

It is used for the relief of severe pain.
Diacerein

Artrodar, Artrolyt, Fisiodar, Verboril

Banned

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Definition: Antiarthritic

Information:

It is used in the treatment of of osteoarthritis.
Diamorphine (Heroin)

Diamorf, Diamorphine, Diaphin

Banned

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Definition: Narcotic

Information:

It is used in the treatment of severe pain, myocardial infarction, acute pulmonary oedema, and chronic pain.
Diaveridine

Trade names are not currently listed on this site.

Banned

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Definition: Folic acid antagonist

Information:

It is used for the control of coccidiosis in poultry.
Diazepam

Complutine, Dialar, Diaquel, Diazemuls, Diazepam, Dienpax, Dizac, Ducene, Duradiazepam, Hexalid, Lamar, Relanium, Saromet, Stesolid, Valium

Conditionally Permitted

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Definition: Sedative

Information:

Diazepam may be used to reduce anxiety, as sedation and in anaesthetic premedication.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Diazoxide

Diazoxide, Eudemine, Hyperstat, Proglicem, Proglycem

Banned

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Definition: Muscle relaxant

Information:

It is used in the treatment of acute hypertension and diabetes.
Dibenzepin

Ecatril, Neodalit, Noveryl, Victoril

Banned

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Definition: Psychoactive

Information:

It is used in the treatment of depression.
Dibucaine

Cincain, Cinchocaine, Nupercainal, Somulose

Banned

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Definition: Local anaesthetic

Information:

It can be found in some topical hemorrhoid creams. As a component of Somulose, it is used for euthanasia of horses and cattle.
Dichlorisone

Dermaren, Dicloderm, Diclasone

Banned

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Definition: Corticosteroid

Information:

It is used for the treatment of various skin disorders.
Dichloroacetate

Ditrei, Oxypangam, Sklerocedin N, Lactanase Injection

Conditionally Permitted

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Definition: Organic acid

Information:

Dichloroacetate may be used to reduce blood lactate.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Dichlorphenamide

Antidrasi, Daranide, Dasanide, Fenamide, Glaucol, Glauconide, Glaumid, Oralcon, Oratrol, Tensodilen

Banned

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Definition: Carbonic anhydrase inhibitor

Information:

It is used for the treatment of glaucoma.
Diclofenac

Algenac, Dichronic, Diclofenac, Diclo-Phlogont, Dolofenac, Doltarac, Neriodin, Reumadil, Surpass, Tsudohmin, Voltaren

Permitted

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Definition: Non-steroidal anti-inflammatory

Information:

Diclofenac may be used to relieve pain and inflammation

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

The maximum permitted plasma concentration of Diclofenac is 0.005 micrograms per milliliter.

When diclofenac liposomal cream is administered, not more than 73 mg should be administered, to not more than one affected site, every 12 hours (i.e., not more that 146 mg per 24-hour period). This 73 mg dose equals a 5-inch ribbon of cream not greater than 1/2 inch in width, which should be rubbed thoroughly into the hair over the joint or affected site using gloved hands. Administration of diclofenac cream should be discontinued at least 6 hours prior to competing. The maximum treatment time for diclofenac cream is 10 successive days.

To avoid a stacking of NSAIDs violation under NRHA Medication Rules, only a single NSAID should be administered within 3 days (72 hours) of showing the horse.

Example: If your horse is on Banamine (Flunixin) prior to the show and you plan to switch to Phenylbutazone ("Bute") at the show, you should discontinue administering Banamine at least 72 hours prior to show time.
Dicumarol

Acadyl, Acavyl, Anathrombase, Antitrombosin, Apekumarol, Baracoumin, Cuma, Cumid, Dicoumal, Dicuman, Dicumaol R, Dicumarol, Dicumol, Dufalone, Kumoran, Melitoxin, Temparin, Trombosan

Banned

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Definition: Anticoagulant

Information:

Uses are similar to those of Warfarin.
Diethylpropion

Delgamer, Diethylpropion, Menutil, Prefamone, Regenon, Tenuate Dospan

Banned

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Definition: Anorexic

Information:

It is used in the treatment of exogenous obesity.
Diethylthiambutene

Trade names are not currently listed on this site.

Banned

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Definition: Opiate analgesic

Information:

It is used as an anaesthetic in veterinary medicine.
Diethyltryptamine

Trade names are not currently listed on this site.

Banned

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Definition: Psychedelic

Information:

It is an hallucinogenic agent, similar to dimethyltryptamine.
Diflorasone acetate

ApexiCon, Florone E, Flutone, Psorcon E, Vincosona

Banned

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Definition: Corticosteroid

Information:

It is used in the treatment of various skin disorders.
Diflucortolone

Claral, Dermaval, Neriforte, Nerisona, Nerisone, Temetex

Banned

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Definition: Corticosteroid

Information:

It is used for the treatment of various skin disorders.
Diflunisal

Adomal, Artrodol, Diflonid, Difludol, Diflunil, Dolisal, Dolobid, Dolobis, Donobid, Dorbid, Fluniget, Fluodonil, Flustar, Ilacen, Noaldol, Reuflos, Unisal

Banned

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Definition: Analgesic

Information:

It is used as an analgesic for the relief of pain and inflammation in osteoarthritis and rheumatoid athritis.
Digitoxin

Asthenthilo, Coramedan, Crystodigin, Digicor, Digilong, Digimed, Digimerck, Digipural, Digitaline, Digitasid, Digitrin, Ditaven, Mono-Glycocard, Tardigal

Banned

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Definition: Anti-arrhythmic

Information:

It is used for the treatment of poor or erratic kidney function, and heart failure.
Digoxin

Cardigox, Cardiogoxin, Cardioreg, Coragoxine, Digacin, Digivern, Digomal, Digitek, Eudigox, Lanacordin, Lanachrist, Lanicor, Lanorale, Lanoxin, Lanoxicaps, Lanoxcine, Natigoxin, Novodigal, Prodigox

Conditionally Permitted

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Definition: Anti-arrhythmic

Information:

Digoxin may be used in the treatment of heart failure and cardiac rhythm abnormalities.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Dihydrocodeine

DHC Continus, Paracodine, Remedacen, Rikodeine, Tiamon

Banned

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Definition: Opiod analgesic

Information:

It is used for the relief of moderate to severe pain.
Dihydrocodeinone

Hydrococet, Symtan, Anexsia, Dicodid, Hycodan, Hydromet, Hycomine, Hycet, Lorcet, Lortab, Norco, Novahistex, Hydrovo, Duodin, Kolikodol, Orthoxycol, Mercodinone, Synkonin, Norgan, Hydrokon, Vicodin

Banned

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Definition: Opiod analgesic

Information:

It is used to relieve moderate to moderately severe pain.
Dihydroergotamine

Adhaegon, Dergiflux, Dergolyoc, Dergotamine, Detemes, DHE, Dihydergot, Dihydroergotamine, Diidergot, Ergovasan, Orstanorm, Tonopres

Banned

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Definition: Ergot alkaloid

Information:

It is used for the treatment of acute attacks of migraine and acute cluster headache episodes.
Dihydromorphine

Paramorphan

Banned

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Definition: Opiod analgesic

Information:

It is used for the relief of severe and moderate pain.
Diisopropylamine

B-15, Cubisol, Dedyl, Diedi, Kalodil, Neovascoril, Nutricor, Oxypangam, Vasculene, Pangamic acid,Top B15+3,DADA 250, Tridenosen, Heptenal

Banned

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Definition: Vasodilator

Information:

It is used in the treatment of peripheral and cerebral vascular disorders.
Diltiazem

Acalix, Altiazem, Angizem, Britiazim, Calcicard, Cardizem, Diladel, Diltiazem, Hart, Herbesser, Incoril, Masdil, Presoquin, Tilazem, Tildiem, Zilden

Conditionally Permitted

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Definition: Anti-arrythmic

Information:

Diltiazem may be used in the treatment of heart rhythm abnormalities.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Dimefline

Reanimil, Remeflin

Banned

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Definition: Respiratory stimulant

Information:

It is used as a respiratory stimulant and acts like Doxapram.
Dimethindene

Fengel, Fenistil, Fenostil, Trimedil N

Banned

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Definition: Antipruritic

Information:

It is used in the treatment of allergic conditions.
Dimethisoquin

Haneal, Isochinol, Pruralgan, Pruralgin, Quotane

Banned

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Definition: Local anaesthetic

Information:

It is used for the relief of pain and pruritos associated with haemorrhoids, sunburn and insect stings.
Dimethyl Sulphoxide (DMSO)

Decap, Deltan, Demasorb, Demavet, Demeso, Demsodrox, Dermasorb, Dimexide, Dolicur, Doligur, Domoso, Dromisol, Durasorb, Gamasol 90, Hyadur, Infiltrina, Kemsol, Rimso 50, Sclerosol, Somipront, Syntexan, Topsyn

Conditionally Permitted

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Definition: Solvent

Information:

Dimethyl Sulphoxide (DMSO) may be used in the treatment of inflammation.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Dimethylamphetamine

Trade names are not currently listed on this site.

Banned

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Definition: Stimulant

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Dimethyltryptamine

Trade names are not currently listed on this site.

Banned

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Definition: Psychedelic

Information:

Its role in therapy is doubtful, and it was used for some time as an adjunct to psychotherapy. Its use has been abandoned.

Dimethyltryptamine is a Specified Substance. Specified Substances should not in any way be considered less important or less dangerous than other Prohibited Substances. Rather, they are simply substances which are more likely to have been ingested by Horses for a purpose other than the enhancement of sport performance, for example, through a contaminated food substance.
Diphenadione

Contrax-D, Didandin, Didion, Dipaxin, Diphac, Diphacin, Diphacins, Gold Crest, Kill-Ko Rat Killer, Oragulant, Parakakes, Promar, Promar PCQ, Ramik, Ratindan,Ratindan 1, Rodent Cake, Solvan

Banned

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Definition: Anticoagulant

Information:

Its actions are similar to those of Warfarin. Like Phenindione, its use has declined in favour of Coumarins.
Diphenhydramine

Benadryl Original, Benetussin, Broncleer, Cotussin, Dastusin, Delixir, Histodor Expectorant, Lupihist, Med-Tussin, Relief-Coff

Conditionally Permitted

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Definition: Antihistamine

Information:

Diphenhydramine may be used in the control of allergies.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Diphenoxylate

Diarsed, Diphenoxylate, Lofenoxal, Lomotil, Lonox

Banned

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Definition: Opiod agonist

Information:

It is used in the treatment of acute and chronic diarrhoea.
Diphenylpyraline

Arbid N, Hispril, Histalert, Histryl, Lergoban, Lyssipoll

Banned

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Definition: Antihistamine

Information:

It is used for the treatment of allergic rhinitis and allergic skin disorders.

Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Dipipanone

Diconal, Fenpidon, Pipadone, Wellconal

Banned

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Definition: Opiod analgesic

Information:

It is used to treat moderate or severe pain.
Diprenorphine

M5050, Revivon

Banned

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Definition: Opiod analgesic

Information:

It is used to tranquilise large animals.
Diprophylline

Alergical Expect, Philinal, Ozothine

Banned

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Definition: Bronchodilator

Information:

It is used for the relief of acute bronchal asthma and reversible bronchospasms, associated with chronic bronchitis and emphysema.
Dipyridamole

Anginal, Cleridium, Coribon, Coronarine, Corosan, Coroxin, Dipyridamole, Dipyridan, Maxicardil, Miosen, Natyl, Novodil, Peridamol, Persantin, Procardin, Trompersantin

Banned

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Definition: Antiplatelet

Information:

It is used for stroke prophylaxis (antithrombotic activity). It has also been used as a vasodilator in the long-term management of chronic angina pectoris.
Dipyrone (Metamizole)

Adolkin, Alginodia, Dolemicin, Lasain, Metilon, Metamizole, Minalgin, Neo-Melubrine, Nolotil, Novalgin, Novaminsulfon, Novemina, Optalgin, Vetalgin, Zimeta

Conditionally Permitted

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Definition: Non-steroidal anti-inflammatory

Information:

Dipyrone (metamizole) may be used to relieve pain and spasms.

The detection time is estimated with 72 hours (3 days) after intravenous administration.

A detection time is not the same as a withdrawal time. The detection time is the approximate period of time for which a substance (or its metabolite) remains in a horse's system such that it can be detected by the laboratory. The withdrawal time for a substance adds a safety margin, chosen with professional judgment and discretion to allow for individual differences between horses such as size, metabolism, degree of fitness, recent illness or disease etc.. You are advised to seek suitable advice from your treating veterinarian.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

To avoid a stacking of NSAIDs violation under NRHA Medication Rules, only a single NSAID should be administered within 3 days (72 hours) of showing the horse.

Example: If your horse is on Banamine (Flunixin) prior to the show and you plan to switch to Phenylbutazone ("Bute") at the show, you should discontinue administering Banamine at least 72 hours prior to show time.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Disopyramide

Dicorynan, Dirythmin, Diso-Duriles, Durbis, Norpace, Rythmodan, Rythmodul

Banned

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Definition: Anti-arrhythmic

Information:

It is used for the treatment of ventricular arrhythmias.
Disulfiram

Abstensil, Abstinyl, Antabus, Antietil, Antivitium, Averzan, Esperal, Etiltox, Refusal

Banned

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Definition: Aldehyde dehydrohenase inhibitor

Information:

It is used in the treatment of chronic alcoholism.
Dixyrazine

Esucos

Banned

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Definition: Antipsychotic

Information:

It is used in the treatment of psychiatric disorders.
DMAA

Iron Tiger, Forthane, Geranamine, Floradrene

Banned

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Definition: Sympathomimetic

Information:

DMAA is a stimulant that can affect performance and has no legitimate use in sports horses
DMSO (Dimethyl Sulphoxide)

Decap, Deltan, Demasorb, Demavet, Demeso, Demsodrox, Dermasorb, Dimexide, Dolicur, Doligur, Domoso, Dromisol, Durasorb, Gamasol 90, Hyadur, Infiltrina, Kemsol, Rimso 50, Sclerosol, Somipront, Syntexan, Topsyn

Conditionally Permitted

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Definition: Solvent

Information:

DMSO (Dimethyl Sulphoxide) may be used in the treatment of inflammation.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Dobutamine

Dobucard, Dobuject, Dobutamine, Dobutrex, Posiject

Conditionally Permitted

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Definition: Sympathomimetic

Information:

Dobutamine is used in the treatment of hypotension.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Donepezil

Alzaimax, Aricept, Aricept ODT, Donepezil, Eranz, Memorit

Banned

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Definition: Cholinesterase inhibitor

Information:

It is used in the treatment of Alzheimer's disease.
Dopamine

Cordodopa, Dopamine, Dynatra, Giludop, Hettytropin, Inotropin, Inovan, Intropin, Revimine, Revivan

Conditionally Permitted

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Definition: Stimulant

Information:

Dopamine may be used in the treatment of hypotension during anaesthesia.

Dopamine is a Threshold Substance.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Dopexamine

Dopacard

Banned

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Definition: Beta 2 adrenergic receptor agonist

Information:

It is used in the management of heart failure.
Dorzolamide

Dorzolamide, Dorzox, Glaucotensil, Timsopt, Trusopt

Conditionally Permitted

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Definition: Carbonic anhydrase inhibitor

Information:

Dorzolamide may be used in the treatment of opthalmic disease.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Dothiepin

Dopress, Dothep, Prothiaden, Thaden

Banned

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Definition: Antidepressant

Information:

It is used in the treatment of low-level anxiety, depression and similar disorders.
Doxacurium

Nuromax

Banned

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Definition: Muscle relaxant

Information:

It is used to facilitate endotrachial intubation and skeletal muscle relaxation during surgery, mechanical ventilation and general anaesthesia.
Doxapram

Docatone, Dopram, Doxapram, Doxapril, Stimulexin

Conditionally Permitted

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Definition: Stimulant

Information:

Doxapram may be used to stimulate the central nervous system.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Doxepin

Adapin, Aponal, Doxepin, Quitaxon, Sinequan, Sinquan, Sinquane, Triadapin

Banned

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Definition: Antidepressant

Information:

It is used in the treatment of depression.
Doxylamine

Alsadorm, Decapryn, Gittalun, Hoggar N, Mereprine, Sanalepsi N, Sedaplus, Somnil, Unisom-2

Conditionally Permitted

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Definition: Antihistamine

Information:

Doxylamine may be used in the control of allergies.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Drofenine

Cibalen, Espasmo Cibalena, Lunadon, Sonotryl, Spasmoplus, Spasmo-Cibalgin, Trasentine A

Banned

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Definition: Antispasmodic

Information:

It is used in the treatment of antispasmodic and anticholinergic disorders such as gastric and cardio-respiratory diseases.
Dromostanolone

Drolban, Masterid, Masteril, Masteron, Permastril

Banned

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Definition: Anabolic

Information:

It is used in the treatment of cancer.
Droperidol

Dehidrobenzperidol, Dridol, Droleptan, Inapsine, Sintosian

Banned

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Definition: Antipsychotic

Information:

It is used as a tranquiliser, and to reduce the incidence of nausea and vomiting in surgical and diagnostic procedures.
Drospirenone

Jasminelle, Yasmin, Yaz, Yira, Yirala

Banned

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Definition: Diuretic

Information:

It is used for the prevention of pregnancy in women.
Drostanolone

Masterid, Masteril, Masteron, Masterone, Permastril

Banned

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Definition: Anabolic

Information:

It is used in the treatment of cancer in women.
Drotaverine

No-Spa, Drotin DS, Doverin, Trospa

Conditionally Permitted

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Definition: Anti-spasmodic

Information:

Drotaverine may be used to relieve pain and spasms.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Duloxetine

Cymbalta, Duxetin, Xeristar, Yentreve

Banned

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Definition: Antidepressant

Information:

It is used for the treatment of Major Depressive Disorders (MDD).
Dyclonine

Dyclone, Dyclothane, Tanaclone

Banned

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Definition: Oral anaesthetic

Information:

It is used for topical anaesthesia of the skin and mucous membranes.
Dyphylline

Dilor, Glyfyllin, Neothylline, Neutrafillina, Neutraphyllin, Propyphyllin, Silbephyllin, Teofen

Banned

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Definition: Muscle relaxant

Information:

It is used to relieve acute bronchial asthma and reversible bronchospasms associated with chronic bronchitis and emphysema.
Ecgonine Methyl Ester

Trade names are not currently listed on this site.

Banned

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Definition: Cocaine metabolite

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Edrophonium

Anticude, Enlon, Reversol, Tensilon

Banned

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Definition: Angiotensin-converting enzyme inhibitor

Information:

It is used for differential diagnosis of myasthenia gravis, and for evaluating emergency treatment in a myastenic crisis.

Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Efaproxiral

Efaproxyn

Banned

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Definition: Haemoglobin modifier

Information:

It is used in the treatment of certain types of cancer to increase oxygen levels in hypoxic blood.
Eletriptan

Relert, Relpax

Banned

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Definition: Migraine relief

Information:

It is used in the treatment of migraine.
Eltenac

Telzenac

Conditionally Permitted

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Definition: Non-steroidal anti-inflammatory

Information:

Eltenac may be used to relieve pain and control fever.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Embramine

Bromadryl, Mebryl, Medrin

Banned

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Definition: Antihistamine

Information:

It is an ethanolamine derivative with the properties and uses of antihistamine.

Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Embutramide

T-61 Euthanasia Solution

Banned

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Definition: Sedative

Information:

It is used for the euthanasia of different animals.
Emepronium

Cetiprin, Cetiprin Novum, Detrulisin, Hexanium, Uro-Ripirin

Banned

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Definition: Antispasmodic

Information:

It is used to reduce the muscular tone of urinary bladder in postoperative vesical tenesmus, and in urinary frequency.
Emidonol

Banned

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Definition: Anti-ischaemic

Information:

The substance contains meldonium which is used to treat ischaemia and has anticonvulsant effects. It can also enhance performance and improve recovery time after exercise.
Enalapril (Enalaprilat)

Bonuten, Enalapril Richet, Gadopril, Kinfil, Vasotek I.V.

Banned

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Definition: Angiotensin-converting enzyme inhibitor

Information:

It is used in the treatment of various types of heart failure and hypertension.

Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Enalaprilat (Enalapril)

Bonuten, Enalapril Richet, Gadopril, Kinfil, Vasotek I.V.

Banned

Click to expand

Definition: Angiotensin-converting enzyme inhibitor

Information:

It is used in the treatment of various types of heart failure and hypertension.

Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Enciprazine

Trade names are not currently listed on this site.

Banned

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Definition: Anxiolytic

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Endorphins

Trade names are not currently listed on this site.

Banned

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Definition: Endogenous opiods

Information:

It is used as an opioid analgesic.
Enkephalins

Trade names are not currently listed on this site.

Banned

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Definition: Endogenous pain relief

Information:

It is used to relieve moderate pain.
Ephedrine

Ectasule Minus, Efetonina, Ephedral, Ephetonin, Fedrine, Minims Ephedrine Hydrochloride, Rhino-Vaccin, Rino Pumilene, Roter, Spaneph, Stopasthme

Banned

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Definition: Stimulant (High level)

Information:

It has a stimulant effect on the respiratory center and central nervous system.
Epi-dihydrotestosterone

Banned

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Definition: Anabolic

Information:

A potent metabolite of testosterone with no legitimate therapeutic indication in the equine athlete.
Epibatidine

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Analgesic

Information:

It was used for the treatment of neuropathic pain in humans, but dropped from further development because of serious side effects.
Epiternbolone

Trade names are not currently listed on this site.

Banned

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Definition: Anabolic

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Epitestosterone

Banned

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Definition: Anabolic

Information:

An epimer of testosterone with no legitimate therapeutic indication in the equine athlete.
Eplerenone

Inspra

Banned

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Definition: Diuretic

Information:

A diuretic used in the treatment of hypertension and heart failure. It has no therapeutic indication in the equine athlete.
Ergonovine

Basergin, Ergonovine, Ergotrate, Metrergina, Mitrotan

Banned

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Definition: Vasoconstrictor

Information:

It is used to prevent bleeding after childbirth.

Ergonivine is a Specified Substance. Specified Substances should not in any way be considered less important or less dangerous than other Prohibited Substances. Rather, they are simply substances which are more likely to have been ingested by Horses for a purpose other than the enhancement of sport performance, for example, through a contaminated food substance.
Ergotamine

Ergomar, Ergostat, Medihaler-Ergotamine, Wigrettes

Banned

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Definition: Plant alkaloid

Information:

It is used in the management of vascular headache, by either preventing or aborting onset of this condition.

Ergotamine is a Specified Substance. Specified Substances should not in any way be considered less important or less dangerous than other Prohibited Substances. Rather, they are simply substances which are more likely to have been ingested by Horses for a purpose other than the enhancement of sport performance, for example, through a contaminated food substance.
Ertugliflozin

Steglatro

Conditionally Permitted

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Definition: Anti-hyperglycaemic

Information:

Ertugliflozin may be used in the treatment of equine metabolic syndrome.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Erythrityl tetranitrate

Trade names are not currently listed on this site.

Banned

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Definition: Blood vessel relaxant

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Erythropoietin (EPO)

Aranesp, Dynepo, Epocrin, Epogen, Erypo, Exetin-A, Pronivel

Banned

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Definition: Erythropoiesis

Information:

It is used in the treatment of anaemia, cancer, and other critical illnesses, such as heart failure.
Esmolol

Brevibloc, Esmolol, Miniblock

Banned

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Definition: Beta blocker

Information:

It is used in the treatment of cardiac arrhythmias. It has similiar properties to those of Propanolol.
Estazolam

Domnamid, Esilgan, Estazolam, Eurodin, Nuctalon

Banned

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Definition: Anxiolytic

Information:

It is used in the treatment of certain sleep disorders.
Estranediol

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Anabolic

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Estrone

Cristallovar, Femogen, Kolpon, Oestrilin

Conditionally Permitted

Click to expand

Definition: Hormone

Information:

Estrone is an ostrogen hormone that may also be used in the control of exercise induced pulmonary haemorrhage.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Etafedrine

Nethaprin

Banned

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Definition: Adrenergic

Information:

It is used in the management of bronchospasms.
Etamiphylline

Boifilina, Corafil, Dechophyline, Iodafilina, Longtussin, Solufilina, Ultratussin

Banned

Click to expand

Definition: Bronchodilator

Information:

It is used in the treatment of cardiac and respiratory distress in neonatal foals.
Etamivan

Clairvan, Corivanil, Romecor, Vandid

Banned

Click to expand

Definition: Stimulant

Information:

It is used in the treatment of chronic obstructive pulmonary disease, and barbiturate overdose.
Etanercept

Enbrel

Banned

Click to expand

Definition: Tumor necrosis factor inhibition

Information:

It is used for the treatment of various types of arthritis, and moderate to severe plaque psoriasis.
Ethacrynic acid

Crinuryl, Edecril, Edecrin, Edecrina, Hidromedin, Mingit, Otacril, Reomax, Taladren, Uregit

Banned

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Definition: Diuretic

Information:

It is used for the treatment of oedema and high blood pressure.
Ethamivan

Clairvan, Corivanil, Romecor, Vandid

Banned

Click to expand

Definition: Respiratory stimulant

Information:

It is used in the treatment of chronic obstructive pulmonary disease, and barbiturate overdose.
Ethamsylate

Aglumin, Altodor, Antihaemorragico Fortuny, Dicinone, Dicynene, Dicynone, Eselin,Haemo 141, Impedil

Banned

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Definition: Haemostatic

Information:

It is used in the treatment of haemorrhages from small blood vessels, and for its prophylactic properties.
Ethanol

Conditionally Permitted

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Definition: Organic compound

Information:

Ethanol may be used in the treatment of orthopaedic disease and as a sedative.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Ethaverine

Cebral, Ethaquin, Ethatab, Ethavex, Isovex, Laverin, Pasmol

Banned

Click to expand

Definition: Vasodilator

Information:

It is used as an anti-arrhythmic.
Ethchlorvynol

Alvinol, Placidil, Placidyl, Serenesil, Serenesil

Banned

Click to expand

Definition: Sedative

Information:

It is used for the treatment of insomnia.
Ethiazide

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Diuretic

Information:

It has similar properties to those of Chlorothiazide.
Ethinamate

Valamin, Valamina, Valaminetta, Valaminettae, Valaminetten, Valmid, Valmidate

Banned

Click to expand

Definition: Sedative

Information:

It is used for the treatment of insomnia.
Ethinylestradiol

Estigyn, Estinyl, Ethinyloestradiol, Feminone, Femodette, Microgynon ED, Primogyn

Banned

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Definition: Oestrogen

Information:

It is used as a contraceptive. In is also uses in the treatment of primary amenorrhoea, and for the palliative treatment of malignant neoplasms of the prostate, and of the breast in postmenopausal women.
Ethoheptazine

Panalgin, Zactane

Banned

Click to expand

Definition: Opiod analgesic

Information:

It is used in the treatment of mild to moderate pain.
Ethopropazine

Lysivane, Parkin, Parsotil, Tomil

Banned

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Definition: Antimuscarinic

Information:

It is used in the treatment of Parkinson's disease.
Ethosuximide

Emeside, Ethosuximide, Ethymal, Petinimid, Petnidan, Pyknolepsinum, Simatin, Suxinutin, Thetamid, Zarodan, Zarontin

Banned

Click to expand

Definition: Anti-epileptic

Information:

It is used in the treatment of abesence seizures.
Ethotoin

Accenon, Peganone, Pegoanone

Banned

Click to expand

Definition: Anticonvulsant

Information:

It is used for the treatment of epilepsy.
Ethoxzolamide

Cardrase, Diuretic C, Ethamide, Redupresin

Banned

Click to expand

Definition: Carbonic anhydrase inhibitor

Information:

It is used as a diuretic, and to treat glaucoma and duodenal ulcers.
Ethyl Aminobenzoate (Benzocaine)

Americaine, Anaesthesin, Anbesol, Baby Anbesol, Bensokain, Capacol, Gengivarium, Hurricaine, Spec-T, Teething Syrup, Topicaine

Conditionally Permitted

Click to expand

Definition: Local anaesthetic

Information:

Ethyl aminobenzoate is used for the temporary local relief of pain.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Ethyl Loflazepate

Victan

Banned

Click to expand

Definition: Anxiolytic

Information:

It is a benzodiazepine, and so has anxiolytic, anticonvulsant, sedative and muscle-relaxant properties. Not approved for use in veterinary medicine. High possibility of affecting performance.
Ethylamphetamine

Apetinil, Apetinil-Depo, Adiparthrol

Banned

Click to expand

Definition: Stimulant

Information:

It is used as an appetite suppressant.
Ethylestrenol

Orabolin, Nandoral

Banned

Click to expand

Definition: Anabolic

Information:

It is an anabolic with a mild androgenic effect.
Ethylisobutrazine

Ethylisobutrazine Hydrochloride Tablets

Banned

Click to expand

Definition: Sedative

Information:

It is used as a neuroleptic tranquiliser.
Ethylmorphine

Cocillana, Codethyline, Dionina

Banned

Click to expand

Definition: Opiod analgesic

Information:

It is used as an antitussive to treat dry coughs and ophthalmology for removing inflammation products from the eyes.
Ethylnorepinephrine

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Bronchodilator

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Etidocaine

Duranest, Etidocaine Hydrochloride

Banned

Click to expand

Definition: Local anaesthetic

Information:

It is used as an anaesthetic in surgical procedures.
Etifoxine

Stresam

Banned

Click to expand

Definition: Anxiolytic

Information:

It is used in the treatment of anxiety disorders, and to promote peripheral nerve healing.
Etilefrine

Circupon, Effontil, Effortil, Eti-Puren, Tonus-Forte-Tablinen

Banned

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Definition: Stimulant

Information:

It is used in the treatment of hypotension.
Etiocholanolone

Banned

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Definition: Anabolic

Information:

A metabolite of testosterone with no legitimate therapeutic indication in the equine athlete.
Etizolam

Depas, Pasaden, Sedekopan

Banned

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Definition: Anxiolytic

Information:

It is used in the treatment of insomnia and anxiety.
Etodolac

Edolan, Etodolac, Lodine, Ultradol, Zedolac

Banned

Click to expand

Definition: Non-steroidal anti-inflammatory drug

Information:

It is used for the treatment of rheumatoid arthritis, mild to moderate pain, fever, and inflammation.
Etodroxizine

Indunox, Isonox

Banned

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Definition: Stimulant

Information:

It is used in the treatment of allergies.
Etomidate

Amidate, Hypnomidate, Sibul

Banned

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Definition: Sedative

Information:

It is used to induce anaesthesia.
Etoricoxib

Algix, Arcoxia, Nucoxia, Tauxib

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

It is used in the treatment of osteoarthritis, ankylosing spondylitis, rheumatoid arthritis, chronic lower back pain, acute pain and gout.
Etorphine

Immobilon,M99

Banned

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Definition: Opiod analgesic

Information:

It is used to immobilise large mammals.
Exemestane

Aromasil, Aromasin, Aromasine, Exemestance, Exemestane, Nikidess

Banned

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Definition: Aromatase inhibitor

Information:

It is used in the treatment of breast cancer.
Famprofazone

Gewodin

Banned

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Definition: Stimulant

Information:

It has analgesic and antipyretic properties.
Febaramate

Trade names are not currently listed on this site.

Banned

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Definition: Muscle relaxant

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Felbamate

Felbamyl, Felbatol, Taloxa

Banned

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Definition: Anticonvulsant

Information:

It is used in the treatment of epilepsy and partial seizures.
Felbinac

Dolinac, Dolonac, Dolo Target, Flexfree, Ledergel, Napagel, Napageln, Selspot, Seltouch, Target, Traxam, Zenol Exum

Conditionally Permitted

Click to expand

Definition: Non-steroidal anti-inflammatory

Information:

Felbinac may be used to relieve pain and inflammation.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Felodipine

Agon, Feloday, Felodur, Felogard, Flodil, Hydac, Modip, Munobal, Penedil, Perfudal, Plandil, Plendil, Preslow, Prevex, Renedil, Splendil

Banned

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Definition: Antihypertensive

Information:

It is used for the treatment of hypertension.
Fenbufen

Bufemid, Cincopal, Cinopal, Lederfen

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

It is used for the treatment of rheumatic disorders.
Fenbutrazate

Filon

Banned

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Definition: Stimulant

Information:

It is used as an anorectic.
Fencamfamine

Euvitol, Glucoenergan, Reactivan

Banned

Click to expand

Definition: Stimulant

Information:

It is used for the treatment of depressive fatigue.
Fencamine

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Stimulant

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Fenclofenac

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Non-steroidal anti-inflammatory drug

Information:

It is used for the treatment of rheumatism with mild immunosuppressive effects.
Fenclozic acid

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Non-steroidal anti-inflammatory drug

Information:

It was withdrawn from study because of hepatotoxicity.
Fenethylline (Fenetylline, Phenethylline, Phenetylline)

Biocapton, Captagon, Fitton

Banned

Click to expand

Definition: Stimulant

Information:

It is used for the treatment of hyperactive children and narcolepsy.
Fenetylline (Fenethylline, Phenethylline, Phenetylline)

Biocapton, Captagon, Fitton

Banned

Click to expand

Definition: Stimulant

Information:

It is used for the treatment of hyperactive children and narcolepsy.
Fenfluramine

Acino, Adipomin, Dima-Fen, Obedrex, Ponderal, Ponderax, Pondimin, Ponflural, Rotondin

Banned

Click to expand

Definition: Stimulant

Information:

It is used as an anorectic agent in the short-term treatment of moderate to severe obesity.
Fenoldopam

Corlopam, Fenoldopam

Banned

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Definition: Vasodilator

Information:

It is used for the treatment of hypertension.
Fenoprofen

Expron, Fenoprofen, Fepron, Nalfon, Nalgesic, Progesic

Banned

Click to expand

Definition: Non-steroidal anti-inflammatory drug

Information:

It is used for the treatment of rheumatoid arthritis, osteoarthritis, and moderate pain.
Fenoterol

Berotec, Fenotrol, Fensol, Partusisten

Conditionally Permitted

Click to expand

Definition: Bronchodilator

Information:

Fenoterol may be used in the treatment of respiratory diseases.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Fenozolone

Ordinator

Banned

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Definition: Psychoactive

Information:

It is used for the treatment of symptoms of intellectual impairment and memory disorders.
Fenpiprane

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Gastrointestinal disorders

Information:

It is used for the treatment of gastrointestinal disorders.
Fenproporex

Antiobes Retard, Appetitzügler, Dicel, Falagan, Gacilin, Grasmin, Lineal, Perphoxene, Solvolip, Tegisec

Banned

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Definition: Stimulant

Information:

It is used for the treatment of obesity.
Fenspiride

Decaspir, Espiran, Eurespal, Fenspin, Fenspir, Fluiden, Pneumorel, Respiride, Viarespan

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

It is used for the treatment of various respiratory diseases.
Fentanyl

Actiq, Duragesic, Fentanest, Fentatil, Fentanyl, Pentanyl, Sentonil, Sublimaze

Conditionally Permitted

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Definition: Opioid

Information:

Fentanyl may be used to relieve pain.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Fentiazac

Domureuma, Donorest, Fentac, Flogene, Norvedan, Riscalon

Banned

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Definition: Pain relief

Information:

It is used for the treatment of rheumatic and inflammatory disorders.
Feprazone

Analud, Brotazona, Cocresol, Danfenona, Grisona, Impriemial, Methrazone, Naloven, Nessazona, Nilatin, Prenakes, Prenazon, Rangozona, Represil, Tabrien, Zepelin

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

It is used for the treatment of rheumatic disorders.
Fexofenadine

Allegra, Fexofenadine, Fexotabs, Kalicet, Telfast BD

Conditionally Permitted

Click to expand

Definition: Antihistamine

Information:

Fexofenadine may be used in the control of allergies.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Firocoxib

Equioxx, Previcox

Permitted

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Definition: Non-steroidal anti-inflammatory

Information:

Firocoxib may be used to relieve pain and inflammation.

The detection time is estimated with 336 hours (14 days) after oral administration.

A detection time is not the same as a withdrawal time. The detection time is the approximate period of time for which a substance (or its metabolite) remains in a horse's system such that it can be detected by the laboratory. The withdrawal time for a substance adds a safety margin, chosen with professional judgment and discretion to allow for individual differences between horses such as size, metabolism, degree of fitness, recent illness or disease etc.. You are advised to seek suitable advice from your treating veterinarian.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

The maximum permitted plasma concentration of Firocoxib is 0.240 micrograms per milliliter.

When firocoxib is administered, the dose should be accurately calculated according to the actual weight of the horse. Every 24 hours, not more than 0.0455 mg per pound of body weight should be administered. For a 1000-pound horse, the maximum daily dose is 45.5 mg, which equals four markings on the dosing syringe that contains the medication and is supplied by the manufacturer. Doses should be given 24 hours apart. No part of a dose should be administered during the 6 hours prior to competing. Any medicated feed must be consumed and/or removed at least 6 hours prior to competing. The maximum treatment time for firocoxib is 14 successive days.

To avoid a stacking of NSAIDs violation under NRHA Medication Rules, only a single NSAID should be administered within 3 days (72 hours) of showing the horse.

Example: If your horse is on Banamine (Flunixin) prior to the show and you plan to switch to Phenylbutazone ("Bute") at the show, you should discontinue administering Banamine at least 72 hours prior to show time.
Flavoxate

Genurin, Spasuret, Urispadol, Urispas

Banned

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Definition: Antispasmodic

Information:

It is used for the treatment and symptomatic relief of some lower urinary tract disorders.
Flecainide

Almarytm, Flecaine, Flecainide, Tambocor

Banned

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Definition: Anti-arrhythmic

Information:

It is used for the treatment of a variety of cardiac arrhythmias.
Floctafenine

Apo-Floctafenine, Diralgan, Idalon, Idarac, Novodolan

Banned

Click to expand

Definition: Non-steroidal anti-inflammatory drug

Information:

It is used for the treatment of mild to moderate pain.
Fluandrenolide (Fluandrenolone, Fludroxycortide)

Alondra-F, Cordran tape, Drenison, Haelan tape, Sermaka

Banned

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Definition: Corticosteroid

Information:

It is used for the treatment of skin disorders.
Fluandrenolone (Fluandrenolide, Fludroxycortide)

Alondra-F, Cordran tape, Drenison, Haelan tape, Sermaka

Banned

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Definition: Corticosteroid

Information:

It is used for the treatment of skin disorders.
Fluanisone

Anti-Pica, Metorin, Sedalande

Banned

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Definition: Sedative

Information:

It is used as a tranquiliser for animals in combination with Fentanyl.
Fludiazepam

Erispan

Banned

Click to expand

Definition: Anxiolytic

Information:

It is used for the treatment of anxiety disorders.
Fludrocortisone (Fluorocortisone)

Alflorone, Astonin, F-Col, F-Cortef, Florinef, Fludrone, Fluohydrisone, Fludrocortisone

Banned

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Definition: Corticosteroid

Information:

It is used for the treatment of cerebral salt wasting, adrenal insufficiency, and orthostatic intolerance.
Fludroxycortide (Fluandrenolide, Fluandrenolone)

Alondra-F, Cordran tape, Drenison, Haelan tape, Sermaka

Banned

Click to expand

Definition: Corticosteroid

Information:

It is used for the treatment of skin disorders.
Flufenamic acid

Ansatin, Arlef, Meralen, Parlef, Sastridex, Surika

Banned

Click to expand

Definition: Non-steroidal anti-inflammatory drug

Information:

It is used for the treatment of rheumatic disorders.
Flumetasone (Flumethasone)

Locacorten, Locorten, Locortene

Conditionally Permitted

Click to expand

Definition: Corticosteroid

Information:

Flumetasone is used for the treatment of various skin disorders.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Flumethasone (Flumetasone)

Locacorten, Locorten, Locortene

Conditionally Permitted

Click to expand

Definition: Corticosteroid

Information:

Flumethasone is used for the treatment of various skin disorders.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Flumethazide

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Diuretic

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Flunarizine

Flerudin, Flunagen, Flurpax, Fluxarten, Gradient, Issium, Sibelium, Vasculene

Banned

Click to expand

Definition: Antihypertensive

Information:

It is used as an inhibitor of peripheral and central vasoconstriction.
Flunisolide

AeroBid, Bronalide, Bronilide, Gibiflu, Locasyn, Lokilan, Nasalide, Rhinalar, Syntaris

Banned

Click to expand

Definition: Corticosteroid

Information:

It is used for the treatment of allergic rhinitis.
Flunitrazepam

Darkene, Flunipam, Noriel, Primum, Rohypnol, Roipnol, Valsera

Banned

Click to expand

Definition: Anxiolytic

Information:

It is used for the treatment of insomnia.
Flunixin Meglumine

Banamine, Citation, Cronyxin, Finadyne, Flumevet LA, Flunazine, Flunixin, Influx-50, Meflosyl, Suppressor, Supressor

Permitted

Click to expand

Definition: Non-steroidal anti-inflammatory

Information:

Flunixin may be used to relieve pain, inflammation and control fever.

The detection time is estimated with 144 hours (6 days) after intra-venous administration.

A detection time is not the same as a withdrawal time. The detection time is the approximate period of time for which a substance (or its metabolite) remains in a horse's system such that it can be detected by the laboratory. The withdrawal time for a substance adds a safety margin, chosen with professional judgment and discretion to allow for individual differences between horses such as size, metabolism, degree of fitness, recent illness or disease etc.. You are advised to seek suitable advice from your treating veterinarian.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

The maximum permitted plasma concentration of Flunixin is 1.0 micrograms per milliliter.

When flunixin meglumine is administered, the dose should be accurately calculated according to the actual weight of the horse. Every 24 hours, no more than 0.5 milligrams per pound of body weight should be administered. For a 1000-pound horse, the maximum daily dose is 500 milligrams, which equals two 250 milligram packets of granules, or one 500 milligram packet of granules or 500 milligrams of the oral paste, or 10.0 cc of the injectable (50 milligrams per milliliter). If giving twice daily each administration should be 12 hours apart. No part of a dose should be administered during the 6 hours prior to competing. Any medicated feed must be consumed and/or removed at least 6 hours prior to competing. The maximum treatment time for flunixin meglumine is five successive days.

To avoid a stacking of NSAIDs violation under NRHA Medication Rules, only a single NSAID should be administered within 3 days (72 hours) of showing the horse.

Example: If your horse is on Banamine (Flunixin) prior to the show and you plan to switch to Phenylbutazone ("Bute") at the show, you should discontinue administering Banamine at least 72 hours prior to show time.
Fluocinolone

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Corticosteroid

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Fluocinolone acetonide

Adermina, Boniderma, Capex, Cervicum, Cinotec, Cortalar, Cortilona, Dermalar, Dermofil, Elasven, Fluciderm, Flucort, Fluocinolone, Gelidina, Isnaderm, Localyn, Neoflu, Percutina, Sinalar, Synamol, Topifluor

Banned

Click to expand

Definition: Corticosteroid

Information:

It is used for the treatment of various skin disorders.
Fluocinonide

Bestasone, Cusigel,Flu-21, Fluocinonide, Klariderm, Lidemol, Lidex, Lyderm, Metosyn, Novoter, Topsym, Topsymin, Topsyne

Banned

Click to expand

Definition: Corticosteroid

Information:

It is used for the treatment of various skin disorders.
Fluocortolone

Syracort, Ultracur, Ultradil, Ultralan, Ultralanum, Ultralanum Plain

Banned

Click to expand

Definition: Corticosteroid

Information:

It is used for the treatment of various skin disorders.
Fluopromazine (Triflupromazine)

Psyquil, Siquil, Vesprin

Banned

Click to expand

Definition: Antipsychotic

Information:

It is used for the management of psychosis, and the control of nausea and vomiting.
Fluoresone

Caducid

Banned

Click to expand

Definition: Anti-epileptic

Information:

It is used for the treatment of neuropsychiatric disorders.
Fluorocortisone (Fludrocortisone)

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Corticosteroid

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Fluorometholone

Cortilet, Cortisdin, Delmeson, Efflumidex, Fluaton, Flucon, Flumetholon, Flumetol semplice, FML, FML Liquifilm, Isopto-Flucon, Lerna, Oxylone, Ursnon

Banned

Click to expand

Definition: Corticosteroid

Information:

It is used for the treatment of allergic and inflammatory conditions of the eye.
Fluorophenethylamine

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Stimulant

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Fluoroprednisolone

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Corticosteroid

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Fluoxetine

Adofen, Animex-On, Deprex, Eufor, Fluctin, Fluoxetine, Fluval, Fontex, Foxetin, Portal, Prozac, Pulvules, Reneuron, Sarafem

Banned

Click to expand

Definition: Antidepressant

Information:

It is used for the treatment of depression, bulimia nervosa, and obsessive-compulsive disorder.
Fluoxymesterone

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Anabolic

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Flupenthixol

Depixol, Emergil, Fluanxol

Banned

Click to expand

Definition: Antidepressant

Information:

It is used for the treatment of depression and schizophrenia.
Fluphenazine

Anatensol, Dapotum D, Modecate, Moditen, Omca, Pacinol, Permitil, Prolixin, Sevinol, Siqualone

Banned

Click to expand

Definition: Antipsychotic

Information:

It is used for the treatment of mental or mood disorders, as well as schizophrenia.
Flupirtine

Flupirtine, Katadolon, Metanor, Trancopal Dolo

Banned

Click to expand

Definition: Analgesic

Information:

It is used for the treatment of moderate pain.
Fluprednisolone (Flouroprednisolone)

Alphadrol, Etadrol, Isopredon, Selectren, Vladicort

Banned

Click to expand

Definition: Corticosteroid

Information:

It is used for the treatment of various inflammatory rashes.
Flurazepam

Dalmadorm, Dalmane, Flurazepam, Fordrim, Midorm AR, Novo-Flupam, Paxane, Somnol, Som-Pam, Staurodorm, Valdorm

Banned

Click to expand

Definition: Anxiolytic

Information:

It is used for the treatment of insomnia.
Flurbiprofen

Ansaid, Cebutid, Flugalin, Flurofen, Froben, Tulip

Banned

Click to expand

Definition: Non-steroidal anti-inflammatory drug

Information:

It is used for the treatment of rheumatic disorders.
Fluspirilene

Fluspi, Imap, Imap Forte, Kivat, Redeptin

Banned

Click to expand

Definition: Antipsychotic

Information:

It is used for the treatment of schizophrenia.
Fluticasone

Cutivate, Flixonase, Flixotide, Flonase, Flovent, Flovent Diskus, Fluticasone, Flutivate

Conditionally Permitted

Click to expand

Definition: Corticosteroid

Information:

Fluticasone is used in the treatment of asthma, and as a topical anti-inflammatory agent.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Flutoprazepam

Flutoprazepam Tablets

Banned

Click to expand

Definition: Anxiolytic

Information:

It is used for the treatment of severe insomnia, anxiety, and stomach ulcers.
Fluvoxamine

Faverin, Fevarin, Floxyfral, Fluvoxamina, Fluvoxamine, Luvox, Myroxine, Voxam

Banned

Click to expand

Definition: Antidepressant

Information:

It is used for the treatment of depression and obsessive–compulsive disorder.
Formebolone

Esiclene, Hubernol

Banned

Click to expand

Definition: Anabolic

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Formestane

Lentare, Lentaron

Banned

Click to expand

Definition: Aromatase inhibitor

Information:

It is used for the treatment of breast cancer.
Formoterol

Atock, Foradil, Oxeze Turbuhaler, Oxis Turbohaler

Conditionally Permitted

Click to expand

Definition: Bronchodilator

Information:

Formoterol may be used in the treatment of respiratory diseases.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Fosinopril

Fosinil, Fosinopril, Monopril, Secorvas, Staril, Vasopril

Banned

Click to expand

Definition: Antihypertensive

Information:

It is used for the treatment of hypertension and chronic heart failure.
Fosphenytoin

Cerebyx, Cereneu, Fosphenytoin, Prodilantin, Pro-Epanutin

Banned

Click to expand

Definition: Anticonvulsant

Information:

It is used for the treatment of severe seizures, and to prevent and treat seizures which may occur during brain or nervous system surgery.
Fulvestrant

Faslodex

Banned

Click to expand

Definition: Anti-oestrogenic

Information:

It is used in the treatment of metastatic breast cancer (specially postmenopause). Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Furazabol

Miotolan, Miotolon

Banned

Click to expand

Definition: Anabolic

Information:

It is a derivative of the anabolic steroid, Stanozolol.
Furazadrol

Banned

Click to expand

Definition: Anabolic

Information:

A synthetic anabolic steroid with no legitimate therapeutic indication in the equine athlete.
Furfenorex

Frugalan

Banned

Click to expand

Definition: Stimulant

Information:

It is used for the treatment of obesity.
Furosemide

Diural, Diurolasa, Frusid, Furosemide, Impugan, Lasix, Novosemide, Salix, Sigasalur, Urex

Permitted

Click to expand

Definition: Diuretic

Information:

Furosemide may be used in the control of exercise-induced pulmonary haemorrhage, hypotension and oedema.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

The maximum permitted plasma concentration of Furosemide is 10 nanograms per milliliter.

When furosemide is administered, the dosage should be accurately calculated according to the weight of the horse. Every 24 hours, the dose should not exceed 500 milligrams. When used, furosemide must be administered intravenously at least four 4 hours prior to competition. Furosemide should not be administered for more than five successive days.
Gabapentin

Aclonium, Gabapentin, Neurontin, Normatol, Novo-Gabapentin

Conditionally Permitted

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Definition: Anticonvulsant

Information:

Gabapentin may be used in the control of seizures and pain.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Galantamine

Galantamine, Jilkon, Lycoremin, Nivalin, Reminyl

Banned

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Definition: Alzheimer medication - alkaloid

Information:

It is used for the treatment of moderate to mild Alzheimer's typedementia.
Gallamine

Flaxedil

Banned

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Definition: Muscle relaxant

Information:

May be used to decrease severity of muscular spasms in tetanus, spastic paraplegia and other convulsive states. Not approved for use in veterinary medicine. Rarely used in equine medicine. High possibility of affecting performance.
Gamma amino butyric acid (GABA)

Carolina Gold

Banned

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Definition: Inhibitory neurotransmitter
Gamma-Butyrolactone (GBL)

Prodrug of Gamma-butyrolactone (GHB)

Banned

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Definition: Sedative

Information:

Prodrug of Gamma-butyrolactone (GHB)
Gamma-Hydroxybutyrate (GHB)

Banned

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Definition: Sedative

Information:

Also known as 4-hydroxybutanoic acid, is a naturally occurring substance found in the human central nervous system, as well as in wine, beef, small citrus fruits, and almost all animals in small amounts. It is also categorized as an illegal drug in many countries. It is currently regulated in Australia and New Zealand, Canada, most of Europe and in the US. GHB as the sodium salt, known as sodium oxybate (INN) or by the trade name Xyrem, is used to treat cataplexy and excessive daytime sleepiness in patients with narcolepsy. Gamma-Butyrolate (GBL) is a prodrug.
Gepirone

Ariza, Variza

Banned

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Definition: Anxiolytic

Information:

Anxiolytic and anti-depressant. Not approved for veterinary use. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Gestrinone

Dimetriose, Dimetrose, Nemestran

Banned

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Definition: Anabolic

Information:

A synthetic steroid hormone that acts as an antiprogestin and also has some androgenic activity. It is marketed as a treatment for endometriosis. Gestrinone is available in many countries, but not in the USA. As it has anabolic effects,its use in competition has been banned by the International Olympic Committee. The derivative tetrahydrogestrinone (THG) was also banned by the Food and Drug Administration (FDA) in 2003. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Glutethimide

Doriden

Banned

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Definition: Sedative

Information:

Glutethimide is a Schedule II drug under the Convention on Psychotropic Substances in the USA. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Glycopyrrolate

Asecryl, Glycopyrrolate, Nodapton, Robinul, Tarodyl, Tarodyn

Conditionally Permitted

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Definition: Anticholinergic

Information:

Glycopyrrolate may be used to reduce secretions before anaesthesia and in the treatment of asthma and abnormal heart rhythms.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Grapiprant

Galliprant

Conditionally Permitted

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Definition: Non-steroidal anti-inflammatory

Information:

Grapiprant may be used to relieve pain and inflammation.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Growth Factors

Chemicon

Banned

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Definition: Growth promotion

Information:

The product is for research-purposes only. A growth factor is a naturally occurring substance capable of stimulating cellular growth. There are many families, but insulin-like growth factor is the most predominant somatomedin, or growth factor hormone, and is thought to have anabolic effects. It is measured as an indicator of Growth Hormone abuse in racehorses.
Growth Hormone (GH) - or analogues

EquiGen

Banned

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Definition: Growth Promotion

Information:

Equine growth hormone (eGH) is available as an approved drug containing recombinant eGH (reGH). It is registered for improvement of nitrogen balance in horses aged over 15 years. It is suspected of being illegally administered to racehorses to improve physical performance and speed up wound healing.
Guaifenesin

Actifed CC Chesty, Balminil Expectorant, Benylin, Bronchol, Calcough Chesty, Duratuss G, Formulaexpec, Glyate, Larylin Lozenges, Myocaine, PV Tussin, Resyl, Robitussin, Sudafed Cough, Tedral Expectorant, Vicks Acta Plus Expectorant, Wick Formel 44 Husten-Loser

Conditionally Permitted

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Definition: Expectorant

Information:

Guaifenisin may be used in the treatment of respiratory disease and as a muscle relaxant during anaesthesia.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Guanabenz

Wytensin

Banned

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Definition: Sedative

Information:

Used to treat high blood pressure in humans. Guanabenz has reportedly been administered to race horses,and is classified by the International Association of Racing Commissioners as a class 3 foreign substance. The rationale for this administration is to reduce pulmonary blood pressure,thereby reducing the incidence and severity of exercise induced pulmonary hemorrhage (EIPH). As an a2 agonist agent, Guanabenz may have the ability to tranquilise or sedate a horse, relieve pain, and may also have some bronchodilator effect.
Guanadrel

Hylorel

Banned

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Definition: Antihypertensive

Information:

Guanadrel is a human antihypertensive drug that blocks the release of norepinephrine, normally produced by nerve stimulation. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Guanethidine

Dopom, Ismelin, Ismeline, Visutensil

Banned

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Definition: Antihypertensive

Information:

An antihypertensive medicine that also has an effect on chronic pain. Guanethidine reduces the release of catecholamines, such as noradrenaline, from the cells. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Guanoclor

Vatensol

Banned

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Definition: Sympatholytic

Information:

As an antihypertensive also used to treat chronic pain. It has not been approved for use in veterinary medicine, for example by the US Food and Drug Administration, or any EU countriy. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Guanoxan

Envacar

Banned

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Definition: Sympatholytic

Information:

Antihypertensive also used to treat chronic pain. It has not been approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
GW1516

Endurobol, Cardarine

Banned

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Definition: Metabolic Modulator

Information:

GW1516 increases the horse's exercise capacity. It increases metabolism in skeletal muscles to burn fat and increase muscle mass. The substance was initially developed to treat metabolic and cardiovascular disease but later found to be carcinogenic.
Haemaglobin analogues

Hemopure, Oxyglobin

Banned

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Definition: Oxygen transport

Information:

Oxyglobin is approved for the treatment of anemia in dogs in both Europe, and the USA. Not registered for use in horses. Human product Hemopure has not been able to gain approval in the UK or the USA because of safety and reliability concerns at the European Commission and the Food and Drud Administration (FDA), respectively.
Halcinonide

Halog

Banned

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Definition: Corticosteroid

Information:

A synthetic corticosteroid for human use. It is indicated for topical application to relieve inflammatory manifestations of acute or chronic corticosteroid responsive dermatoses (skin conditions).
Halobetasol

Ultravate

Banned

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Definition: Corticosteroid

Information:

Halobetasol cream and ointment are high potency topical corticosteroids indicated for the relief of skin inflammation in humans. Not registered for use in horses.
Halodrol

Banned

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Definition: Anabolic

Information:

A synthetic anabolic-androgenic steroid with no legitimate therapeutic indication in the equine athlete.
Haloperidol

Aloperidin, Bioperidolo, Brotopon, Dozic, Duraperidol, Einalon S, Eukystol, Haldol, Halosten, Keselan, Linton, Peluces, Serenace, Serenase, Sigaperidol

Banned

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Definition: Neuroleptic

Information:

Haloperidol is a human medicine with antipsychotic properties considered particularly effective in the management of hyperactivity, agitation and mania. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Harmaline

Trade names are not currently listed on this site.

Banned

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Definition: Psychoactive

Information:

Central nervous system stimulant extracted from plants. No medicinal use. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Harpagoside (Devils claw)

Devil's Claw, NoBute, Devil's Relief, Nil-Bute

Banned

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Definition: Analgesic

Information:

Harpagoside is the active substance in Devil's Claw and may be used to relieve pain and inflammation.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Heptaminol

Coreptil, Eoden, Heptaminol, Hept-A-Myl, Heptylon, Myolytril

Banned

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Definition: Stimulant

Information:

Heptaminol dilates blood vessels, and is therefore suggested for treating low blood pressure in humans. Not approved for use in veterinary medicine.
Heroin (Diamorphine)

Diamorf, Diamorphine, Diaphin

Banned

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Definition: Narcotic

Information:

It is used in the treatment of severe pain, myocardial infarction, acute pulmonary oedema, and chronic pain.
Hexafluorenium

Mylaxen, Milaxen

Banned

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Definition: Muscle relaxant

Information:

Neuromuscular blocking agent used in anaesthesiology in humans. Not commercially available in USA or EU. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Hexobarbital

Barbidorm, Citopan, Cyclonal, Cyclopan, Enhexymal, Enhexymalum, Evipal, Hexanastab, Hexenal, Methexenyl, Narcosan, Narcosan Soluble, Noctivane, Novopan, Privenal, Sombucaps, Sombulex, Somnalert

Banned

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Definition: Sedative

Information:

Hexobarbital is a barbiturate with hypnotic and sedative effects. It was used previously for inducing anaesthesia for surgery. It is effective relatively quickly, and active for a short duration. It has been replaced with safer drugs and is only used for research purposes nowadays. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Hexocyclium

Tral, Traline

Banned

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Definition: Antimuscarinic

Information:

Suggested use for treating peptic ulcers in humans, in conjunction with other treatments. May also have potential for use in the treatment of equine peptic ulcers but this has not been reported or studied yet.
Hexylcaine

Cyclaine

Banned

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Definition: Local anaesthetic

Information:

Topical short term local anaesthetic.
Histapyrrodine

Domistan

Banned

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Definition: Antihistamine

Information:

An antihistamine with possible sedative effect. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.

Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Homatropine

Isopto Homatropine, Hycodan, Tussigon

Banned

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Definition: Anticholinergic

Information:

An anticholinergic drug used in its bromide form to dilate the pupil of the eye, and in combination with hydrocodone to prevent overdosage of that drug. Also called mandelytropine it is used in combination with cough medicines because homatropine helps to dry up nasal and breathing passages. It also relieves gastrointestinal spasms.
Homophenazine

Trade names are not currently listed on this site.

Banned

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Definition: Psychiatric drug

Information:

Not commercially available for medicinal use. For research purposes only. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Hordenine

Victan

Conditionally Permitted

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Definition: Stimulant

Information:

Hordenine can be found in a number of grassy plants, grains and some species of cactus. The substance may stiumulate the central nervous system..

Hordenine is a Specified Substance. Specified Substances should not in any way be considered less important or less dangerous than other Prohibited Substances. Rather, they are simply substances which are more likely to have been ingested by Horses for a purpose other than the enhancement of sport performance, for example, through a contaminated food substance.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Huperzine A

HupA, Selagine

Banned

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Definition: Acetylcholinesterase inhibitor

Information:

Huperzine A is used to increase alertness and treat myasthenia gravis. It has no legitimate use in the treatment of sports horses.
Hydralazine

Apresolin, Furlazin, Nepresol, Pressalin

Banned

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Definition: Vasodilator; afterload reducer

Information:

Hydralazine hydrochloride is a smooth muscle relaxant that causes a drop in blood pressure by relaxing the musculature in the arteries. The sale of this drug has been discontinued in some countries. May have an indication in treating equine cardiac failure, but this has not been critically investigated. Not approved for use in equine medicine. No legitimate therapeutic indication in the equine athlete.
Hydrochlorothiazide (Hydrochlorthiazide)

Adelphan, Dichlotride, Diurex, Esidrex, Hydrochlorothiazide, Hydro-Diuril, HydroSaluric, Novo-Hydrazide, Thiuretic

Conditionally Permitted

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Definition: Diuretic

Information:

Hydrochlorothiazide (hydrochlorthiazide) may be used in the control of hypotension and oedema

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Hydrochlorthiazide (Hydrochlorothiazide)

Adelphan, Dichlotride, Diurex, Esidrex, Hydrochlorothiazide, Hydro-Diuril, HydroSaluric, Novo-Hydrazide, Thiuretic

Conditionally Permitted

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Definition: Diuretic

Information:

Hydrochlorthiazide (hydrochlorothiazide) may be used in the control of hypotension and oedema.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Hydrocodone

Hycodan, Anexsia, Duradyne, Hycodan, Hycomine, Codamine

Banned

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Definition: Opiod analgesic

Information:

A semi-synthetic opioid that is used as an analgesic, and as a cough supressant in humans. Not approved for use in veterinary medicine. High possibility of affecting performance.
Hydrocortisone

Alfacort, Aquanil HC, Bactine, Barriere HC, Calmicort, Cortate, Dermacort, Egocort, Hycort, Hydrocortisone, Hydrosone, Mildison, Nutracort, Proctocort, Schericur, Synacort, Texacort

Conditionally Permitted

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Definition: Corticosteroid

Information:

Hydrocortisone is used for the treatment of severe allergic reactions and various endocrine and skin disorders.

Hydrocortisone is a Threshold Substance.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Hydroflumethiazide

Saluron, Diucardin, Hydroflumethiazide

Banned

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Definition: Diuretic

Information:

Used for treating oedema in humans. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Hydromorphinol

Numorphan

Banned

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Definition: Opiod analgesic

Information:

It has similar effects to morphine such as sedation, analgesia and respiratory depression, but is more potent. Not commercially available for medicinal use in most countries.
Hydromorphone

Palladone, Palladon, Dilaudid

Banned

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Definition: Opiod analgesic

Information:

It has similar effects to morphine such as sedation, analgesia and respiratory depression, but is five times more potent. It is not a veterinary drug, but is sometimes used in pain management in dogs. Its use in pain management of horses as an an epidural injection has been investigated.
Hydroxy-gamma amino butyric acid (Hydroxy-GABA)

Banned

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Definition: Inhibitory neurotransmitter
Hydroxyamphetamine

Paredrine, Paremyd

Banned

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Definition: Stimulant

Information:

Used in ophtalmic topical mydriatic combination products. Hydroxyamphetamine is an indirectly acting sympathomimetic agent which, when applied topically to the eye, causes the release of endogenous norepinephrine, resulting in mydriasis. The use of this substance is indicated for mydriasis in routine diagnostic procedures and in conditions where short term pupil dilation is desired. Not approved for systemic (injection) use. Possible side effects include psychotic reactions, behavioural disturbances and vasomotor or cardio-respiratory collapse, which have been reported with the use of anticholinergic drugs in humans.
Hydroxyephedrine (Oxilofrine)

Trade names are not currently listed on this site.

Banned

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Definition: Stimulant

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Hydroxytestosterone

Trade names are not currently listed on this site.

Banned

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Definition: Anabolic

Information:

A group of testosterone metabolites. Used for laboratory research only, not in medicinal use. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Hydroxyzine

Alamon, Atara, Ataraxoid, Atarazoid, Atarox, Deinait, Durrax, Equipose, Fasarax, Hychotine, Neo-Calma, Neurozina, Nevrolaks, Pamazone, Paxistil, Placidol, Plaxidol, Tran-Q, Tranquizine, Traquizine, Vesparaz, Vesparaz-Wirkstoff

Conditionally Permitted

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Definition: Antihistamine

Information:

Hydroxyzine may be used in the It is used for the control of itchiness related to allergies in horses. Its active metabolite is cetirizine, a Controlled Medication Substance.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Hyoscine (Scopolamine)

Transderm-scop, Scopoderm

Conditionally Permitted

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Definition: Anticholinergic

Information:

Hyoscine may be used in the treatment of gastrointestinal tract spams such as colic.

Hyoscine (Scopolamine) is a Specified Substance. Specified Substances should not in any way be considered less important or less dangerous than other Prohibited Substances. Rather, they are simply substances which are more likely to have been ingested by Horses for a purpose other than the enhancement of sport performance, for example, through a contaminated food substance.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Hyoscyamine (Atropine isomer)

Levsin, Buscopan

Banned

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Definition: Anticholinergic

Information:

Hyoscyamine is an anticholinergic used in the treatment of various gastrointestinal disorders including spasms, peptic ulcers, irritable bowel syndrome, pancreatitis, colic and cystitis, for the relief of symptoms. Commonly used in equine medicine to treat colics.
Ibandronate

Boniva, Bondronat, Bonviva, Idandrix, Adronil, Bondrova, Bonprove

Banned

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Definition: Bone metabolism agent

Information:

A bisphosphonate drug used for the treatment of osteoporosis, fractures associated with cancer and hypercalcaemia. It is considered a risk to equine welfare and has no legitimate therapeutic indication in the equine athlete.
Ibogaine

Trade names are not currently listed on this site.

Banned

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Definition: Psychoactive indole

Information:

Ibogaine is a psychoactive indole alkaloid derived from the rootbark of an African plant. In large doses it can induce a dreamlike state for a period of hours. Ibogaine's current legal status in the UK, and much of the world, is that of an unlicensed, experimental medication. Ibogaine is a restricted substance (i.e. possession is illegal) in some countries, including the USA, Switzerland, Denmark, Sweden and Belgium. It is researched for its properties in treating alcohol and drug addictions. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Ibuprofen

Actiprofen, Bifen, Brugesic, Burana, Dolgit, Faspic, Ibufen, Ibugel, Ibuleve, Ibumax, Ibumed, Ibuprofen, Ibusal, Ibumetin, Ibutop, Junifen, Nurofen, Perofen, Rupan, Solufen

Conditionally Permitted

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Definition: Non-steroidal anti-inflammatory

Information:

Ibuprofen may be used to relieve pain, inflammation and control fever.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Ibutilide

Corvert

Banned

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Definition: Anti-arrhythmic

Information:

A class III anti-arrhythmic agent used in the treatment of atrial fibrillation. Its use has not been described in horses, however it could be potentially effective.
Iloprost

Ilomedine, Ventavis

Banned

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Definition: Vasodilator

Information:

Iloprost is a synthetic analogue of prostacyclin PGI2 which dilates arterial blood vessels. The drug is used in humans to treat pulmonary arterial hypertension (PAH), scleroderma, and ischaemia.
Imipramine

Tofranil

Banned

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Definition: Antidepressant

Information:

Imipramine is a human antidepressant of the tricyclic class. Imipramine has been used to treat horses with narcolepsy and urospermia, although not approved for these indications, or any other indications for this species. It is also studied for use in pharmacologically induced ejaculation in stallions. High possibility of affecting performance.
Indacaterol

Sequadra, Onbrez Breezhaler, Ultibro Breezhaler, Enerair Breezhaler, Arcapta Neohaler

Conditionally Permitted

Click to expand

Definition: Bronchodilator

Information:

Indacaterol may be used in the treatment of respiratory diseases.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Indapamide

Indapamide, Natrilix, Coversyl comp

Banned

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Definition: Diuretic

Information:

Used for treating oedema in humans. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Indomethacin

Confortid, Elmetacin, Imbrilon, Indocid, Indocin, Indocin-SR, Indochron E-R, Indometacin, Indomod

Conditionally Permitted

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Definition: Non-steroidal anti-inflammatory

Information:

Indomethacin may be used to relieve pain and inflammation.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Indoprofen

Flosin, Flosint, Isindone, Reumofen

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

Not commerically available (withdrawn from the market). Used as a painkiller. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Indoramin

Doralese, Baratol

Banned

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Definition: Antihypertensive

Information:

An alpha-antagonist that is used for many diseases in humans, for example hypertension. Sedation and drowsiness may occur as side effects. No legitimate therapeutic indication in the equine athlete. Moderate possibility of affecting performance.
Infliximab

Remicade

Banned

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Definition: Therapeutic antibody

Information:

Infiliximab is a synthetic antibody against an inflammatory mediator in tissues, as well as some inflammatory cells. It is used in some human auto-immune diseases like psoriasis, rheumatoid arthiritis and Crohn's disease, to lower the inflammatory response of the body. Not approved for use in veterinary medicine. May have some indications for use in equine inflammatory conditions, but has not been studied yet. Possibility to impact performance is high.
Ipratropium

Aerovent, Apo-Ipravent, Apovent, Atronase, Atrovent, Bitrop, Disne Asmol, Ipratropium, Kendral-Ipratropium, Narilet, Rhinotrop, Rhinovent, Rinatec, Rinoberen, Rinovagos, Vagos

Conditionally Permitted

Click to expand

Definition: Bronchodilator

Information:

Ipratropium may be used in the treatment of respiratory diseases.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Iprindole

Galatur, Prondol, Tertran

Banned

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Definition: Antidepressant

Information:

Iprindole is a human antidepressant of the tricyclic class. No legitimate therapeutic indication in the equine athlete. Potential to influence performance is high.
Iproniazid

Marsilid, Iprozid, Ipronid, Rivivol, Propilniazida

Banned

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Definition: Antidepressant

Information:

Iproniazid is a human antidepressant. No legitimate therapeutic indication in the equine athlete. Potential to influence performance is high.
Ipsapirone

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Anxiolytic

Information:

An anxiolytic and antidepressant used in research only. No legitimate therapeutic indication in the equine athlete. Possibility to affect performance is high.
Irbesartan

Aprovel, Karvea, Avapro

Banned

Click to expand

Definition: Antihypertensive

Information:

Used for lowering blood pressure and treating kidney disease in humans with high blood pressure and diabetes mellitus. Not approved for use in veterinary medicine.
Isoaminile

Peracon

Banned

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Definition: Antitussive

Information:

Isoaminile suppresses the cough reflex. May cause dizziness and have other central nervous system effects with large doses. Not registered for veterinary use.
Isocarboxazid

Marplan

Banned

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Definition: Antidepressant

Information:

Isocarboxazid is a human antidepressive. In the United States, isocarboxazid is approved for the treatment of human depression, anxiety (panic disorder), with or without agoraphobia. No legitimate therapeutic indication in the equine athlete. Potential to influence performance is high. In the United Kingdom, isocarboxazid is licensed for the treatment of depression unresponsive to other types of antidepressives.
Isoetharine

Bronkosol

Banned

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Definition: Beta 2 adrenergic receptor agonist

Information:

Used to prevent and treat bronchospasms in persons with certain lung diseases, like asthma. Not commercially available in the United States or EU. No legitimate therapeutic indication in the equine athlete.
Isoflupredone

Predef, isofluprednisolone

Conditionally Permitted

Click to expand

Definition: Corticosteroid

Information:

Isoflupredone may be used in the treatment of inflammatory skin diseases.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Isomethadone

Isomethadone I

Banned

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Definition: Analgesic

Information:

A narcotic analgesic. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Isometheptane

Isonyl, Midrin, Midrid, Octanil, Octon

Banned

Click to expand

Definition: Stimulant

Information:

It is a cardiac and respiratory stimulant which also causes constriction (narrowing) of blood vessels. It is used in the treatment of migraines and tension headaches, in combination with painkillers. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Isometheptene

Midrin, Amidrine

Banned

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Definition: Sympathomimetic

Information:

Isometheptene restricts blood flow by narrowing the blood vessels, and is therefore used in tension headaches and migraines, in combination with other substances like paracetamol. Not approved for use in equine medicine. No legitimate therapeutic indication in the equine athlete.
Isoprenaline (Isoprotorenol)

Isuprel

Banned

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Definition: Bronchodilator

Information:

It is closely related to epinephrine. Its primary use is for bradycardia, or heart block, or as an inhalor drug for asthma in humans. Not approved for use in veterinary medicine.
Isopropamide

Isamid, Marygin-M, Piaccamide, Priazimide, Sanulcin

Banned

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Definition: Anticholinergic

Information:

Isopropamide is a long acting anticholinergic. It is used in various gastrointestinal disorders. Not currently commercially available in EU or USA (discontinued).
Isoproterenol (Isoprenaline)

Isuprel

Banned

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Definition: Bronchodilator

Information:

It is closely related to epinephrine. Its primary use is for bradycardia, or heart block, or as an inhalor drug for asthma in humans. Not approved for use in veterinary medicine.
Isopyrin (Ramifenazone)

Delta-Tomanol, Tomanol

Banned

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Definition: Pain relief

Information:

Used as a painkiller and anti-inflammatory. Not commercially available in USA or EU. Not approved for use in veterinary medicine.
Isosorbide dinitrate

Isordil

Banned

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Definition: Vasodilator

Information:

This is a nitrate used in human medicine for dilating blood vessels in angina pectoris, and to treat congestive heart failure. Not approved for use in equine medicine. No legitimate therapeutic indication in the equine athlete.
Isothipendyl

Apaisyl, Actapront, Istamyl, Sedermyl

Banned

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Definition: Antihistamine

Information:

Isothipendyl is an antihistamine used as an anti-allergic drug in humans. May have a sedative effect. Not approved for veterinary use. May affect performance.

Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Isoxicam

Maxicam, Pacyl, Vectren

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

Not commerically available. Used as a painkiller. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Isoxsuprine Hydrochloride

Duvadilan, Fenam, Vadosilan, Vasosuprina Ilfi, Xuprin

Permitted

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Definition: Vasodilator

Information:

Isoxsuprine may be used in the treatment of vascular diseases of the lower limb.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

When Isoxsuprine hydrochloride is administered, the dose should be accurately calculated according to the actual weight of the horse. Every 24 hours, not more than 1.6 milligrams per pound of body weight should be administered (usually divided in two equal doses given 12 hours apart). For a 1,000-pound animal, the maximum daily dose is 1,600 milligrams, which equals 80 20-milligram tablets. No part of a dose should be administered during the four (4) hours prior to competing. Any medicated feed should be consumed and/or removed at least four (4) hours prior to competing. Isoxsuprine Hydrochloride should not be administered for more than five successive days.
Isradipine

Isradipine, Lomir

Banned

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Definition: Calcium channel blocker

Information:

Used in the treatment of hypertensive states in humans. No legitimate therapeutic indication in the equine athlete.
Kebuzone

Chebutan, Chepirol, Chetopir, Ketazon

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

Not commerically available. Used as a painkiller. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Ketamine

Ketajet, Vetalar, Ketanest, Ketaset, Ketalar

Conditionally Permitted

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Definition: Anaesthetic

Information:

Ketamine is a general anaesthetic resulting in sedation, immobility, analgesia and amnesia.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Ketazolam

Anseren, Ansietil, Sedatival, Sedotime, Solatran, Unakalm

Banned

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Definition: Anxiolytic

Information:

It is a benzodiazepine, and so has anxiolytic, anticonvulsant, sedative and muscle-relaxant properties. Not approved for use in veterinary medicine, but may have some medicinal indications for its use in equine medicine.
Ketoprofen

Alrheumat, Capisten, Fastum, Kenhancer, Ketoartril, Ketofen, Ketoprofene, Meprofen, Orudis, Profenid, Tafirol

Permitted

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Definition: Non-steroidal anti-inflammatory

Information:

Ketoprofen may be used to relieve pain, inflammation and control fever.

The detection time is estimated with 96 hours (4 days) after intra-venous administration.

A detection time is not the same as a withdrawal time. The detection time is the approximate period of time for which a substance (or its metabolite) remains in a horse's system such that it can be detected by the laboratory. The withdrawal time for a substance adds a safety margin, chosen with professional judgment and discretion to allow for individual differences between horses such as size, metabolism, degree of fitness, recent illness or disease etc.. You are advised to seek suitable advice from your treating veterinarian.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

The maximum permitted plasma concentration of Ketoprofen is 0.250 micrograms per milliliter.

When ketoprofen is administered, the dose should be accurately calculated according to the actual weight of the horse. Every 24 hours, not more than 1.0 milligrams per pound of body weight should be administered. For a 1000-pound horse, the maximum daily dose is 1.0 grams, which equals 10.0 cc of the injectable (100 milligrams per milliliter). Doses should be given 24 hours apart. No part of a dose should be administered during the 6 hours prior to competing. The maximum treatment time for ketoprofen is five successive days.

To avoid a stacking of NSAIDs violation under NRHA Medication Rules, only a single NSAID should be administered within 3 days (72 hours) of showing the horse.

Example: If your horse is on Banamine (Flunixin) prior to the show and you plan to switch to Phenylbutazone ("Bute") at the show, you should discontinue administering Banamine at least 72 hours prior to show time.
Ketorolac

Acular, Ketorolac, Toradol, Tora-Dol

Conditionally Permitted

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Definition: Non-steroidal anti-inflammatory

Information:

Ketorolac may be used to relieve pain, inflammation and control fever.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Ketotifen

Ketotifen oral, Zaditor, Alaway, Zyrtec Itchy Eye, Claritin Eye

Banned

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Definition: Antihistamine

Information:

In its ophthalmic form, this substance is used in humans to treat allergic conjunctivitis. In its oral form, it is used for asthma attacks. May have a sedative effect. Not approved for use in veterinary medicine. Potential to influence performance is high.

Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Krypton

Banned

Click to expand

Definition: Hypoxia Inducible Factor Activator

Information:

A noble gas that can be used in hypobaric chambers to produce hypoxia. It has no legitimate therapeutic indication in the equine athlete.
Labetalol

Albetol, Labetalol, Trandate

Banned

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Definition: Beta blocker

Information:

Used in the treatment of pregnancy induced hypertension or other hypertensive states in humans. No legitimate therapeutic indication in the equine athlete.
Lamotrigine

Lamictal, Lamotrigine

Banned

Click to expand

Definition: Anticonvulsant

Information:

Used to control seizures, like in epilepsy, and mood changes in bipolar disorder in humans. Not approved for veterinary use. Not commonly used in equine medicine. High possibility of affecting performance.
Lenperone

Elanone-V

Banned

Click to expand

Definition: Anxiolytic

Information:

An anxiolytic and anti-emetic agent. Used in research only. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Leptazole (Pentylenetetrazole)

Banned

Click to expand

Definition: Stimulant

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Letosteine

Broluidal, Viscotiol, Letofort

Banned

Click to expand

Definition: Mucolytic

Information:

A mucolytic used in many human medicines for cold symptoms. Not commercially available in USA or EU. Not approved for use in veterinary medicine.
Letrozole

Femar, Femara, Letrolan

Banned

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Definition: Aromatase inhibitor

Information:

Prevents the biosynthesis of oestrogen. Used in the treatment of breast cancer in women. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Levallorphan

Lorfan

Banned

Click to expand

Definition: Opiod antagonist

Information:

This substance is related to morphine, but counteracts the respiratory depression produced by morphine poisoning, without affecting its analgesic effects. The product is discontinued in several countries, including USA. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Levamisole

Decaris, Ergamisol, Ketrax

Conditionally Permitted

Click to expand

Definition: Anti-parasitic

Information:

Levamisole may be used in the treatment of parasitic diseases. Its metabolites include aminorex, a Controlled Medication.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Levobunolol

Akbeta, Betagan, Levobunolol Hydrochloride

Banned

Click to expand

Definition: Beta blocker

Information:

Used in the topical treatment of glaucoma in humans. It reduces intraocular pressure. Not approved for use in veterinary medicine, but may have some indications for horses with eye conditions.
Levocabastine

Livostin

Conditionally Permitted

Click to expand

Definition: Antihistamine

Information:

Levocabastine may be used in the control of allergies.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Levodopa

Atamet, Levodopa, Madopar, Parcopa, Prolopa, Sinemet, Stalevo

Banned

Click to expand

Definition: Di hydroxythenylalanine substitute

Information:

Used for treating symptoms of Parkinson's disease in humans. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. Possibility to affect performance is high.
Levomethadone

L-Polamidon, L-Polamidon C

Conditionally Permitted

Click to expand

Definition: Opioid

Information:

Levomethadone (levomethadone hydrochloride) may be used to relieve pain.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Levomethorphan

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Opiod analgesic

Information:

An opioid analgesic, not commercially available. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Levophacetoperane

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Boosts brain uptake of catecholamines

Information:

An antidepressant with anorexigenic properties. Not commercially available in USA or EU. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Levorphanol

Levorphanol Tartrate, Levo-Dromoran

Banned

Click to expand

Definition: Opiod analgesic

Information:

It has similar effects to morphine such as sedation, analgesia and respiratory depression, but is more potent, and has a longer half-life. Therefore it is used in treating chronic, severe pain. Not commercially available in all countries. Not approved for, and not commonly used in, veterinary medicine.
Levothyroxine

L Thyroxin, T4, Eltroxin, Euthyrox, Letterbox, Levaxin, L-thyroxine, Thyrax, Levoxyl, Synthroid, Thyrax Duotab, Thyrox, Eutirox, Tirosint, Thyrin, Thyrolar

Conditionally Permitted

Click to expand

Definition: Hormone

Information:

Levothyroxine may be used in the treatment of hypothyroidism.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
LGD-4033

Banned

Click to expand

Definition: Anabolic

Information:

An investigational selective androgen receptor modulator (SARM) used for treatment of muscle wasting with no legitimate therapeutic indication in the equine athlete
Lidocaine

Anestacon, Dalcaine Lidocaine, Laryng-O-Jet, Leostesin, Lidocaine, Neo-Novutox, Rapidocaine, Xylocaine, Xylotox

Conditionally Permitted

Click to expand

Definition: Local anaesthetic

Information:

Lidocaine is used for the temporary local relief of pain.

The detection time is estimated with 48 hours (2 days) after subcutaneous administration.

Please remember: A detection time is not the same as a withdrawal time. The detection time is the approximate period of time for which a substance (or its metabolite) remains in a horse's system such that it can be detected by the laboratory. The withdrawal time for a substance adds a safety margin, chosen with professional judgment and discretion to allow for individual differences between horses such as size, metabolism, degree of fitness, recent illness or disease etc. You are advised to seek suitable advice from your treating veterinarian.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Lidoflazine

Clinium, Corflazine, Klinium, Ordiflazine

Banned

Click to expand

Definition: Anti-arrhythmic

Information:

A long acting coronary vasodilator with some anti-arrhythmic action. Its use has not been described in horses, however it could potentially be effective.
Lisinopril

Prinivil, Zestril

Banned

Click to expand

Definition: Angiotensin-converting enzyme inhibitor

Information:

Lisinopril is an angiotensin converting enzyme (ACE) inhibitor drug, used in humans for the treatment of hypertension, congestive heart failure, heart attacks and also in preventing the renal and retinal complications of diabetes.

Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Lithium

Eskalith, Lithane, Lithium carbonate, Lithium Citrate

Banned

Click to expand

Definition: Mood stabiliser

Information:

Lithium salts are used as mood stabilisers in humans with bipolar disorders. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Lobeline

Desista, Habit-X, Lobatox, Lobidan, Nicoban, Refrane, Smokeless, Stopsmoke, Test Sixty, Unilobin

Banned

Click to expand

Definition: Respiratory stimulant

Information:

Lobeline is an alkaloid derived from the leaves of an Indian tobacco plant, and has been widely used in commercial smoking remedies. The respiratory stimulant, Lobeline, has been used in equine clinical practice to increase inspiratory and expiratory airflow rates at rest in order to facilitate investigation of both lower, and upper, airway function.
Lofentanil

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Opiod analgesic

Information:

It has similar effects to morphine such as sedation, analgesia and respiratory depression, but is more potent and has a a very long half-life. The strong effect, long duration and potential side effects make its medicinal use complicated, and it is mainly used for research purposes. Not commercially available in many countries, for example USA or EU. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. Possibility to affect performance is high.
Lofepramine

Gamanil, Tymelyt

Banned

Click to expand

Definition: Antidepressant

Information:

Lofepramine is a human antidepressant of the tricyclic class. No legitimate therapeutic indication in the equine athlete. Potential to influence performance is high.
Loperamide

Lopex, Imodium, Dimor, Pepto Diarrhea Control

Conditionally Permitted

Click to expand

Definition: Opioid agonist

Information:

Loperamide may be used in the treatment of digestive tract diseases such as diarrhoea.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Loprazolam

Dormonoct, Havlane, Somnovit

Banned

Click to expand

Definition: Anxiolytic

Information:

It is a benzodiazepine, and so has anxiolytic, anticonvulsant, sedative and muscle-relaxant properties. Not approved for use in veterinary medicine. Possibility to affect performance is high.
Loratadine

Claritine, Clarityn, Fristamin, Tidilor

Conditionally Permitted

Click to expand

Definition: Antihistamine

Information:

Loratadine may be used in the control of allergies.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Lorazepam

Ativan

Banned

Click to expand

Definition: Anxiolytic

Information:

It is a benzodiazepine, and so has anxiolytic, anticonvulsant, sedative and muscle-relaxant properties. Not approved for use in veterinary medicine. High possibility of affecting performance.
Lormetazepam

Noctamid, Ergocalm, Loramet, Dilamet, Sedaben

Banned

Click to expand

Definition: Anxiolytic

Information:

It is a benzodiazepine, and so has anxiolytic, anticonvulsant, sedative and muscle-relaxant properties. Not approved for use in veterinary medicine. Not approved in Canada or USA. High possibility of affecting performance.
Lornoxicam

Xefocam

Banned

Click to expand

Definition: Non-steroidal anti-inflammatory drug

Information:

Used as a painkiller and anti-inflammatory. Not approved for use in veterinary medicine.
Losartan

Cozaar, Hyzaar

Banned

Click to expand

Definition: Antihypertensive

Information:

A human medicine that is indicated for the treatment of hypertension. Not approved for use in veterinary medicine
Loxapine

Loxapac, Loxitane

Banned

Click to expand

Definition: Antipsychotic

Information:

Used primarily in the treatment of schizophrenia in humans. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Lucanthone

Nilodin

Banned

Click to expand

Definition: Radiation sensitizer

Information:

Lucanthone is used in combination with radiation or chemotherapy for the treatment of brain tumours in humans. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete.
Lumiracoxib

Prexige

Banned

Click to expand

Definition: Non-steroidal anti-inflammatory drug

Information:

Used as an anti-inflammatory and painkiller. Not commercially available in USA or EU. Not approved for use in veterinary medicine.
Mabuterol

Broncholin

Banned

Click to expand

Definition: Beta agonist

Information:

Beta agonists relax smooth muscle in airways, and are used to treat conditions like asthma. Not commercially available in the United States or EU. No legitimate therapeutic indication in the equine athlete.
Madol

Banned

Click to expand

Definition: Anabolic

Information:

A synthetic anabolic steroid, specifically produced for human performance enhancement. It has no legitimate therapeutic indication in the equine athlete
Magnesium sulphate (injection)

Magnesium sulphate, MgSO4

Conditionally Permitted

Click to expand

Definition: Inorganic compound

Information:

Magnesium sulphate injections may be used in the control of pain and have a calming effect.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Maprotiline

Deprilept, Ludiomil, Psymion

Banned

Click to expand

Definition: Antidepressant

Information:

A human antidepressant with sedative and anxiolytic properties. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Mazindol

Mazanor, Sanorex

Banned

Click to expand

Definition: Anorexic

Information:

Anorectic drug. Mazindol is a re-uptake inhibitor of noradrenaline, dopamine, and also serotonin. It supresses appetite, and has a medical indication in controlling obesity. Potential for abuse within all equestrian sporting disciplines. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
MDA (Methylenedioxyamphetamine)

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Stimulant

Information:

MDA (Methylenedioxyamphetamine) is a psychedelic stimulant of the amphetamine class. MDA has no accepted medical use. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
MDEA (Methylenedioxyethylamphetamine)

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Stimulant

Information:

MDEA (Methylenedioxyethylamphetamine) is a psychedelic stimulant of the amphetamine class. MDA has no accepted medical use. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
MDMA (Methylenedioxymethamphetamine)

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Stimulant

Information:

MDMA is considered unusual for its tendency to diminish feelings of fear and anxiety. These effects have led some to suggest it might have therapeutic benefits in certain individuals. MDMA is criminalised in most countries in the world, although some limited exceptions exist for scientific and medical research. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Mebanazine

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Mono-amine oxidase inhibitor

Information:

Used in the treatment of depression in humans. Not commercially available in USA or EU. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Mebeverine

Colofac, Duspatal

Banned

Click to expand

Definition: Antispasmodic

Information:

Indications for use are irritable bowel syndrome and gastrointestinal spasms in humans. Not approved for use in veterinary medicine, but may have potential for use as a treatment in horses with similar conditions.
Mebhydroline

Bexidal, Diazolin, Fabahistin

Banned

Click to expand

Definition: Antihistamine

Information:

Mebhydrolin (INN) or mebhydroline is an antihistamine, used for symptomatic relief of allergic symptoms in humans. May cause sedation. It is not available in the United States, but it is in various other countries. Not approved for veterinary use. May affect performance.

Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Mebutamate

Dormate

Banned

Click to expand

Definition: Sedative

Information:

Mebutamate is a sedative and anxiolytic drug with antihypertensive (blood pressure lowering) effects. Not available in most European countries, and discontinued in the USA. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Mecamylamine

Mecamylamine Hydrochloride

Banned

Click to expand

Definition: Nicotine antagonist

Information:

Used in the treatment of hypertension and used in human medicine to help stop smokers. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete.
Meclizine

Antivert, Bonine, Meclizine HCl

Banned

Click to expand

Definition: Antihistamine

Information:

An antihistamine which is also used to control vertigo and motion sickness in humans. May cause mild sedation and drowsiness. Not approved for use in equines.

Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Meclofenamic Acid

Lenidolor, Meclodol, Meclofenamate, Meclomen, Movens

Conditionally Permitted

Click to expand

Definition: Non-steroidal anti-inflammatory

Information:

Meclofenamic acid may be used to relieve pain and inflammation.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Meclofenoxate

Lucidril

Banned

Click to expand

Definition: Stimulant

Information:

Meclofenoxate is a drug used to treat the symptoms of senile dementia and Alzheimer's disease. Small amounts can be found naturally in some foods, especially fish, and is also a natural metabolite of choline in the body system. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete.
Meconine

Trade names are not currently listed on this site.

Banned

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Definition: Opiod

Information:

Primary metabolite of noscapine.

Meconine is a Specified Substance. Specified Substances should not in any way be considered less important or less dangerous than other Prohibited Substances. Rather, they are simply substances which are more likely to have been ingested by Horses for a purpose other than the enhancement of sport performance, for example, through a contaminated food substance.
Medazepam

Nobrium, Rudotel, Raporan, Ansilan

Banned

Click to expand

Definition: Anxiolytic

Information:

It is a benzodiazepine, and so has anxiolytic, anticonvulsant, sedative and muscle-relaxant properties. Not approved for use in veterinary medicine. Not approved in Canada or USA. High possibility of affecting performance.
Medetomidine

Domitor

Conditionally Permitted

Click to expand

Definition: Sedative

Information:

Medetomidine may be used for sedation and anaesthetic premedication in horses.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Medroxyprogesterone (Medroxyprogesterone Acetate)

Depo-Provera, Dilena, Divina, Enaf, Farlutes, Premelle, Provera

Banned

Click to expand

Definition: Progestin

Information:

Used the in treatment of menstrual disorders (irregular periods, also menopause). Medroxyprogesterone is often used synonymously to 'Medroxyprogesterone Acetate'. The latter is usually the substance that is usually administered in practice. Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Medroxyprogesterone Acetate (Medroxyprogesterone)

Depo-Provera, Dilena, Divina, Enaf, Farlutes, Premelle, Provera

Banned

Click to expand

Definition: Progestin

Information:

Used the in treatment of menstrual disorders (irregular periods, also menopause). Medroxyprogesterone is often used synonymously to 'Medroxyprogesterone Acetate'. The latter is usually the substance that is usually administered in practice. Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Medrylamine

Postafen

Banned

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Definition: Antihistamine

Information:

It is used for the treatment of allergic skin disorders.

Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Medrysone

HMS

Banned

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Definition: Corticosteroid

Information:

An ophthalmic solution that is not commerically available at the moment. It is indicated for the treatment of allergic conjunctivitis, vernal conjunctivitis, episcleritis, and epinephrine sensitivity in humans. Not approved for use in veterinary medicine.
Mefenamic acid

Ponstel, Ponstan, Ponstal, Parkemed, Mafepain, Mephadolor, Meftal, Dyfenamic, Potarlon, Dolfenal

Banned

Click to expand

Definition: Non-steroidal anti-inflammatory drug

Information:

Used as painkiller and anti-inflammatory. Not approved for use in veterinary medicine, but it is sometimes prescribed for the oral administration of anti-inflammatories in equine medicine.
Mefenorex

Rondimen, Pondinil

Banned

Click to expand

Definition: Stimulant

Information:

Mefenorex is an amphetamine derivative stimulant drug, which was used as an appetite suppressant for treating obesity. Mefenorex produces amphetamine as a metabolite, and has been withdrawn in many countries. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Mefexamide

Méféxadyne, Perneuron, Timodyne

Banned

Click to expand

Definition: Stimulant

Information:

Mefexamide is a stimulant antidepressant, which is not commercially available for medicinal use. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Mefruside

Baycaron

Banned

Click to expand

Definition: Diuretic

Information:

Not commercially available in USA or EU. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Meldonium

Mildronate

Banned

Click to expand

Definition: Anti-ischaemic

Information:

Meldonium is a substances used to treat ischaemia in coronary artery disease. It can be used to enhance performance and improve recovery time after exercise by increasing blood flow throughout the body. The substance also has anti-convulsant effects.
Meloxicam

CO Meloxicam, Dom-Meloxicam, Gen-Meloxicam, Meloxicam, Metacam, Mobic, Mobicox, Movalis, Movatec, Novo-Meloxicam, Parocin, Petcam, PHL-Meloxicam, PMS-Meloxicam, Tenaron

Conditionally Permitted

Click to expand

Definition: Non-steroidal anti-inflammatory

Information:

Meloxicam may be used to relieve pain, inflammation and control fever.

The detection time is estimated with 72 hours (3 days) after oral administration.

A detection time is not the same as a withdrawal time. The detection time is the approximate period of time for which a substance (or its metabolite) remains in a horse's system such that it can be detected by the laboratory. The withdrawal time for a substance adds a safety margin, chosen with professional judgment and discretion to allow for individual differences between horses such as size, metabolism, degree of fitness, recent illness or disease etc.. You are advised to seek suitable advice from your treating veterinarian.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Melperone

Buronil, Burnil, Eunerpan

Banned

Click to expand

Definition: Antipsychotic

Information:

Used primarily in the treatment of schizophrenia in humans. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Memantine

Axura, Ebixa, Namenda

Banned

Click to expand

Definition: N-methyl D-asparate receptor antagonist

Information:

Used in the treatment of Alzheimer type dementia in humans. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete.
Meparfynol

Allotropal, Anti-Stress, Dormison, Oblivon

Banned

Click to expand

Definition: Anxiolytic

Information:

A hypnotic sedative. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Mepazine

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Antipsychotic

Information:

Used primarily in the treatment of schizophrenia in humans. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Mepenzolate

Cantil

Banned

Click to expand

Definition: Muscle relaxant

Information:

Mepenzolate relieves cramping of the gastrointestinal tract, and acid secretion of the stomach. It is used in the treatment of peptic ulcers in humans. Not approved for use in veterinary medicine. May have potential for treating horses with similar conditions, but has not been used in equine medicine so far.
Meperidine (Pethidine)

Mepergan, Demerol, Meperidine Hydrochloride

Banned

Click to expand

Definition: Opiod analgesic

Information:

Fast acting, opioid, analgesic drug. Not approved for use in veterinary medicine.
Mephenesin

Decontractyl, Myanesin, Relaxar, Rhex

Banned

Click to expand

Definition: Muscle relaxant

Information:

Used as a muscle relaxant in anaesthesia in humans, and also for treating anxiety tension states. Not commercially available in the USA or EU. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Mephentermine

Wyamine sulfate

Banned

Click to expand

Definition: Stimulant

Information:

Mephentermine is a cardiac stimulant with psychoactive properties. Not commercially available now for medicinal use anymore in most countries. There is some recognised misuse of this substance. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Mephenytoin

Mesantoin

Banned

Click to expand

Definition: Anticonvulsant

Information:

Mephenytoin is no longer available in the USA or the EU. It is a drug used to control seizures. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Mephobarbital

Mebaral

Banned

Click to expand

Definition: Sedative

Information:

Mephobarbital is used as a sedative, anxiolytic and anticonvulsant in humans. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. Possibility to affect performance is high.
Mepindolol

Betagon, Corindolan, Mepicor

Banned

Click to expand

Definition: Beta blocker

Information:

Used in glaucoma treatment. Not commercially available in the USA or EU. Not approved for use in veterinary medicine.
Mepivacaine

Carbocain, Carbocaine, Intra-Epicaine, Isocaine, Meaverin, Mepicaton, Mepivacaine, Mepivastesin, Polocaine, Scandicain, Scandicaine, Scandinibsa

Conditionally Permitted

Click to expand

Definition: Local anaesthetic

Information:

Mepivacaine is used for the temporary local relief of pain.

The detection time is estimated with 48 hours (2 days) after subcutaneous administration.

Please remember: A detection time is not the same as a withdrawal time. The detection time is the approximate period of time for which a substance (or its metabolite) remains in a horse's system such that it can be detected by the laboratory. The withdrawal time for a substance adds a safety margin, chosen with professional judgment and discretion to allow for individual differences between horses such as size, metabolism, degree of fitness, recent illness or disease etc. You are advised to seek suitable advice from your treating veterinarian.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Meprednisone

Betapar, Cortipyren B, Deltisona B, Latisona B, Prednisonal

Banned

Click to expand

Definition: Corticosteroid

Information:

It is a methylated derivative of prednisone. Not commercially available. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Meprobamate (Meprobromate)

Meprobamate

Banned

Click to expand

Definition: Anxiolytic

Information:

Used as a mild sedative and analgesic. Also in combination with other substances as a muscle relaxant. Possibility to affect performance is high.
Meprobromate (Meprobamate)

Meprobamate

Banned

Click to expand

Definition: Anxiolytic

Information:

Used as a mild sedative and analgesic. Also in combination with other substances as a muscle relaxant. Possibility to affect performance is high.
Meprylcaine

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Local anaesthetic

Information:

Topical local anaesthetic. Not commercially available, for example, in USA or EU. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Meptazinol

Meptid

Banned

Click to expand

Definition: Opioid analgesic

Information:

A analgesic that was mainly used in human obstetrics (childbirth related procedures), but is now discontinued in many countries. Meptazinol exhibits not only a short onset of action, but also a shorter duration of action relative to other opioids. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Mepyramine (Pyrilamine)

Albatussin, Anthisan

Conditionally Permitted

Click to expand

Definition: Antihistamine

Information:

Mepyramine (Pyrilamine) may be used in the control of allergies.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Meralluride

Mercuhydrin

Banned

Click to expand

Definition: Diuretic

Information:

A mercurial diuretic that is not commercially available in USA or EU. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Merbaphen

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Diuretic

Information:

A diuretic that is no longer commercially available in USA or EU. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Mercaptomerin

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Diuretic

Information:

Not commercially available in USA or EU. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Mersalyl

Diursal, Igrosin, Mercurital, Mercusal, Salyrgan, Uragan

Banned

Click to expand

Definition: Diuretic

Information:

Not commercially available in USA or EU. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Mesalamine (Mesalazine)

Asacol, Delzicol, Lialda, Mezavant, Octasa, Pentasa, Salofalk, Zintasa

Conditionally Permitted

Click to expand

Definition: Non-steroidal anti-inflammatory

Information:

Mesalamine (Mesalazine) may be used to treat diseases of the digestive tract.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Mesalazine (Mesalamine)

Asacol, Delzicol, Lialda, Mezavant, Octasa, Pentasa, Salofalk, Zintasa

Conditionally Permitted

Click to expand

Definition: Non-steroidal anti-inflammatory

Information:

Mesalamine (Mesalazine) may be used to treat diseases of the digestive tract.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Mesocarb

Sydnocarb

Banned

Click to expand

Definition: Stimulant

Information:

Mesocarb is a stimulant drug which acts as a dopamine re-uptake inhibitor. Mesocarb is used for a variety of applications in humans; these include counteracting the sedative effects of benzodiazepine drugs, increasing workload capacity and cardiovascular function, treatment of Attention Deficit Hyperactive Disorder (ADHD) and hyperactivity in children,and as a drug to enhance resistance to extremely cold temperatures. It is also listed as having antidepressant and anticonvulsant properties. Mesocarb is sold in Russia as 5 milligram tablets. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Mesoridazine

Serentil

Banned

Click to expand

Definition: Neuroleptic

Information:

Used in the treatment of schizophrenia. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Mestanolone

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Anabolic

Information:

An orally bioavailable synthetic steroid hormone. It has androgenic and anabolic activity, with short term effects and excretion time. Mestanolone is commercially available in Japan. It has been abused to improve physical performance for its anabolic effects in both human sports and horseracing. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Mesterolone

Proviron

Banned

Click to expand

Definition: Anabolic

Information:

An orally bioavailable synthetic anabolic and androgenic steroid (AAB) derived from dihydrotestosterone. Used therapeutically as an antidepressant in humans. It has reportedly been abused in human sports, and is a potential doping agent in equine sports. Mesterolone has been banned by the Food and Drug Administration (FDA). No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Metaclazepam

Talis

Banned

Click to expand

Definition: Anxiolytic

Information:

An anxiolytic with mild sedative effect. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Metamizole (Dipyrone)

Adolkin, Alginodia, Dolemicin, Lasain, Metilon, Minalgin, Neo-Melubrine, Nolotil, Novalgin, Novaminsulfon, Novemina, Optalgin, Vetalgin

Conditionally Permitted

Click to expand

Definition: Non-steroidal anti-inflammatory

Information:

Metamizole (Dipyrone) may be used to relieve pain and spasms.

The detection time is estimated with 72 hours (3 days) after intravenous administration.

A detection time is not the same as a withdrawal time. The detection time is the approximate period of time for which a substance (or its metabolite) remains in a horse's system such that it can be detected by the laboratory. The withdrawal time for a substance adds a safety margin, chosen with professional judgment and discretion to allow for individual differences between horses such as size, metabolism, degree of fitness, recent illness or disease etc.. You are advised to seek suitable advice from your treating veterinarian.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

To avoid a stacking of NSAIDs violation under NRHA Medication Rules, only a single NSAID should be administered within 3 days (72 hours) of showing the horse.

Example: If your horse is on Banamine (Flunixin) prior to the show and you plan to switch to Phenylbutazone ("Bute") at the show, you should discontinue administering Banamine at least 72 hours prior to show time.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Metaproterenol

Alotec, Alupent, Metaprel, Metaproterenol

Banned

Click to expand

Definition: Bronchodilator

Information:

Metaproterenol is a bronchodilator. It works by relaxing muscles in the airways to improve breathing. Not approved for use in veterinary medicine.
Metaraminol

Aramine, Metaraminol Bitatrate

Banned

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Definition: Stimulant

Information:

Metaraminol is stimulates the alpha-receptors, and has potential for misuse in the equine athlete. It is used in the prevention and treatment of low blood pressure occurring with spinal anaesthesia hemorrhage, reactions to medications, surgical complications, and shock associated with brain damage baused by trauma or tumour. The sale of this product is discontinued in some countries.
Metaxalone

Skelaxin

Banned

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Definition: Muscle relaxant

Information:

A muscle relaxant used to relax muscles and relieve pain caused by musculoskeletal conditions. Not approved for use in veterinary medicine.
Metazocine

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Opiod analgesic

Information:

An opioid analgesic, not commercially available for medicinal use because of its hallucinogenic properties. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Metformin

Glucophage XR, Carbophage SR, Riomet, Fortamet, Glumetza, Obimet, Gluformin, Dianben, Diabex, Diaformin, Siofor and Metfogamma.

Conditionally Permitted

Click to expand

Definition: Anti-hyperglycaemic

Information:

Metformin may be used in the treatment of Equine Metabolic Syndrome.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Methacholine

Mecholyl, Methacholine, Provocholine, Provokit

Banned

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Definition: Hypotensive

Information:

Methacholine is used to diagnose bronchial hyperreactivity, which is the hallmark of asthma and also occurs in chronic obstructive pulmonary disease. Not validated, but may have potential use in equine medicine.
Methadone

Dolmed, L-Polamivet, Methadose, Westadone

Conditionally Permitted

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Definition: Opioid

Information:

Methadone may be used to relieve pain.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Methallenestril

Vallestril

Banned

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Definition: Oestrogen

Information:

An oestrogen hormone twith anabolic properties. Previously used to treat menopausal women, but no longer commercially available, for example, in USA or EU anymore. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Methamphetamine

Desoxyn

Banned

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Definition: Stimulant

Information:

Methamphetamine is a sympathomimetic amine with CNS stimulant activity. It also causes an elevation of blood pressure and dilation of airways. It is widely abused as an recreational drug, and the only medical indication is in the treatment of severe obesity in humans non-responsive to other treatment options. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Methandienone

Anabol, Dianabol, Melic

Banned

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Definition: Anabolic

Information:

An orally bioavailable synthetic anabolic and androgenic steroid (AAB). It has no legitimate medical use, it is abused by human body builders, and is banned by the Food and Drug Administration (FDA). No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Methandriol

Sinesex, Stenediol, Troformone

Banned

Click to expand

Definition: Anabolic

Information:

It is a synthetic adrostenediol derivative, ana an anabolic steroid with some androgenic properties. It is abused by human body builders and is banned by the Food and Drug Administration (FDA). No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Methandrostenolone

Dianabol, Danabol, Reforvit-b

Banned

Click to expand

Definition: Anabolic

Information:

An orally bioavailable synthetic anabolic and androgenic steroid (AAB), with no legitimate medical use. It is abused by human body builders, and is banned by the Food and Drug Administration (FDA) under the Controlled Substances Act. Production has ceased in Western Europe and the USA, although it is still readily available in certain South American, Asian and Eastern European countries. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Methantheline

Asabaine, Avagal, Banthin, Dixamone, Doladene, Frenogastrico,Gastrin-1 Human, Gastrin I, Gastrosedan, Metantyl, Metaxan, Methanide, Resobantin, Ulcine, Ulcudexter, Vagamin, Xanteline

Banned

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Definition: Antimuscarinic

Information:

Suggested use in for treating peptic ulcers in humans, in conjunction with other treatments. May also have potential for use in equine peptic ulcers as well, but has not been reported or studied yet.
Methapyrilene

Paradormalene, Pyrathyn, Pyrinistab, Pyrinistol, Rest-On, Restryl, Semikon, Tenalin, Thionylan

Banned

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Definition: Antihistamine

Information:

No longer in medicinal use in most countries due to its liver-toxicity. It has a relatively strong sedative effect, so its primary use was as a medication for insomnia. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.

Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Methaqualone

Mandrax

Banned

Click to expand

Definition: Sedative

Information:

A sedative and muscle relaxant that was used as a sleeping pill in the 1970s. It is also widely misused. Both medical and non-medical use led to many fatal overdoses,and the drug was withdrawn in the 1980s. However it is still manufactured in India, and is a street drug in some countries of Africa and other areas of the world. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Metharbital

Trade names are not currently listed on this site.

Banned

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Definition: Sedative

Information:

It is a barbiturate anticonvulsant, previously used in the treatment of epilepsy, but no longer sold for medicinal use. It has similar properties to phenobarbital. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Methasterone

Methasteron, Superdrol, Methyldrostanolone

Banned

Click to expand

Definition: Anabolic

Information:

An orally bioavailable synthetic anabolic and androgenic steroid (AAB). Methasterone is not controlled by the Food and Drug Administration, and is commercially available in many countries. Methasterone has no legitimate medical use. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Methazolamide

Methazolamide

Banned

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Definition: Diuretic

Information:

Methazolamide tablets are used to decrease eye pressure in people with glaucoma. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Methcathinone

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Psychoactive

Information:

Methcathinone is a psychoactive substance that is used as a recreational drug. Not legal under any circumstances, for example in the USA due to its classification as a Schedule I substance. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Methdilazine

Bristaline, Dilosyn, Disyncram, Tacaryl, Tacazyl, Tacryl

Banned

Click to expand

Definition: Antihistamine

Information:

An antihistamine which also has antibacterial action. Although potentially useful in the future, currently there is no legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.

Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Methenolone

Primobolan

Banned

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Definition: Anabolic

Information:

Long acting anabolic steroid with some androgenic properties. It is frequently abused by human athletes, and there is potential for abuse in racehorses. Methenolone has been banned by the U.S Food and Drug Administration (FDA). No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Methimazole

Tapazole, Felimazole

Banned

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Definition: Antihyperthyroidsim

Information:

Methimazole is a drug used to treat hyperthyroidism in humans and cats. May cause drowsiness. No legitimate therapeutic indication in the equine athlete. May affect performance.
Methixene

Tremaril

Banned

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Definition: Antispasmodic

Information:

Methixene is used as an anticholinergic, antispasmodic, or antiparkinsonism drug. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete.
Methocarbamol

Delaxin, Lumirelax, Methocarbamol, Miowas, Robaxin, Traumacut, Tresortil

Permitted

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Definition: Muscle relaxant

Information:

Methocarbamol may be used in the treatment of muscle spasms and pain.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Maximum permitted plasma concentration of Methocarbamol is 4.0 micrograms per milliliter.

When methocarbamol is administered, the dose should be accurately calculated according to the actual weight of the horse. Every 24 hours, not more than 5.0 mg per pound of body weight should be administered. For a 1000-pound horse, the maximum dose every 24 hours is 5.0 grams, which equals ten 500 milligram tablets or 50 cc of the injectable (100 milligrams per milliliter). No part of a dose should be administered during the 12 hours prior to competing. Any medicated feed must be consumed and/ or removed at least 12 hours prior to competing. Methocarbamol should not be administered for more than five successive days.
Methohexital

Brevital Sodium

Banned

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Definition: Sedative

Information:

Methohexital sodium is a rapid, ultrasfast acting barbiturate anaesthetic that is used in the induction of anaesthesia in humans. Not commonly used in veterinary medicine, but could possibly be similarly used for induction of anaesthesia in animals. Not approved for use in veterinary medicine. High possibility of affecting performance.
Methotrexate

Trexall, Rheumatrex

Banned

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Definition: Immunomodulator

Information:

Used in cancer treatments, auto-immune diseases and early pregnancy determination drugs. No legitimate therapeutic indication in the equine athlete.
Methotrimeprazine

Nozinan

Banned

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Definition: Antipsychotic

Information:

Used in humans to treat psychotic disturbances, aniexty and tension but also as a sedative. It also has an analgesic effect. Not approved for veterinary use. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Methoxamine

Idasal, Vasoxine, Vasoxyl, Vasylox

Banned

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Definition: Vasoconstriction

Information:

Methoxamine is an α1-adrenergic receptor agonist, similar in structure to, for example, phenylephrine. It induces vasoconstriction of skin blood vessels, thereby increasing arterial blood pressure. The effect of methoxamine in raising blood pressure in horses during anaesthesia has been studied, and no beneficial effects were found. Therefore, very few, if any, therapeutic indications exist for use in equine medicine. Not approved for use in veterinary medicine. Moderate possibility of affecting performance.
Methoxyphenamine

Asmi, Euspirol, Orthoxine, Ortodrinex, Proasma

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

A sympathomimetic bronchodilator. Not approved for veterinary medicine. Not commercially available. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Methoxypromazine

Trade names are not currently listed on this site.

Conditionally Permitted

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Definition: Sedative

Information:

Methoyxpromazine may be used for sedation.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Methscopolamine (Methyl Scopolamine)

Pamine

Banned

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Definition: Muscarinic antagonist

Information:

Methscopolamine (Methyl Scopolamine) is used to reduce stomach acid secretion to help control peptic ulcers. Not approved for use in veterinary medicine.
Methsuximide

Celontin

Banned

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Definition: Anticonvulsant

Information:

Methsuximide is an anticonvulsant. It works by reducing abnormal nerve transmission in the brain, which helps decrease seizures. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. Non-steroidal anti-inflammatory drug
Methyclothiazide

Methyclothiazide, Enduron

Banned

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Definition: Diuretic

Information:

Methyclothiazide is used as a diuretic and antihypertensive in human patients. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Methyl Scopolamine (Methscopolamine)

Pamine

Banned

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Definition: Muscarinic antagonist

Information:

Methyl Scopolamine (Methscopolamine) is used to reduce stomach acid secretion to help control peptic ulcers. Not approved for use in veterinary medicine.
Methylaminorex

Trade names are not currently listed on this site.

Banned

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Definition: Stimulant

Information:

4-Methylaminorex has effects comparable to methamphetamine, but with a much longer duration. It is abused as a recreational drug, and is classified as an illegal drug in many countries. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Methylatropine

Mintussin, Mydriasin, Tropin

Banned

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Definition: Anticholinergic

Information:

An atropine derivative that has an effect on blood pressure, gastrointestinal spasms and airways. Not in medical use, and not available commercially. Currently no legitimate therapeutic indication in the equine athlete.
Methylchlorthiazide (Methylclothiazide)

Banned

Click to expand

Definition: Diuretic

Information:

Not commercially available in USA or EU. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Methylclothiazide (Methylchlorthiazide)

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Diuretic

Information:

Not commercially available in USA or EU. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Methyldienolone

Methyldien

Banned

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Definition: Anabolic

Information:

A very potent anabolic synthetic steroid, with some androgenic activity. No medical use, and little abuse to date, although there is a lot of potential for this both human, and equestrian sports.
Methyldihydromorphinone

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Opiod analgesic

Information:

An opioid analgesic, not commercially available for medicinal use. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Methyldopa

Aldomet, Aldoril, Dopamet

Banned

Click to expand

Definition: Antihypertensive

Information:

A human medicine that is indicated for the treatment of hypertension. Not approved for use in veterinary medicine.
Methylenedioxyamphetamine (MDA)

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Stimulant

Information:

Methylenedioxyamphetamine (MDA) is a psychedelic stimulant of the amphetamine class. MDA has no accepted medical use. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Methylenedioxyethylamphetamine (MDEA)

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Stimulant

Information:

Methylenedioxyethylamphetamine (MDEA) is a psychedelic stimulant of the amphetamine class. MDA has no accepted medical use. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Methylenedioxymethamphetamine (MDMA)

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Stimulant

Information:

Methylenedioxymethamphetamine (MDMA) is considered unusual for its tendency to diminish feelings of fear and anxiety. These effects have led some to suggest it might have therapeutic benefits in certain individuals. MDMA is criminalised in most countries in the world, although some limited exceptions exist for scientific and medical research. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Methylephedrine

Codaewon, Coughmin, Ilvico Syrup, Ilvico Liquid, Methorcon, Tussoretardin

Banned

Click to expand

Definition: Stimulant

Information:

A central nervous system stimulant that is sometimes used in diet pills or cough supressants. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Methylergonovine

Methergine

Banned

Click to expand

Definition: Vasoconstriction

Information:

Methylergonovine is a uterine stimulant. It works by increasing uterine contractions, and is used in humans for reducing blood loss after the delivery of a baby. Not approved for use in equine medicine. No legitimate therapeutic indication in the equine athlete.
Methylhexanamine

Iron Tiger, Forthane, Geranamine, DMAA, Floradrene

Banned

Click to expand

Definition: Sympathomimetic

Information:

Methylhexanamine is a stimulant that can affect performance and has no legitimate use in sports horses
Methylhexaneamine

Geranamine

Banned

Click to expand

Definition: Stimulant

Information:

Previously used as a nasal decongestant, methylhexaneamine is currently marketed as a dietary supplement in combination with other substances, for example caffeine. No legitimate therapeutic indication in the equine athlete. Moderate possibility of affecting performance.
Methylmethcathinone

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Psychoactive

Information:

Methylmethcathinone is a psychoactive substance used as a recreational drug. Classified as an illegal drug in some countries, and as a medicine in others, it is not commercially available for medicinal use in most countries. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Methylnortestosterone

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Anabolic

Information:

A potent synthetic androgen. There is little evidence of the usage of this steroid in any species to date, however researchers are looking into its potential use for spermatogenic suppression in men.
Methylphenidate

Ritalin

Banned

Click to expand

Definition: Stimulant

Information:

This is a psychostimulant that works by increasing the activity of the central nervous system. Its effects include increasing or maintaining alertness, combating fatigue, and improving attention. It is used in humans, for example, in the treatment of ADHD (Attention Deficit Hyperactivity Disorder) and narcolepsia. Methylphenidate makes horses hyperresponsive to auditory and visual stimuli. Not approved for use in equine medicine. May have potential for treating equine narcolepsy but has not been studied or reportedly used, for that indication.
Methylprednisolone (Methylprednisolone Acetate)

Besonia, Depomedrol, Esametone, Lemod, Medesone, Medixon, Medlone, Medrol Dosepak, Medrone, Mesopren, Metastab, Methylprednisolone, Metrisone, Metrocort, Metysolon, Promacortine, Reactenol, Summicort

Conditionally Permitted

Click to expand

Definition: Corticosteroid

Information:

Methylprednisolone is used in the treatment of arthritis and various respiratory diseases, as well as in the management of auto-immune diseases.

The detection time is estimated with 672 hours (28 days) after intra-articular administration.

Please remember: A detection time is not the same as a withdrawal time. The detection time is the approximate period of time for which a substance (or its metabolite) remains in a horse's system such that it can be detected by the laboratory. The withdrawal time for a substance adds a safety margin, chosen with professional judgment and discretion to allow for individual differences between horses such as size, metabolism, degree of fitness, recent illness or disease etc. You are advised to seek suitable advice from your treating veterinarian.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Methylprednisolone Acetate (Methylprednisolone)

Besonia, Depomedrol, Esametone, Lemod, Medesone, Medixon, Medlone, Medrol Dosepak, Medrone, Mesopren, Metastab, Methylprednisolone, Metrisone, Metrocort, Metysolon, Promacortine, Reactenol, Summicort

Conditionally Permitted

Click to expand

Definition: Corticosteroid

Information:

Methylprednisolone acetate is used in the treatment of arthritis and various respiratory diseases, as well as in the management of auto-immune diseases.

The detection time is estimated with 672 hours (28 days) after intra-articular administration.

Please remember: A detection time is not the same as a withdrawal time. The detection time is the approximate period of time for which a substance (or its metabolite) remains in a horse's system such that it can be detected by the laboratory. The withdrawal time for a substance adds a safety margin, chosen with professional judgment and discretion to allow for individual differences between horses such as size, metabolism, degree of fitness, recent illness or disease etc. You are advised to seek suitable advice from your treating veterinarian.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Methylprylon (Methyprylon)

Dimerin, Methprylon, Noctan, Nodular

Banned

Click to expand

Definition: Sedative

Information:

Methylprylon (Methyprylon) is a sedative used for treating insomnia, but is now rarely used as it has been withdrawn from the markets in many countries and been replaced by newer drugs with fewer side effects, such as benzodiazepines. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Methylpseudoephedrine

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Stimulant

Information:

A psychostimulant which also relieves nasal and mucous swelling, and is mainly used as a relief for common cold symptoms. It is a prohibited substance in sports. Not commonly used in equine medicine. Not approved for use in veterinary medicine. High possibility of affecting performance.
Methylsalicylic acid

Tubasal, Nemasol Sodium

Conditionally Permitted

Click to expand

Definition: Non-steroidal anti-inflammatory

Information:

Methylsalicylic acid may be used to relieve pain. It metabolises into salicylic acid, a Controlled Medication.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Methyltestosterone

Android, Testred, Virilon

Banned

Click to expand

Definition: Anabolic

Information:

An oral synthetic androgenic steroid, with some anabolic properties. It is produced and sold in many countries, including the USA. No current medical indication in horses, however it is used to treat breast cancer in women, testosterone deficiency in men, and abused for its androgenic potential in bodybuilders. Methyltestosterone has been banned by the International Olympic Committee and the Food and Drug Administration (FDA).
Methyltrienolone

Metribolone

Banned

Click to expand

Definition: Anabolic

Information:

A potent, synthetic, orally administered androgen, with no legitimate medical use. Potential for abuse, due to its anabolic properties.
Methyprylon (Methylprylon)

Dimerin, Methprylon, Noctan, Nodular

Banned

Click to expand

Definition: Sedative

Information:

Methyprylon (Methylprylon) is a sedative used for treating insomnia, but is now rarely used as it has been withdrawn from the markets in many countries and been replaced by newer drugs with fewer side effects, such as benzodiazepines. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Methysergide

Sansert, Deseril

Banned

Click to expand

Definition: 5-hydroxytryptamine receptor antagonist

Information:

Methysergide is a prescription drug used for prophylaxis of migraine headaches in humans. Methysergide also produces psychedelic and hallucinogenic effects. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Meticrane

Arresten, Fontiliz

Banned

Click to expand

Definition: Diuretic

Information:

Not commercially available in the USA or EU. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Metipranolol

Optipranolol, Metipranolol

Banned

Click to expand

Definition: Beta blocker

Information:

Used in the topical treatment of glaucoma in humans. It reduces intraocular pressure. Not approved for use in veterinary medicine.
Metoclopramide

Apo-Metoclop, Clopra, Clopromate, Elieten, Emperal, Enterosil, Gastrosil, Maxolon, Metoclopramide, Metopram, Paspertin, Primperan, Reglan, Viscal

Conditionally Permitted

Click to expand

Definition: Dopamine antagonist

Information:

Metoclopramide may be used in the treatment of ileus.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Metocurine

Metocurine Iodide, Metubine, Mutubine Iodide

Banned

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Definition: Muscle relaxant

Information:

Metocurine iodide is given by injection for muscle relaxation as a pre-anaesthetic, or during surgery. It is given by injection only. Its use in horses is prohibited by equine control bodies.
Metolazone

Mykrox, Zaroxolyn

Banned

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Definition: Diuretic

Information:

Metolazone is generally prescribed with other antihypertensive drugs, as rapid acting highly available or slower onset less bioavailable, medicine for hypertension. Dose rates for oedema of congestive heart failure, or renal or liver failure are not separately established. Not authorised for animals; use in horses prohibited by equine control bodies.
Metomidate

Aquacalm, Hypnodil, Methoxymol

Banned

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Definition: Hypnotic

Information:

Metomidate is used by registered veterinary practitioners for the sedation of pigs and birds in particular, especially raptor species. It is usually combined with Azaparone. Use in horses prohibited by equine control bodies.
Metoprolol

Beloc, Beprolo, Betaloc, Lopresor, Lopressor, Metoprolol, Novo-Metoprol, Selokeen, Seloken

Banned

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Definition: Beta blocker

Information:

Metoprolol tartrate and succinate salts are prescribed for stable symptomatic heart failure due to ischaemia, hypertension or cardiomyopathy, for long-term treatment of angina pectoris, and treatment and prevention of arrhythmia. Not licensed for animals; use in horses prohibited by equine control bodies.
Metrenperone

Trade names are not currently listed on this site.

Banned

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Definition: Antipyretic

Information:

Metrenperone helps heal skin and muscle ulcers, refractory lesions of diabetes, leprosy, and ischaemia. Used off-licence in veterinary medicine for pyrexic inflammatory conditions in cattle, and navicular disease in horses. Potentially modulates repair of acutely injured collagenous (tendon) tissue; high possibility of affecting performance.
Metyrapone

Mepyrapone, Metapirone, Metapyron, Metapyrone, Methopirapone, Methopyrapone, Methopyrinine, Methopyrone, Metopiron, Metopirone, Metopyrone, Metroprione

Banned

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Definition: Hydrocortisone synthesis inhibitor

Information:

Metyrapone is a diagnostic aid for differential diagnosis of Adrenocorticotropic hormone (ACTH) dependent Cushing's syndrome in medical and veterinary medicine and helps management of the disorder. In human patients with cirrhosis, nephrosis, and congestive heart failure, it is given with glucocorticosteroids for resistant oedema, caused by increased aldosterone secretion.
Mexazolam

Melex, Sedoxil

Banned

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Definition: Anxiolytic

Information:

Due to relatively rapid onset and development of tolerance, Mexazolam is used as a short term anxiolytic. Some drowsiness may occur. Undergoes hepatic metabolism and renal excretion. Not approved for animals. Use in horses prohibited by equine control bodies.
Mexiletine

Alti-Mexiletine, Katen, Mexetil, Mexilen, Mexiletine, Mexitil, Mexitilen, Myovek, Novo-Mexiletine, Ritalmex, Tumetil

Banned

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Definition: Anti-arrhythmic

Information:

Mexiletine treats rapid ventricular tachycardia and other ventricular arrhythmias in humans and dogs, especially with risk of heart block. Helps refractory pain and muscle stiffness of myotonic dystrophy. It is well absorbed, with rapid action, and has a narrow therapeutic dose range. Use in horses prohibited by equine control bodies.
Mianserin

Athimil, Athymil, Bolvidon, Lantanon, Lerivon, Mianserine, Norval, Tolvin, Tolvon

Banned

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Definition: Psychoactive

Information:

Mianserin was widely used internationally for its antidepressant, anxiolytic, hypnotic, anti-emetic, orexigenic and antihistamine effects. Phased out following the introduction of the analogue Mirtazapine. Can cause withdrawal signs and agranulocytosis. Not approved for animal use. High potential to affect performance.
Mibefradil

Mibefradil, Posicor

Banned

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Definition: Antihypertensive

Information:

Mibefradil was prescribed for hypertension and chronic angina pectoris. It inhibits liver metabolism of certain other drugs (antihistamines, Histamel, Statin) and therefore was withdrawn from the USA market. Not approved in animals; use in horses prohibited by equine control bodies.
Mibolerone

Cheque drops, Mibolerone

Banned

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Definition: Anabolic

Information:

Mibolerone is prescribed in veterinary medicine for oestrus suppression in bitches, and in some zoo species. It is used to treat false pregnancy, and to lengthen short oestrus cycles. Rapid effect and elimination led to abuse by athletes for increased aggression. Use in horses prohibited by equine control bodies.
Midazolam

Midazolam HCl, Hypnovel ampoules, Midazolam solution

Conditionally Permitted

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Definition: Sedative

Information:

Midazolam may be used to reduce anxiety, as a sedative and in an anaesthetic premedication.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Midodrine

Pro-Amiline, ProAmatine

Banned

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Definition: Vasopressor

Information:

Midodrone HCl is prescribed where persistent orthostatic hypotension interferes with normal living activities. Also used for dysautonomia and tachycardia. 80% of active metabolite undergoes active renal secretion. Not authorised for animals. Use in horses prohibited by equine control bodies.
Milrinone

Primacor

Banned

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Definition: Phosphodiesterase 3 inhibitor

Information:

Milrinone lactate is given for short term treatment of severe refractory congestive heart failure, and acute heart failure in dogs caused by dilated cardiomyopathy. Assists in ischaemic disease and is rapidly excreted (90% in 8 hours, 80% unchanged) through active renal secretion. Use in horses prohibited by equine control bodies.
Minoxidil

APO-Gain Topical solution, Loniten, Minoxidil, Rogaine tablets

Banned

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Definition: Vasodilator

Information:

Minoxidil is prescribed for severe refractory hypertension with target organ damage. It is also applied topically for androgenic alopecia. Rapid onset, half-life 4 hours, 90% metabolised. Not approved for animals. Use in horses prohibited by equine control bodies.
Mirtazepine

Avanza, Remeron, Zispin Soltab

Banned

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Definition: Antidepressant

Information:

Mirtazepine is prescribed for episodes of major depression. It is well absorbed and rapidly effective. It is extensively metabolised, with the demethylated product equally active. It is eliminated through urine and faeces. Not approved for animals. Use in horses prohibited by equine control bodies.
Mivacurium

Mivacron

Banned

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Definition: Muscle relaxant

Information:

Mivacurium chloride is used to facilitate intubation as a reversible adjunct to anaesthetic. It has a rapid onset and hydrolysis (half-life 2 minutes) to inactive metabolites; 95% recovered in 30 minutes. Not approved for use in animals. Use in horses prohibited by equine control bodies.
Modafanil

Cephalon tablets, Provigil

Banned

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Definition: Stimulant

Information:

Modafinil restores and improves daytime alertness and wakefulness. It opposes impaired psychomotor, cognitive, and other sensorial functions associated with narcolepsy, or obstructive sleep apnoea/hypopnoea, and chronic shift work sleep disorder. Use in horses prohibited by equine control bodies.
Moexipril

Cardiotensin, Femipres, Moex, Perdix, Primox

Banned

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Definition: Angiotensin-converting enzyme inhibitor

Information:

Moexipril HCl is effective in human and animals for relief of hypertension, and is often prescribed with thiazide diuretic. There is low bioavailability, rapid conversion to active drug, complex elimination through urine and faeces, and a mostly active compound (26% original prodrug). Use in horses prohibited by equine control bodies. Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Mofebutazone

Mofesal, Monozon, Reumatox

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

Mofebutazone has been used in human and animal medicine, in particular for the relief of painful musculoskeletal conditions. Use prohibited by all sport control bodies, including equine control bodies.
Molidustat

Banned

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Definition: Hypoxia Inducible Factor Activator

Information:

A drug which increases endogenous production of erythropoetin. It has no legitimate therapeutic indication in the equine athlete.
Molindone

Moban

Banned

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Definition: Antipsychotic

Information:

Molindone is prescribed specifically for the treatment of acute and chronic schizophrenia. It is rapidly absorbed and effective for 24 to 36 hours. 23% excreted unchanged in urine and faeces. Not approved for animals. Use in horses prohibited by equine control bodies.
Mometasone

Asmanex Twisthaler inhalation powder, Elocon cream, Elocon ointment, Nasonex nasal spray, PMS-Mometasone, Taro-mometasone

Banned

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Definition: Corticosteroid

Information:

Mometasone furoate is prescribed for intranasal application to treat and prevent seasonal or perennial allergic rhinitis, and nasal polyps. It is used topically to relieve inflammation and pruritis of dermatoses, and orally for maintenance treatment of persistent asthma. Use in horses is prohibited by equine control bodies.
Montelukast

Brondilat, Montelast, Singulair, Singular

Banned

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Definition: Leucotriene receptor antagonist - asthma treatment

Information:

Montelukast sodium is prescribed for chronic asthma treatment and prophylaxis. It is used to prevent exercise induced bronchoconstriction, and to relieve the symptoms of allergic rhinitis. It is rapidly absorbed, and highly protein-bound, with biliary excretion. Use in horses prohibited by equine control bodies.
Moperone

Luvatren

Banned

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Definition: Antipsychotic

Information:

Moperone chlorhydrate (HCl) has been prescribed for psychomotor excitation, chronic and acute psychosis, mental confusion, delirium, schizophrenia, vomiting, abnormal motion, and for ophthalmic application to reduce intra-ocular pressure in glaucoma. Use in horses prohibited by equine control bodies.
Moprolol

Levotensin, Omeral

Banned

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Definition: Beta blocker

Information:

Moprolol tartrate has been used to treat cardiac arrhythmia, hypertension, angina pectoris, hyperthyroid effects, acute myocardial ischaemia, and infarction, and idiopathic dilated cardiomyopathy. It is rapidly absorbed and active, with a half-life of 3 to 4 hours. Renal excretion of inactive metabolites. High potential to affect performance.
Morphedrine

Trade names are not currently listed on this site.

Banned

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Definition: Stimulant

Information:

Morphedrine produces central nervous and cardiovascular stimulation with increased coronary and cerebral blood flow and greater skeletal muscle power. Prohibited by equine control bodies.
Morpheridine

Trade names are not currently listed on this site.

Banned

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Definition: Analgesic

Information:

Morpheridine is a strong analgesic with opiod side effects such as respiratory depression and sedation. It is not currently used in medicine.
Morphine

Avinza, Duramorph, Kadian, Morphalgin, Morphine sulphate injection, MS-Contin, MST Continus, Oramorph, Roxanol, Sevredol

Conditionally Permitted

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Definition: Opioid

Information:

Morphine may be used to relieve pain.

Morphine is a Specified Substance. Specified Substances should not in any way be considered less important or less dangerous than other Prohibited Substances. Rather, they are simply substances which are more likely to have been ingested by Horses for a purpose other than the enhancement of sport performance, for example, through a contaminated food substance.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Mosapramine

Trade names are not currently listed on this site.

Banned

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Definition: Antipsychotic

Information:

Mosapramine is not approved for animal treatment.
Moxaverine

Certonal, Eupaverin, Eupaverine, Eupaverina, Kollateral

Banned

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Definition: Phosphodiesterase inhibition

Information:

Moxaverine is used to treat perfusion abnormalities of the brain, heart and extremities, and to reduce arterial spasms and ischaemia. It is used in functional disorders of the gut, bile duct and ureter to reduce spasms, and improves ocular perfusion in degenerative conditions. Significant potential to improve performance.
Muscarine

Trade names are not currently listed on this site.

Banned

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Definition: Parasympathomimetic

Information:

Muscarine has no therapeutic indication in humans or animals. Use in horses prohibited by equine control bodies. Muscarine is a Specified Substance. Specified Substances should not in any way be considered less important or less dangerous than other Prohibited Substances. Rather, they are simply substances which are more likely to have been ingested by Horses for a purpose other than the enhancement of sport performance, for example, through a contaminated food substance.
Myoinosital tripyrophosphate

Banned

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Definition: Pyrophosphate

Information:

A drug which increases tissue oxygenation and also known as myo-inositol trispyrophosphate (ITTP). It has no legitimate therapeutic indication in the equine athlete.
N-butyl Scopolamine

Buscopan

Conditionally Permitted

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Definition: Anticholinergic

Information:

N-butylscopolamine may be used in the treatment of abdominal spasms such as colic.

The detection time is estimated with 24 hours (1 day) after intra-venous administration.

Please remember: A detection time is not the same as a withdrawal time. The detection time is the approximate period of time for which a substance (or its metabolite) remains in a horse's system such that it can be detected by the laboratory. The withdrawal time for a substance adds a safety margin, chosen with professional judgment and discretion to allow for individual differences between horses such as size, metabolism, degree of fitness, recent illness or disease etc. You are advised to seek suitable advice from your treating veterinarian.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Nabumetone

Gen-Nabumetone, Relafen, Relifex tablets, Suspension

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

Nabumetone is prescribed for anti-inflammatory and analgesia support in osteo-arthritis and rheumatoid arthritis. It is well distributed in inflamed tissues, and carries the risk of cardiovascular thrombosis, myocardial infarction, stroke and gut disturbance. It is not approved for use in animals. Use in horses is prohibited by equine control bodies.
Nadolol

Corgard

Banned

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Definition: Beta blocker

Information:

Nadol was prescribed for prolonged action in treatment of stable chronic angina, tachyarrhythmias, moderate hypertension, thyrotoxicosis and for migraine prophylaxis. Absorption poor and variable, and is excreted unchanged mostly in urine. Use in horses prohibited by equine control bodies.
Nadoxolol

Bradyl

Banned

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Definition: Anti-arrhythmic

Information:

Nadoxolol has been prescribed for angina, cardiac arrhythmias, other cardiac conditions, and migraine prophylaxis. It is absorbed well through intra-nasal application as this avoids poor gut absorption and allows its rapid metabolism. Poisoning cases have occurred. High potential to affect performance.
Naepaine

Banned

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Definition: Local anaesthetic

Information:

Originally used for localised pain relief, Naepaine is applied topically for mouth ulcers and infections, and to neuromas and amputation stump neuromas (it may be injected with steroid mix). It is used for skin lesions, and in visco-elastic eye preparations for good delivery to deeper tissues for surgery. Its use in horses is prohibited by equine control bodies.
Naftidrofuryl

Dusodril, Nafronyl, Praxilene

Banned

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Definition: Vasodilator

Information:

Naftidrofuryl helps in the management of peripheral and cerebral vascular disorders, incipient gangrene, trophic ulcers, diabetic ateriopathy, muscle cramp, and cerebral vascular insufficiency leading to mental deterioration. It has a variably rapid absorption and metabolism (half-life 1 hour). Significant potential to affect performance.
Nalbuphine

Nubain

Banned

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Definition: Opiod analgesic

Information:

Nalbuphine is used for post-operative analgesia (human and animal), in human obstetrics, and higher doses supplement general anaesthesia. It is less effective in men and was discontinued in 2003. It reverses the adverse opioid effects in small animals, gives marked sedation, and has a rapid onset. Its use in horses is prohibited by equine control bodies.
Nalmefene

Selincro

Banned

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Definition: Opioid antagonist

Information:

Nalmefene is a substance with sedative effects and used to treat substance dependency in people.
Nalorphine

Nalline

Banned

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Definition: Opiod receptor agonist and antagonist

Information:

Nalorphine is a drug that was previously used to test opioid dependency, or to counter the effects of opioids like morphine or heroin. No legitimate therapeutic use in the equine athlete. High possibility of affecting performance.
Naloxone

Naloxone HCl, Narcanti, Nexodal, Suboxone

Conditionally Permitted

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Definition: Opioid antagonist

Information:

Naloxone may be used to reverse the effects of opioid medication.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Naltrexone

Naltrexon Vitaflo, Revia, Relistol, Vivitrol

Banned

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Definition: Opiod receptor antagonist

Information:

Naltrexone is a drug used to counter the effects of opioids like morphine or heroin, and used mainly to treat opioid or alcohold dependency. No legitimate therapeutic use in the equine athlete. High possibility of affecting performance.
Nandrolone (Nortestosterone)

Deca-Durabolin, Durabolin, Laurabolin, Nandrolin

Banned

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Definition: Anabolic

Information:

Nandrolone (19-nortestosterone) is an anabolic steroid that may be present naturally in the body, albeit in minute quantities. Used to be a treatment of osteoporosis in postmenopausal women, and was used in the treatment of some anaemias, but it is no longer recommended. Used in veterinary medicine in katabolic disease states, for example following surgery, or in newborn animals. Rarely used in therapeutic interventions in horses. Also misused in equine athletes to enhance muscle development. High possibility of affecting performance.
Naphazoline

Clearine, Coldan, Murine Eye Drops, Naphcon, Naphcon Forte, Privine, Rhino-Mex-N, Transpulmina Rino, Vasocon

Banned

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Definition: Sympathomimetic

Information:

It is a sympathomimetic drug that reduces blood flow, and is used to reduce swelling in mucous membranes. It is therefore used in eye drops to relieve redness and swelling. May also have systemic effects in the body (higher blood pressure, increased heart rate and reactivity).
Naproxen

Apranax, Flanax, Floxalin, Madaprox, Naixan, Napren, Naprogesic, Naprosyn, Novo-Naprox, Synflex, Xenar

Conditionally Permitted

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Definition: Non-steroidal anti-inflammatory

Information:

Naproxen may be used to relieve pain, inflammation and control fever.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Naratriptan

Amerge, Naramig

Banned

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Definition: 5-hydroxytryptamine agonist (migraine treatment)

Information:

Naratriptan is used for the treatment of acute migraine attacks in humans. Side effects include dizziness, drowsiness, tingling of the hands or feet, unusual tiredness, nausea, dry mouth and unsteadiness. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete.
Nebivolol

Bystolic, Nebilet, Hypoloc, Nebivolol

Banned

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Definition: Beta blocker

Information:

Nebivolol lowers blood pressure by dilating vasculature, and by increasing cardiac output. It is used in humans patients with hypertension or heart disease. Betablockers may cause the side effects of slow heartbeat and depression and may have potential to modify behaviour. Not registered for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. Moderate possibility of affecting performance.
Nedocromil

Alocril, Tilade

Banned

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Definition: Mast cell stabiliser

Information:

Nedocromil is used for controlling symptoms in asthmatic and allergic patients. It is used as an inhaler product for breathing symptoms, and as an ophthalmic solution for eyes. Not approved for use in veterinary medicine, but it has occasionally been used in dogs and cats with asthma, and in horses with heaves as a maintenance therapy, although the benefits of this treatment option remain unclear.
Nefazodone

Serzone, Nefadar

Banned

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Definition: Psychoactive

Information:

Nefazodone is a psychoactive drug (serotonin re-uptake inhibitor) used in the treatment of depression in humans. Its sale has been discontinued in many countries, like the USA, and many European countries. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. High possibility of affecting performance.
Nefopam

Acupan

Banned

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Definition: Non opiod analgesic

Information:

Nefopam is a centrally acting non-opioid analgesic drug that is used for treating moderate to severe pain alone, or in conjunction with opioid pain relief. May cause drowsiness and blurred vision as side effects. Not approved for use in veterinary medicine. No reported medical use in equines. Potential to influence performance is high.
Neostigmine

Neostigmin, Glycostigmin

Conditionally Permitted

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Definition: Parasympathomimetic

Information:

Neostigmine may be used in the treatment of gastrointestinal tract diseases.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Neridronate

Banned

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Definition: Bone metabolism agent

Information:

A bisphosphonate drug used for the treatment of Pagets disease. It is considered a risk to equine welfare and has no legitimate therapeutic indication in the equine athlete
Nialamide

Niamid, Espril

Banned

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Definition: Antidepressant

Information:

An antidepressant of the mono-amine oxidase inhibitor class, that is no longer available in the EU or the USA. It is used to treat depressive disorders in humans. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. Potential to influence performance is moderate.
Nicardipine

Cardene

Banned

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Definition: Antihypertensive

Information:

A calcium blocker that is used to treat hypertension patients, angina pectoris and vascular spasms in humans. Not approved, and not normally used, in equine veterinary medicine.
Nicotine

Nicorette, Habitrol, Nicorol, Nicotinell

Banned

Click to expand

Definition: Stimulant

Information:

Used in old insecticides, but used medicinally in smoking cessation. The substance acts as a stimulant and relaxant in mammals, and is the main factor responsible for the dependency forming properties of tobacco smoking. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. Potential to influence performance is high.
Nicoumalone

Sintrom, Sinthrome

Banned

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Definition: Anticoagulant

Information:

Not commercially available for medicinal use in the USA or EU. Anticoagulants prevent harmful clots from forming in the blood vessels, for example, in stroke patients, or in individuals with vein thrombosis or pulmonary embolism. It is sometimes used in the treatment of horses with general infection related blood clotting, although that treatment is controversial. The more usual exposure of horses to this class of substances (dicoumarol derivatives) is through ingestion of rodenticides or moldy sweetclover.
Nifedipine

Adalat, Nical, Nifedipin, Procardia

Banned

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Definition: Anti-angina

Information:

A calcium blocker used to treat hypertension patients, angina pectoris and vascular spasms in humans. Not approved for use in veterinary medicine.
Nifenalol

Impeasel, Inpea

Banned

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Definition: Beta blocker

Information:

Nifenalol is a beta-adrenergic antagonist (beta blocker) not commercially available for medical use. Beta-blockers may cause slow heartbeat and depression as side effects, and may have potential to modify behaviour. Not registered for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. Moderate possibility of affecting performance.
Niflumic acid

Nifluril

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

A non-steroidal painkiller used to treat muscle and joint pain, for example, in rheumatoid arthritis. Not commercially available for medical use in the USA or EU. Not approved for use in veterinary medicine.
Nikethamide

Cardiamine, Cora, Coramina, Coramine, Corazone, Cormed, Kardonyl, Percoral

Banned

Click to expand

Definition: Stimulant

Information:

A stimulant with a strong effect on the respiratory system. It was previously used in tracheal intubation of surgery patients, but no longer has any medicinal use. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. Potential to influence performance is high.
Nimesulide

Nimovet, Nimed, Sulidene

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

A painkiller and antipyretic drug used in humans and in veterinary medicine. Not available in some European countries, USA or Singapore. Use in horses is contraindicated.
Nimetazepam

Erimin

Banned

Click to expand

Definition: Anxiolytic

Information:

It is a hypnotic, anxiolytic and sedative drug, which is also commonly used by drug abusers. Not commercially available for medicinal use in the EU or USA, but it is in Japan. As a benzodiazepine derivative, it could be used as a sedative, and to induce anaesthesia in horses, but it is not common. High possibility of affecting performance.
Nimodipine

Nimodipine, Nimotop

Banned

Click to expand

Definition: Antihypertensive

Information:

A calcium blocker used to treat hypertension patients, and cerebral bleeding (vasospasms) in humans. Not approved for use in veterinary medicine.
Nitrazepam

Insomin, Dormalon, Nitravet, Mogadon

Banned

Click to expand

Definition: Anxiolytic

Information:

It is benzodiazepine class hypnotic drug with sedative, anxiolytic, anticonvulsant and skeletal muscle relaxant properties. Not approved for use in veterinary medicine. Only available commercially for oral administration, so although possible, its use in equine sedation and anaesthesia is very unlikely. High possibility of affecting performance.
Nitroglycerin

Nitroglycerin, Nitromist, Nitrostat, Minitran

Conditionally Permitted

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Definition: Vasodilator

Information:

Nitroglycerin may be used in the treatment of laminitis.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Nomifensine

Alival, Nomival

Banned

Click to expand

Definition: Dopamine re-uptake inhibitor

Information:

No longer commercially available for medical use due to side effects. It was used as an antidepressive, but also causes agitation through stimulation of the central nervous system. No legitimate therapeutic indication in the equine athlete. Potential to influence performance is high.
Nonivamide

ABC Hydrogel-Warmepflaster, ABC Warme-Pflaster Sensitive, Gothaplast Capsicum-Warmepflaster, Hansaplast ABC Warme-Pflaster Sensitive

Banned

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Definition: Topical analgesic/irritant

Information:

Present in chilli peppers, but commonly manufactured synthetically. Nonivamide is used as a food additive in seasonings, flavourings, and spice blends. It is also used in confectionery industry to create hot sensation, in cosmetic products, and in the pharmaceutical industry in some formulations. Equines may be exposed to this substance through skin ointments. May be used to sensitize the skin. No therapeutic indication in the equine athlete. Potential to influence performance is moderate.
Norandrostenediol

Banned

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Definition: Anabolic

Information:

An anabolic testosterone precursor, it has been used by bodybuilders and athletes to provide the anabolic benefits of taking an anabolic steroid, without the legal risks. Nowadays, however, it also classified as an illegal drug, for example in the USA. No legitimate therapeutic indication in the equine athlete. Potential to influence performance is high.
Norandrostenedione

19-N-Andro, Bolandione, Proven Pure 19-Norandrostenedione

Banned

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Definition: Anabolic

Information:

A prohormone that converts to nandrolone, it has been used by bodybuilders and athletes to provide the anabolic benefits of taking an anabolic steroid, without the legal risks, but is now classified as an illegal drug, for example in the USA. No legitimate therapeutic indication in the equine athlete. Potential to influence performance is high.
Norbolethone

Genabol

Banned

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Definition: Anabolic

Information:

An anabolic steroid that is not commercially available for medicinal use. Has been misused by human athletes. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. Potential to influence performance is high.
Norclostebol

Anabol 4-19

Banned

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Definition: Anabolic

Information:

An illegal anabolic steroid that was identified on the European black market in the late 1990s and possibly used in the breeding of cattle. Not available commercially, or for medicinal use. No legitimate therapeutic indication in the equine athlete. Potential to influence performance is high.
Norcocaine

Banned

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Definition: Cocaine metabolite

Information:

It is the pharmacologically active metabolite of cocaine, which is a stimulant of the central nervous system. Not in medical use. It is researched for its effects as a local anaesthetic. No legitimate therapeutic indication in the equine athlete. Potential to influence performance is high.
Nordiazepam

Stilny, Vegesan, Calmday

Banned

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Definition: Tranquiliser

Information:

A benzodiazepam class drug used in the relief of anxiety. Not commercially available for medical use, for example in the USA or EU. Could be used in the sedation of horses, but is not common practice.
Norepinephrine (noradrenaline)

Conditionally Permitted

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Definition: Hormone

Information:

Norepinephrine (noradrenaline) may be used in the treatment of anaphylaxis and hypotension.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Norethandrolone

Nilevar

Banned

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Definition: Anabolic

Information:

Norethandrolone is a derivative of nandrolone. Not in medicinal use. No legitimate therapeutic indication in the equine athlete. Potential to influence performance is high.
Norfenefrine

Energona, Esbuphon, Molycor-R, Nevadral, Norenol, Normetol, Novadral, Stagural, Vingsal, Zondel

Banned

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Definition: Stimulant

Information:

A cardiac sympathomimetic stimulant no longer used in medicine. Increases blood pressure and heart rate. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. Potential to influence performance is high.
Norfenfluramine

Banned

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Definition: Stimulant

Information:

Norfenfluramine is a psychoactive drug that also has effects on the vasculature. No medicinal use. No legitimate therapeutic indication in the equine athlete. Potential to influence performance is high.
Norfluoxetine

Banned

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Definition: Fluoxetine metabolite

Information:

Fluoxetine is used in the treatment of severe depression in humans. Norfluoxetine is its active metabolite. Like fluoxetine, norfluoxetine functions as a serotonin re-uptake inhibitor (SRI). No legitimate therapeutic indication in the equine athlete. Potential to influence performance is high.
Normethandrolone

Orga-Steron

Banned

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Definition: Anabolic

Information:

Normethandrolone is a derivative of nandrolone. Not in medicinal use. No legitimate therapeutic indication in the equine athlete. Potential to influence performance is high.
Norpseudoephedrine (Cathine)

Adiposetten, Amorphan, Appetrol, Dietene, Miniscap, Minusin Depot, Mirapront N, Neo-Soldana, Nobese, Reduform, Thinz

Banned

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Definition: Stimulant

Information:

Norpseudoephedrine is an adrenaline releasing drug with psychoactive properties. It is classified as an illegal drug in many countries. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. Potential to influence performance is high.
Nortestosterone (Nandrolone)

See Nandrolone

Banned

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Definition: Anabolic

Information:

See Nandrolone
Nortriptyline

Nortriptyline Hydrochloride, Aventyl, Pamelor, Noritren

Banned

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Definition: Antidepressant

Information:

A tricyclic antidepressant used in the treatment of major depression, and occasionally used also for chronic illnesses such as chronic fatigue syndrome, chronic pain and migraines, and in some neurological conditions in humans. Not approved for use in veterinary medicine. No legitimate therapeutic indication in the equine athlete. Potential to influence performance is high.
Noscapine

Anarcotine, Narcotine, Nectodon, Nospen

Banned

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Definition: Antitussive

Information:

It is used as a cough suppressant.
Nylidrin (Buphenine)

Arlibide, Arlidin, Diatolil, Dilatol, Dilydrin, Dilydrine Retard, Opino, Penitardon, Perdilatal Forte, Tocodilydrin, Tocodrine

Banned

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Definition: Sympathomimetic

Information:

Sympathomimetic and beta adrenergic agonist. It causes peripheral vasodilation and has a positive ionotropic effect. It may affect performance.
Octadecafluoronaphthalene (Perfluorodecalin)

Banned

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Definition: Artificial gas carriers in blood

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Octopamine

Norden, Norfen, Norphen

Banned

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Definition: Stimulant

Information:

Used as a slimming aid in humans, as it may encourage mobilisation of fat.
Olanzapine

Olzapin, Rexapin, Zyprexa, Zyprexa, Zydis, Zalasta, Zolafren

Banned

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Definition: Antipsychotic

Information:

It is used for the treatment of schizophrenia and bipolar disorders.
Olmesartan

Benicar, Olmetec, Votum

Banned

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Definition: Antihypertensive

Information:

Used to treat high blood pressure in humans by causing vasodilation. Also used to treat sarcoidosis in humans.
Olodaterol

Conditionally Permitted

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Definition: Bronchodilator

Information:

Olodaterol may be used in the treatment of respiratory diseases.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Olpadronate

Banned

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Definition: Bone metabolism agent

Information:

A bisphosphonate drug considered a risk to equine welfare and has no legitimate therapeutic indication in the equine athlete.
Olsalazine

Dipentum

Banned

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Definition: Gut anti-inflammatory

Information:

Used in the treatment of inflammatory bowel disease such as ulcerative colitis.
Omeprazole

Gastroguard

Permitted

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Information:

The maximum permitted plasma concentration of Omeprazole is 10 nanograms per milliliter.

When omeprazole is administered, the dose should be accurately calculated according to the weight of the horse. The contents of one syringe will dose a 1250 lb (568 kg) horse at the rate of 1.8 mg omeprazole/lb body weight (4 mg/kg). For the treatment of gastric ulcers, each weight marking on the syringe plunger will deliver sufficient omeprazole to treat 250 lb (114 kg) body weight. For prevention of recurrence of gastric ulcers, each weight marking will deliver sufficient omeprazole to dose 500 lb (227 kg) body weight.

To deliver the treatment at a dose rate of 1.8 mg omeprazole/lb body weight (4 mg/kg), set the syringe plunger to the appropriate weight marking according to the horse's weight in pounds.

To deliver at the dose rate of 0.9 mg/lb (2 mg/kg) to prevent recurrence of ulcers, set the syringe plunger to the weight marking corresponding to half of the horse's weight in pounds.

Doses should be given 24 hours apart. No part of a dose should be administered during the 4 hours prior to competing.
Opiates (class of drugs)

Conditionally Permitted

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Information:

Some drugs in this classification are considered prohibited and therefore NOT accepted with a Medications Report Form.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Opipramol

Ensidon, Insidon, Oprimol, Pramolan

Banned

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Definition: Psychoactive

Information:

Opipramol is used in human medicine for the treatment of generalized anxiety disorder (GAD).
Opromazine

Banned

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Definition: Antipsychotics

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Orciprenaline

Alotec, Alupent, Metaprel, Metaproterenol, Novasmasol

Banned

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Definition: Bronchodilator

Information:

Used in the treament of asthma in humans.
Oripavine

Banned

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Definition: Opiod analgesic

Information:

Not used clinically, as it has a very narrow therapeutic margin and high toxicity. It is addictive, but less so than morphine.

Oripavine is a Specified Substance. Specified Substances should not in any way be considered less important or less dangerous than other Prohibited Substances. Rather, they are simply substances which are more likely to have been ingested by Horses for a purpose other than the enhancement of sport performance, for example, through a contaminated food substance.
Orphenadrine

Banflex, Biorphen, Brocasipal, Disipal, Flexon, Mephenamin, Norflex

Banned

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Definition: Antihistamine

Information:

Used to potentiate effects of other analgesics for pain relief. Used for relieving muscle spasms in conditions such as lumbago and sciatica. Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Osterine

Enobosarm

Banned

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Definition: Selective Androgen Receptor Modulator (SARM)

Information:

Osterine is a selective androgen receptor agonist. The substance causes similar effects to anabolic steroids, resulting in muscle growth and increased muscle mass. Osterine was initially developed to treat muscle-wasting diseases.
Oxabolone

Steranabol Depot, Steranabol Ritardo

Banned

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Definition: Anabolic

Information:

It is used for muscle growth; it can cause an exageration of male characteristics.
Oxaflumazine

Banned

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Definition: Psychosedative

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Oxandrolone

Oxandrin

Banned

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Definition: Anabolic

Information:

Used for promoting muscle mass in conditions of weight loss, such as patients with HIV, Turner's syndrome and alcohol induced hepatitis. It has been abused by body builders, making it a schedule III drug.
Oxaprozin

Daypro, Duraprox

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

Used in humans to treat osteoarthritis and osteoporosis.
Oxazepam

Alepam, Medopam, Murelax, Noripam, Ox-Pam, Purata, Serax, Serepax

Conditionally Permitted

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Definition: Sedative

Information:

Oxazepam may be used to reduce anxiety and as a sedative.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Oxazolam

Convertal, Hializan, Serenal, Tranquit

Banned

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Definition: Anxiolytic

Information:

It is used for the treatment of anxiety. Not routinely used in horses.
Oxcarbazepine

Oxaleptal, Trileptal

Banned

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Definition: Anticonvulsant

Information:

Used in humans with epilepsy, and for mood stabilising and benign motor tics.
Oxethazaine

Intracoat

Banned

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Definition: Topical anaesthetic

Information:

Used in treatment of humans with heartburn, and duodenal and gastric ulceration.
Oxilofrine (Hydroxyephedrine)

Banned

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Definition: Stimulant

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Oxolamine

Bredon, Oxolev, Tussibron

Banned

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Definition: Antitussive

Information:

It is used as a cough treatment.
Oxprenolol

Captol, Corbeton, Coretal, Laracor, Slow-Pren, Slow-Trasicor, Tevacor, Trasacor, Trasicor, Trasitensin, Trasidex

Banned

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Definition: Beta blocker

Information:

It is used for the treatment of angina pectoris and abnormal heart rhythms. It is also used for treating high blood pressure.
Oxybuprocaine

Novesin, Novesine

Banned

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Definition: Local anaesthetic

Information:

It is used in ophthalmology and otolaryngology in human medicine.
Oxycodone

Endocet, Endodan, OxyContin, OxyIR, Percocet, Percodan, Roxicodone, Roxicet, Roxiprin, Tylox

Banned

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Definition: Opiod analgesic

Information:

Used for pain relief in humans in a form which is taken orally.
Oxyguno

Banned

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Definition: Anabolic

Information:

A synthetic anabolic steroid with no legitimate therapeutic indication in the equine athlete.
Oxymesterone

Anamidol

Banned

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Definition: Anabolic

Information:

Used in human medicine to replace testosterone and treat rare forms of aplastic anaemia. Misused by body builders.
Oxymetazoline

Afrin, Dristan, Mucinex Full Force, Vicks Sinex

Banned

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Definition: Topical decongestant

Information:

It is used as a topical decongestant. It is also used to treat epistaxis (nose bleeds), and eye redness caused by minor irritation.
Oxymetholone

Adroyd, Anadrol, Anadroyd, Anapolon, Anasteron, Anasteronal, Nastenon, Pardroyd, Plenastril, Synasteron, Zenalosyn

Banned

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Definition: Anabolic

Information:

It is used for the treatment of anaemias.
Oxymorphone

Numorphan, Nucodan, Opana

Banned

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Definition: Opiod analgesic

Information:

Used for pain relief in humans.
Oxypertine

Banned

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Definition: Neuroleptic

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Oxyphenbutazone

Butafen, Californit, Phlogont, Tandearil, Tanderil

Conditionally Permitted

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Definition: Non-steroidal anti-inflammatory

Information:

Oxyphenbutazone may be used to relieve pain, inflammation and control fever. It is a metabolite of phenylbutazone, a Controlled Medication.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Oxyphencyclimine

Daricon

Banned

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Definition: Antimuscarinic

Information:

Used for treatment of peptic ulcers in humans.
Oxyphenonium

Antrenyl, Argicillin, Endiform, DCF Oxyphenonium, Spastrex

Banned

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Definition: Antimuscarinic

Information:

Used for treatment of peptic ulcers in humans and to relieve visceral spasms.
Oxytocin

Conditionally Permitted

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Definition: Hormone

Information:

Oxytocin may stimulate uterine contractions and lactation.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Paliperidone

Invega Sustenna

Banned

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Definition: Antipsychotic

Information:

Used for the treatment of schizophrenia in humans.
Palmitoylethanolamid (PEA)

Conditionally Permitted

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Definition: Analgesic

Information:

Palmitoylethanolamid (PEA) may be used to relieve pain and inflammation.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Pamidronate

Aredia, Pamimed

Banned

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Definition: Bone metabolism agent

Information:

A bisphosphonate drug used for the treatment of osteoporosis. It is considered a risk to equine welfare and has no legitimate therapeutic indication in the equine athlete.
Pancuronium

Bemicin, Bromurex, Curon-B, Minopres, Panconium, Pancuron, Pancuronium, Parulon, Pavulon, Pavulone, Plumger

Banned

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Definition: Muscle relaxant

Information:

One of the drugs administered in the USA in the lethal injection.
Papaverine

Artegodan, Ceraspan, Opdensit, Optenyl, Pameion, Panergon, Pavacap, Pavacen, Pavakey, Pavatym, Paveron, Qua Bid

Banned

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Definition: Opiate - muscle spasm treatment

Information:

Used in the treatment of visceral spasms and vasospasms (involving the heart and brain) in humans. It is occasionally used in the treatment of erectile dysfunction in humans.

Papaverine is a Specified Substance. Specified Substances should not in any way be considered less important or less dangerous than other Prohibited Substances. Rather, they are simply substances which are more likely to have been ingested by Horses for a purpose other than the enhancement of sport performance, for example, through a contaminated food substance.
Paracetamol (Acetaminophen)

Anacin, Panadol, Paracetamol, Tempra, Tylenol

Conditionally Permitted

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Definition: Analgesic

Information:

Paracetamol (Acetaminophen) may be used to relieve pain and control fever.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Paraldehyde

Paral

Banned

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Definition: Anticonvulsant

Information:

Used to treat status epilepticus in humans, and was used on psychiatric wards to induce sleep in patients suffering from delirium tremens.
Paramethadione

Banned

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Definition: Anabolic

Information:

Caused birth defects in humans in case where mothers had taken the drug as an anticonvulsant during pregnancy.
Paramethasone

Cortidene, Depodillar, Dillar, Haldrone, Metilar, Monocortin, Paramezone, Triniol

Banned

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Definition: Corticosteroid

Information:

Used as an anti-inflammatory. Not used routinely in equids.
Paraxanthine

Conditionally Permitted

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Definition: Stimulant

Information:

Paraxanthine may simulate the central nervous system and is a metabolite of caffeine, a Controlled Medication.

Paraxanthine is a Specified Substance. Specified Substances should not in any way be considered less important or less dangerous than other Prohibited Substances. Rather, they are simply substances which are more likely to have been ingested by Horses for a purpose other than the enhancement of sport performance, for example, through a contaminated food substance.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Pargyline

Eudatin, Eutonyl, Eutonyl-Ten, Supirdyl

Banned

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Definition: Mono-amine oxidase inhibitor

Information:

It is used for the treatment of hypertension.
Paroxetine

Aropax, Aroxat, Cebrilin, Deroxat, Eutimil, Paroxetine, Seroxat

Banned

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Definition: Antidepressant

Information:

It is used for the treatment of depression and panic attacks.
Pemoline

Cylert, Deltamine, Dynalert, Hyton ASA, Kethamed, Pemoline, Ronyl, Sigmadyn, Stimul, Tradon, Volital

Banned

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Definition: Stimulant

Information:

It is used for the treatment of hyperkinetic states in children.
Pempidine

Perolysen

Banned

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Definition: Ganglionic blocker

Information:

It is used for the treatment of severe and malignant hypertension.
Penbutolol

Betapresin, Betapressin, Blocotin, Ipobar, Levatol, Lobeta

Banned

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Definition: Beta blocker

Information:

It is used for the treatment of hypertension and cardiac disorders.
Penfluridol

Cyperon, Flupidol, Semap

Banned

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Definition: Antipsychotic

Information:

It is used for the treatment of schizophrenia and similar psychotic disorders.
Pentaerythritol Tetranitrate

Antime, Cardiacap, cordilate, Dilcoran, Duotrate, Lentrat, Metranil, Mycardol, Mycartal, Niscodil, Nitrodex, Nitropent, Penritol, Pentafin, Pentanitrine, Pentral, Pentrit, Pentryate, Peritrate, Petrin, Quintrate

Banned

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Definition: Vasodilator

Information:

It is used for the treatment of angina pectoris.
Pentazocine

Fortral, Fortwin, Liticon, Pentafen, Pentalgina, Pentawin

Banned

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Definition: Narcotic

Information:

It is used for the treatment of moderate to severe pain.
Pentetrazol

Cardiazol, Cardiorapide, Metrazol

Banned

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Definition: Stimulant

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Pentifylline

Cosadon, Cosaldon

Banned

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Definition: Vasodilator

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Pentobarbital

Embutal, Nembutal, Neodorm, Pentobarbital, Pentone, Sagatal, Sopental

Banned

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Definition: Sedative

Information:

It is used in the premedication treatment in anaesthetic procedures.
Pentoxifylline

Azutretat, Claudicat, Durapental, Hemovas, Pento-Puren, Rentylin, Tarontal, Terental, Torental, Trental

Conditionally Permitted

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Definition: Vasoprotective

Information:

Pentoxifylline may be used in the treatment of vascular diseases.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Pentoxyverine (Carbetapentane)

Atussil, Germapect, Sedotussin, Toclase, Tussa-Tablinen

Banned

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Definition: Antitussive

Information:

It is used for the treatment of coughs.
Pentylenetetrazole (Leptazole)

Banned

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Definition: Stimulant

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Perfluorocarbons

Banned

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Definition: Artificial gas carriers in blood

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Perfluorodecalin (Octadecafluoronaphthalene)

Banned

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Definition: Artificial gas carriers in blood

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Perfluorooctylbromide

Banned

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Definition: Artificial gas carriers in blood

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Perfluorotripropylamine

Banned

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Definition: Artificial gas carriers in blood

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Pergolide Mesylate

Aroltex, Breator, Celance, Geranil, Nopar, Parkotil, Parlide, Pergolide, Permax, Pharken, Prascend

Conditionally Permitted

Click to expand

Definition: Dopamine agonist

Information:

Pergolide may be used in the treatment of Pituitary Pars Intermedia dysfunction (PPID), commonly known as Equine Cushings disease.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Periciazine (Pericyazine)

Aolept, Nemactil, Neulactil, Neuleptil

Banned

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Definition: Antipsychotic

Information:

It is used for the treatment of psychoses.
Pericyazine (Periciazine)

Aolept, Nemactil, Neulactil, Neuleptil

Banned

Click to expand

Definition: Antipsychotic

Information:

It is used for the treatment of psychoses.
Perindoprilat

Banned

Click to expand

Definition: Angiotensin-converting enzyme inhibitor

Information:

This is a substance deemed to have no legitimate use in equine medicine. Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Perinodopril

Banned

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Definition: Antihypertensive

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Perlapine

Hypnodin

Banned

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Definition: Hypnotic

Information:

It is used for the short term management of insomnia.
Perphenazine

Decentan, Fentazin, Perfenil, Phenazine, Trilafon, Trilifan

Banned

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Definition: Tranquiliser/phenothiazine derivative

Information:

It is used for the treatment of psychosis, and the management of nausea and vomiting.
Pethidine (Meperidine)

Centralgine, Demarol, Demerol, Dispadol, Dolantin, Dolcontral, Dolosal, Lidol, Lydol, Meperidol, Nemerol, Petantin, Pethanol, Pethidine, Petydyna, Piperosal, Piridosal

Banned

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Definition: Narcotic

Information:

It is used for the treatment of moderate to severe pain.
Phenacemide

Epiclase, Phenurone, Phetylureum

Banned

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Definition: Anticonvulsant

Information:

It is used for the treatment of epilepsy.
Phenacetin (Acetophenetidin)

Codempiral, Commotional, Contradouleur, Emprazil, P-A-C Compound, Paramette, Phenaphen Plus, Stellacyl, Thephorin A-C

Banned

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Definition: Analgesic

Information:

It has analgesic and antipyretic properties.
Phenaglycodol

Ultran-Lilly

Banned

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Definition: Tranquiliser

Information:

It is used for the treatment of anxiety.
Phenazocine

Narphen, Prinadol

Banned

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Definition: Opiod analgesic

Information:

It is used for the treatment of mild to moderate pain.
Phenazone

Aurafair Otic, Auralgicin, Auraltone, Sedaural, Tympagesic

Banned

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Definition: Analgesic

Information:

It has analgesic and antipyretic properties.
Phenazopyridine

Azodine, Phenazo, Pyridacil, Pyridium, Pyronium, Urogesic, Uropyrine

Banned

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Definition: Analgesic

Information:

It is used for the relief of pain associated with disorders and injuries in the urinary tract.
Phencyclidine

Banned

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Definition: Anaesthetic

Information:

It was formerly used in veterinary medicine as an immobiliser, and is widely abused in some countries as an hallucinogenic drug of abuse.
Phendimetrazine

Adipost, Anorex, Antapentan, Bacarate, Bontril, Hyrex-105, Melfiat, Obesan-X, Phenazine, Plegine, PT-105

Banned

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Definition: Stimulant

Information:

It is used for the short term treatment of moderate to severe obesity and as an anorectic.
Phenelzine

Nardelzine, Nardil, Phenalzine, Phenelezine, Stinerval

Banned

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Definition: Psychoactive

Information:

It is used for the treatment of depression.
Phenethylline (Fenethylline, Fenetylline, Phenetylline)

Biocapton, Captagon, Fitton

Banned

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Definition: Stimulant

Information:

It is used for the treatment of hyperactive children and narcolepsy.
Phenetylline(Fenethylline, Fenetylline, Phenethylline)

Biocapton, Captagon, Fitton

Banned

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Definition: Stimulant

Information:

It is used for the treatment of hyperactive children and narcolepsy.
Phenibut

Focus Calm Horse Supplement

Banned

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Definition: Central Nervous System depressant

Information:

Phenibut (β-phenyl gamma aminobutyric acid) is a derivative of GABA.
Phenindamine

Nolahist, Thephorin

Banned

Click to expand

Definition: Antihistamine

Information:

It is used for the treatment of common colds and allergies. Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Phenindione

Danilone, Dindevan, Emandione, Pindione

Banned

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Definition: Anticoagulant

Information:

It has similar uses and properties to those of Warfarin.
Pheniramine

Aviletten, Inhiston, Fenamine, Metron, Pyriton, Tripoton

Conditionally Permitted

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Definition: Antihistamine

Information:

Pheniramine may be used in the control of allergies.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Phenmetrazine

Preludin

Banned

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Definition: Stimulant

Information:

It was used as an appetite suppressant, but has been withdrawn from the market.
Phenobarbital

Aphenylbarbit, Aphenyletten, Comizial, Fenemal, Gardenale, Lethyl, Lumen, Luminaletten, Phenobarbitone, Sedofen, Solfoton

Banned

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Definition: Sedative

Information:

It is used in the treatment of epilepsy to control tonic-clonic and partial seizures.
Phenoxybenzamine

Dibenyline, Dibenzyline, Dibenzyran

Banned

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Definition: Antihypertensive

Information:

It is used in the treatment of hypertension.
Phenprocoumon

Liquamar, Marcoumar, Marcumar, Marcuphen, Phenpro

Banned

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Definition: Anticoagulant

Information:

It is used for the treatment and prophylaxis of thromboembolic disorders.
Phenpromethamine

Banned

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Definition: Stimulant

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Phensuximide

Milontin, Succitimal

Banned

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Definition: Muscle relaxant

Information:

It is used for the treatment of epilepsy.
Phentermine

Adipex, Duromine, Fastin, Lonamin, Minobese, Omnibex, Panbesy, Phentermine, Phentermyl, Teramine

Banned

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Definition: Anticonvulsant

Information:

Used as an anorectic for the short term treatment of moderate to severe obesity.
Phentolamine

Dibasin, Regitipe, Rigitine, Vasomax

Banned

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Definition: Vasodilator

Information:

It is used for the prevention of paroxysmal hypertension, and as a prophylaxis against catecholamine induced hypertensive crisis during surgery.
Phenylbutazone

Alqoverin, Artrizin, Artropan, Azolid, Butacote, Butadion, Butagesic, Butalgina, Butaphen, Butapirazol, Butartril, Butazolidin, Butazone, Bute, Butoz, Butrex, Diossidone, Equipalazone, Fenilbutina, Inflazone, Intrabutazone, Malgesic, Promifen, Phenylarthrite.

Permitted

Click to expand

Definition: Non-steroidal anti-inflammatory

Information:

Phenylbutazone may be used to relieve pain, inflammation and control fever.

The detection time is estimated with 168 hours (7 days) for all types of administration.

A detection time is not the same as a withdrawal time. The detection time is the approximate period of time for which a substance (or its metabolite) remains in a horse's system such that it can be detected by the laboratory. The withdrawal time for a substance adds a safety margin, chosen with professional judgment and discretion to allow for individual differences between horses such as size, metabolism, degree of fitness, recent illness or disease etc.. You are advised to seek suitable advice from your treating veterinarian.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

The maximum permitted plasma concentration of Phenylbutazone is 15.0 micrograms per milliliter.

When phenylbutazone is administered, the dose should be accurately calculated according to the actual weight of the horse. Every 24 hours, not more than 2.0 milligrams per pound of body weight should be administered, preferably less. For a 1000-pound horse, the maximum daily dose is 2.0 grams, which equals two 1.0-gram tablets, or two 1.0-gram units of paste, or 10.0 cc of the injectable (200 milligrams per milliliter). Neither a total daily dose nor part of an injectable dose should be administered during the 6 hours prior to competing. In the event the phenylbutazone is administered orally, half of the maximum daily dose (1.0 grams per 1000 lbs.) can be administered every 12 hours during a five-day treatment program. The maximum treatment time for phenylbutazone is five successive days.
Phenylephrine

Analux, Fenox, Isopto Frin, Minims Phenylephrine Hydrochloride, Mydfrin, Neo-Synephrine, Nostril, Prefrin, Visadron, Vistosan

Conditionally Permitted

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Definition: Stimulant

Information:

Phenylephrine may be used in the treatment of hypotension and some causes of colic.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Phenyliprazine

Banned

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Definition: Antidepressant

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Phenylpiracetam (Carphedon)

Phenotropil

Banned

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Definition: Stimulant

Information:

It increases physical stamina and provides improved tolerance to cold.
Phenylpropanolamine

Acutrim, Control, Dexatrim, Fugoa N, Kontexin, Monydrin, Procol, Propadrine, Propagest, Rhindecon, Rinexin

Banned

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Definition: Stimulant

Information:

It is used as treatment for the common cold and cough, and as an appetite suppressant. In veterinary medicine, it is used to control urinary incontinence in dogs.
Phenyltoloxamine

Antin, Bistrimin, Bristamin, Histionex

Banned

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Definition: Antihistamine

Information:

In combination with codeine, it is frequently used as a cough suppressant. Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Phenytoin

Antisacer, Citrullamon, Dantoine, Difhydan, Dilantin, Dintoina, Diphantoine, Epanutin, Epilantine, Labopal, Lehydan, Pyoredol, Solantyl, Toin Unicelles

Conditionally Permitted

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Definition: Anticonvulsant

Information:

Phenytoin may be used in the treatment of abnormal heart rhythms and muscle spasms.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Pholcodine

Actuss, Adaphol, Codisol, Dia-Tuss, Duro-Tuss, Galenphol, Homocodeine, Lantuss, Pavacol-D, Pholcolin, Tussinol, Tussokon, Tuxi

Banned

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Definition: Antitussive

Information:

It is used as a cough suppressant.
Pholedrine

Epifen, Isodrin, Isodrine, Isodrinum, Paredrinol, Pholetone, Promethin, Prometin, Pulsotyl, Stimatone, Sympropamin, Syncordan, Terapinyl, Varitol, Veritain, Veritol

Banned

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Definition: Stimulant

Information:

It is used for the treatment of shock and toxemia.
Physostigmine

Calabarine, Cogmine Eserine, Erserine, Eserine, Esromiotin, Ezerin, Isopto Eserine, Physostigmine 9599, Physostol

Conditionally Permitted

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Definition: Parasympathomimetic

Information:

Physostigmine may be used in the treatment of opthalmic disease.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Picrotoxin

Cocculin

Banned

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Definition: Stimulant

Information:

It is used for the relief of respiratory distress and as an antidote to poisoning by central nervous system (CNS) depressants.
Piminodine

Alvodine

Banned

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Definition: Opiod analgesic

Information:

It was used as an analgesic and sedative, but is no longer in clinical use.
Pimozide

Opiran, Orap, Orap Forte, Pizide

Banned

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Definition: Antipsychotic

Information:

It is used in the management of the Gilles de la Tourette's syndrome.
Pinazepam

Domar, Duna

Banned

Click to expand

Definition: Anxiolytic

Information:

It is used for the treatment of anxiety and sleep disturbances.
Pindolol

Barbloc, Betadren, Carvisken, Decreten, Durapindol, Hexapindol, Pectobloc, Pinbetol, Viskeen, Visken

Banned

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Definition: Beta blocker

Information:

It is used for the treatment of angina pectoris, hypertension arrhythmias and prophylaxis of acute stress reactions.
Pioglitazone

Actos

Conditionally Permitted

Click to expand

Definition: Anti-hyperglycaemic

Information:

Pioglitazone may be used in the treatment of equine metabolic syndrome.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Pipamazine

Banned

Click to expand

Definition: Anti-emetic/mild tranquiliser

Information:

It is used as an anti-emetic in the morning.
Pipamperone

Dipiperone, Propitan

Banned

Click to expand

Definition: Antipsychotic

Information:

It is used for the treatment of psychoses.
Pipecuronium

Aperomid, Arduan, Arpilon

Banned

Click to expand

Definition: Muscle relaxant

Information:

It is used during surgical procedures and anaesthesia as a muscle relaxant.
Pipenzolate

Expal, Piper, Piptal, Pipzen

Banned

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Definition: Antimuscarinic

Information:

It is used for the treatment of peptic ulcers and for the relief of visceral spasms.
Pipequaline

Banned

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Definition: Anxiolytic

Information:

Pipequaline is an anxiolytic under investigation.
Piper Methysticum

Kava

Banned

Click to expand

Definition: Anti-psychotic

Information:

Human anti-psychotic drug with high potential for abuse. Used in humans to treat stress, anxiety and insomnia.
Piperacetazine

Psymod, Quide

Banned

Click to expand

Definition: Sedative

Information:

Uses similar to those of Chlorpromazine.
Piperidione

Ascron, Sedilan, Sedulon, Tusseval

Banned

Click to expand

Definition: Anticholinergic

Information:

It is a cough suppressant with anticholinergic properties.
Piperidolate

Dactil, Crapinon, Edelel

Banned

Click to expand

Definition: Anticholinergic

Information:

It is given in the treatment of visceral spasms.
Piperocaine

Metycaine Hydrochloride

Banned

Click to expand

Definition: Local anaesthetic

Information:

It is used for infiltration anaesthesia, surface anaesthesia, and regional nerve block.
Piperoxan

Banned

Click to expand

Definition: Adrenergic blocker

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Pipotiazine

Lonseren, Piportil, Piportyl

Banned

Click to expand

Definition: Antipsychotic

Information:

It is used for the treatment of psychoses.
Pipradol (Pipradrol)

Meretran

Banned

Click to expand

Definition: Stimulant

Information:

It is used for the treatment of obesity, narcolepsy, and the symptoms of senile dementia.
Piquindone

Trade names are not currently listed on this site.

Banned

Click to expand

Definition: Antipsychotic

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Piracetam

Avigilen, Cerebroforte, Cerebropan, Cerebrosteril, Cetam, Ciclofalina, Cuxabrain, Durapitrop, Encetrop, Memo-Puren, Noostan, Nootrop, Nootropil, Normabrain, Norzetam, Pirroxil, Psycoton

Banned

Click to expand

Definition: Stimulant

Information:

It is used following surgery or trauma, and in a variety of disorders such as alcoholism, vertigo, senile dementia, cerebrovascular accidents, and behavioural disorders in children.
Pirbuterol

Exirel, Maxair, Maxair Autohaler, Spirolair, Zeisin

Conditionally Permitted

Click to expand

Definition: Bronchodilator

Information:

Pirbuterol may be used in the treatment of respiratory diseases.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Piretanide

Arelix, Diumax, Tauliz

Banned

Click to expand

Definition: Diuretic

Information:

It is used for the treatment of hypertension.
Piroxicam

Antiflog, Artroxicam, Baxo, Dexicam, Doblexan, Felden, Feldene, Flogobene, Improntal, Lampoflex, Larapam, Nirox, Novo-Pirocam, Piroftal, Polipirox, Reudene, Roxene, Roxiden, Sasulen, Vitaxicam, Zacam

Conditionally Permitted

Click to expand

Definition: Non-steroidal anti-inflammatory

Information:

Piroxicam acid may be used to relieve pain and inflammation and treat certain cancers.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Pirprofen

Rangasil, Rengasi, Rengasil

Banned

Click to expand

Definition: Non-steroidal anti-inflammatory drug

Information:

It is used for the treatment of rheumatic disorders.
Pitcher Plant extract

Sarapin

Conditionally Permitted

Click to expand

Definition: Analgesic

Information:

Pitcher plant extract may be used to relieve pain.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Pizotifen

Mosegor, Sandomigran, Sandomigrin, Sanmigran

Banned

Click to expand

Definition: Antimigraine

Information:

It is used for the prophylaxis of vascular headaches, including migraine.
Polythiazide

Drenusil, Minizide, Nephril, Polypress, Renese

Banned

Click to expand

Definition: Diuretic

Information:

It is used for the treatment of oedema and hypertension.
Potassium Bromide

Dibro-Be mono, Epilease, Bromapex, Epibrom

Conditionally Permitted

Click to expand

Definition: Inorganic compound

Information:

Potassium Bromide may be used in the treatment of colic, as an anti-convulsant and have sedative effects.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Practolol

Dalzic, Eraldin, Eraldina, Teranol

Banned

Click to expand

Definition: Beta blocker

Information:

It is used for emergency treatment of cardiac arrhythmias.
Pramoxine

Anugesic

Conditionally Permitted

Click to expand

Definition: Local anaesthetic

Information:

Pramoxine is used for the temporary local relief of pain.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Prasterone

Intrarosa

Banned

Click to expand

Definition: Anabolic

Information:

An anabolic steroid used to treat aderenal insufficiency, hormone therapy and reproductive tract diseases. It has no legitimate therapeutic indication in the equine athlete.
Prazepam

Demetrin, Lysaxia, Prazene

Banned

Click to expand

Definition: Anxiolytic

Information:

Prazepam is a benzodiazepine derivative used for the relief of anxiety in humans.
Prazosin

Hypovase

Conditionally Permitted

Click to expand

Definition: Antihypertensive

Information:

Prazosin may be used in the treatment of hypertension and heart disease.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Prednisolone

Codelcortone, Deltacortril, Dhasolone, Pred Forte, Prednisol, Predsolone, Prelone, Solone

Conditionally Permitted

Click to expand

Definition: Corticosteroid

Information:

Prednisolone is used for the treatment of auto-immune disorders, and as an inflammatory and immunosuppressive medication.

Prednisolone is a Threshold Substance.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Prednisone

Deltisone, Hostacortin, Meticorten, Predni Tablinen, Sone, Sterapred, Ultracortene

Conditionally Permitted

Click to expand

Definition: Corticosteroid

Information:

Prednisone is used for the treatment of auto-immune disorders, and as an inflammatory and immunosuppressive medication.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Pregabalin

Alzain, Axalid, Lecaent, Lyrica

Conditionally Permitted

Click to expand

Definition: Anti-convulsant

Information:

Pregabalin may be used in the treatment of epilepsy and pain.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Prenylamine

Segontin

Banned

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Definition: Vasodilator

Information:

Prenylamine has been used for the treatment of angina in humans. It depletes myocardial catecholamine stores, and acts as a calcium channel blocker.
Pridinol

Lyseen, Nonplesin, ParKS

Banned

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Definition: Muscle relaxant

Information:

Pridinol is a centrally acting muscle relaxant used for the symptomatic relief of muscle spasms in humans.
Prifinium Bromide

Padrin, Riabal

Conditionally Permitted

Click to expand

Definition: Anti-spasmodic

Information:

Prifinium bromide may be used to relieve pain and spasms.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Prilocaine

Citanest, Citocaina, Pristesin F, Xylonest, Xylonest-Octapressin

Conditionally Permitted

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Definition: Local anaesthetic

Information:

Prilocaine is used for the temporary local relief of pain.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Primidone

Mylepsinum, Mysoline

Banned

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Definition: Anticonvulsant

Information:

Primidone is an anti-epileptic drug, which is also used in humans for the control of essential tremors. Phenobarbitone is one of its metabolites.
Probenecid

Benemid, Benemide, Benuryl, Probecid, Pro-Cid, Solpurin, Urocid

Banned

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Definition: Diuretic

Information:

Probenecid is used for the prevention of gout in humans; it aids in the elimination of uric acid in the urine. It has also been used to inhibit the excretion of some antibiotics (including penicillin) in the urine, thereby increasing their concentration in the blood. It has been used as a 'masking agent'.
Procainamide

Pronestyl, Procan, Procanbid

Conditionally Permitted

Click to expand

Definition: Anti-arrhythmic

Information:

Procainamide may be used in the treatment of heart rhythm abnormalities.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Procaine

Depocillin, Duphapen, Neopen

Conditionally Permitted

Click to expand

Definition: Local anaesthetic

Information:

Procaine is found in combination with penicillin as procaine penicillin.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Procarbazine

Matulane, Natulan

Banned

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Definition: Chemotherapy

Information:

Procarbazine is an antineoplastic drug most frequently used in human patients for the treatment of Hodgkin's disease.
Procaterol

Meptin

Banned

Click to expand

Definition: Beta adrenergic receptor agonist

Information:

Procaterol is a beta-2 adrenergic agonist used as a short acting bronchodilator in humans for the treatment of a number of respiratory conditions, including asthma.
Prochlorperazine

Stemetil

Banned

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Definition: Antipsychotic

Information:

Prochlorperazine is a group 3 phenothiazine antipsychotic agent. It is also used in humans for the treatment of nausea and vomiting. It is given orally and intramuscularly. Its adverse effects include extrapyramidal symptoms.
Procyclidine

Arpicolin, Kemadrin

Banned

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Definition: Anticholinergic

Information:

Procyclidine is an antimuscarinic drug used in humans for the treatment of drug-induced Parkinson's disease, and drug-induced extrapyramidal symptoms.
Proglumide

Milid

Banned

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Definition: Cholecystokinin antagonist

Information:

Proglumide is a cholecystokinin antagonist which reduces gastrointestinal motility and gastric secretion. There are also reports that it enhances the analgesic effects of opioid agents, and impedes the development of tolerance to them.
Proguanil

Paludrine

Banned

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Definition: Antimalarial

Information:

Proguanil is used for the chemoprophylaxis of malaria, occasionally in combination with other agents.
Prolintane

Promotil, Katovit N

Banned

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Definition: Stimulant

Information:

Prolintane is a sympathomimetic amine with amphetamine like properties, which has been used in humans as a stimulant. It has been used illegally as a recreational drug.
Promazine

Liranol, Prazine, Protactyl, Sparine, Talofen

Conditionally Permitted

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Definition: Sedative

Information:

Promazine may be used as a sedative and anaesthetic premedication.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Promethazine

Phenergan, Fargan, Romergan, Promethagan

Banned

Click to expand

Definition: Antihistamine

Information:

Promethazine is an antihistamine used for the treatment of allergic conditions including hay fever, urticaria and anaphylaxis in humans. Its use may be associated with sedative effects, and it is occasionally used for the treatment of insomnia. Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Pronethalol

Alderlin, Nethalide

Banned

Click to expand

Definition: Anti-arrhythmic

Information:

Pronethalol is a beta blocking agent. It is not used in human medicine due to concerns regarding carcinogenic effects in laboratory animals.
Propafenone

Arythmol, Rythmol

Banned

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Definition: Anti-arrhythmic

Information:

Propafenone is used in man for the prophylaxis and treatment of some cardiac diseases, including, for example, ventricular arrhythmias, and some supra-ventricular arrhythmias.
Propallylonal

Quietal

Banned

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Definition: Sedative

Information:

Propallylonal is one of the older barbiturate sedative agents that is little used now, although there are reports that it is still in use as a sleeping aid in some countries.
Propanidid

Epontol

Banned

Click to expand

Definition: Anaesthetic

Information:

Propanadid is a short acting, intravenous anaesthetic agent used in humans for both the induction of anaesthesia, and for short term anaesthesia. It was withdrawn from the market due to concerns about anaphylactic reactions, although these may have been caused by the vehicle in which it was prepared, rather than by the agent itself. It does not appear to be much in use currently.
Propantheline (Propanthelline)

Corrigast, Ercorax, Ercoril, Ercotina, Pantheline, Pro-Banthine, Propantel

Conditionally Permitted

Click to expand

Definition: Anticholinergic

Information:

Propantheline (Propanthelline) may be used in muscle spasms of the digestive tract.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Propanthelline (Propantheline)

Corrigast, Ercorax, Ercoril, Ercotina, Pantheline, Pro-Banthine, Propantel

Conditionally Permitted

Click to expand

Definition: Anticholinergic

Information:

Propanthelline (Propantheline) may be used in muscle spasms of the digestive tract.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Proparacaine (Proxymetacaine)

See Proxymetacaine

Banned

Click to expand

Definition: Local anaesthetic

Information:

Proparacaine is an alternative name for the local anaesthetic Proxymetacaine (see entry under that name).
Propentofylline

Vivitonin

Conditionally Permitted

Click to expand

Definition: Bronchodilator

Information:

Propentofylline may be used in the treatment of respiratory diseases.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Propiomazine

Largon

Banned

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Definition: Tranquiliser

Information:

Propiomazine is a phenothiazine sedative with antihistamine actions. It is used to induce drowsiness, and to relieve anxiety prior to general anaesthesia.
Propionylpromazine

Banned

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Definition: Tranquiliser

Information:

Propionylpromazine is a phenothiazine sedative. It has reportedly been used illicitly to alter performance in racehorses. It was withdrawn from equine use in the USA due to cases of irreversible penile paralysis in stallions.
Propiram

Dirame

Banned

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Definition: Opiod receptor agonist

Information:

Propiram is an apparently non-addictive opioid analgesic which has received attention for the control of moderate to severe pain in humans.
Propofol

Rapinovet, PropoFlo

Conditionally Permitted

Click to expand

Definition: Anaesthetic

Information:

Propofol may be used for sedation or to induce anaesthesia.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Propoxycaine

Pravocaine, Ranocaine

Banned

Click to expand

Definition: Local anaesthetic

Information:

It is used for infiltration anaesthesia and nerve block in dental procedures.
Propoxyphene

Capadex, Darvon, Darvocet-N, Di-Antalvic, Di-Gesic, Lentogesic

Banned

Click to expand

Definition: Opiod analgesic

Information:

It is used for the treatment of pain, and as an antitussive and local anaesthetic.
Propranolol

Inderal, Avlocardyl, Deralin

Conditionally Permitted

Click to expand

Definition: Beta blocker

Information:

Propranolol may be used in the treatment of abnormal heart rhythms.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Propylhexedrine

Benzedrex, Eggobesin, Eventin, Eventine

Banned

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Definition: Stimulant

Information:

Propylhexedrine is a sympathomimetic and central nervous system stimulant. It is used as a nasal decongestant (by inhalation), and has been used as an appetite suppressant.
Propyphenazone

Saridon

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

It has analgesic and antipyretic effects, similar to those of Phenazone.
Proquazone

Biarison

Banned

Click to expand

Definition: Non-steroidal anti-inflammatory drug

Information:

It is used for the treatment of rheumatic diseases and pain states.
Prostanozol

Prostanozol

Banned

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Definition: Anabolic

Information:

Prostanozol is an anabolic steroid detected in some types of nutritional supplements produced for human use. Although they have been used with bone fide medical intent in horses, anabolic steroids have also been used illicitly in equine sports to attempt to improve performance, mainly due to their effect of promoting muscular development. The use of anabolic steroids long term, or at high doses, carries significant risks.
Prothipendyl

Tolnate

Banned

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Definition: Antipsychotic

Information:

Prothipendyl is an azo-phenothiazine with sedative, anti-emetic and antihistamine effects. It was investigated in the 1960s as an agent for the sedation of elderly patients with mental disease.
Protokylol

Asmetil, Beres, Caytine, Palison, Ventaire

Banned

Click to expand

Definition: Sympathomimetic

Information:

It is used as a beta adrenergic bronchodilator.
Protriptyline

Triptil, Vivactil

Banned

Click to expand

Definition: Stimulant antidepressant

Information:

Protriptyline is a tricyclic antidepressant agent used in humans for the treatment of depression, and a number of other psychological disorders, including narcolepsy, and obstructive sleep apnoea.
Proxibarbital

Ipronal

Banned

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Definition: Sedative

Information:

Proxibarbital is a barbiturate derivative with sedative, hypnotic and anticonvulsive properties. It has been used in the treatment of migraine in humans.
Proxymetacaine (Proparacaine)

Minims Proxymetacaine, Alcaine

Banned

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Definition: Local anaesthetic

Information:

Proxymetacaine (Proparacaine) hydrochloride is a local anaesthetic agent used as eye drops for ocular anaesthesia in humans.
Proxyphylline

Brontyl, Monophyllin, Monophylline, Neofyllin, Proxy-Retardoral, Purofilina, Purophyllin, Sanwaphyllin, Sigophyl, Spantin, Spasmolysin, Thean, Theoden

Banned

Click to expand

Definition: Bronchodilator

Information:

Proxyphylline is a methylxanthine agent used in humans for the relief and prophylaxis of bronchoconstriction in asthma. It has also been shown to increase coronary blood flow.
Pseudoephedrine

Sudafed, Galpseud

Banned

Click to expand

Definition: Stimulant

Information:

Pseudoephedrine is a systemic (oral) nasal decongestant used symptomatically in humans. It is available in proprietary preparations.
Psilocin

Banned

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Definition: Psychedelic

Information:

Psilocin is a psychedelic principle that occurs in a number of species of hallucinogenic mushrooms.
Pyridostigmine

Mestinon, Regonol

Banned

Click to expand

Definition: Anticholinesterase

Information:

Pyridostigmine is an anticholinesterase, and it therefore enhances neuromuscular transmission. It is used in humans for the treatment of myasthenia gravis, for which it has a longer action duration than neostigmine. It also increases intestinal motility.
Pyrilamine (Mepyramine)

Albatussin, Anthisan

Conditionally Permitted

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Definition: Antihistamine

Information:

Pyrilamine (Mepyramine) may be used in the control of allergies.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Pyrimethamine

Daraprim, Erbaprelina, Pirimecidan, Tindurin

Conditionally Permitted

Click to expand

Definition: Anti-parasitic

Information:

Pyrimethamine may be used in the treatment of parasitic disease such as malaria and toxoplasmosis.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Pyrithyldione

Persedon

Banned

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Definition: Sedative

Information:

Pyrithyldione is a sedative hypnotic agent which was widely withdrawn from use in humans due to its association with the development of agranulocytosis.
Pyrrobutamine

Banned

Click to expand

Definition: Antihistamine

Information:

This is a substance deemed to have no legitimate use in equine medicine. Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Quetiapine

Seroquel

Banned

Click to expand

Definition: Dopamine agonist

Information:

Human anti-psychotic drug with high potential for abuse. Used in humans as an anti-depressant and to treat schizophrenia and bipolar disorder.
Quinalbarbital (Secobarbitone)

Barbosec, Bipanal, Bipinal, Evronal, Evrronal, Hypotrol, Hyptran, Imesonal, Immenox, Meballymal, Meballymalum, Novosecobarb, Quinalspan, Sebar, Secobarbital, Sedutain, Seotal, Sodium Seconal, Somosal, Synate, Trisomnin

Banned

Click to expand

Definition: Sedative

Information:

Quinalbarbital (Secobarbitone) is a hypnotic barbituric acid derivative used (in combination with cinchocaine) as an agent for chemical euthanasia in horses, cattle, dogs and cats. It has a rapid onset of action and depresses the central nervous system, including the respiratory centres.
Quinbolone

Anabolicum Vister

Banned

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Definition: Anabolic

Information:

Quinbolone is an anabolic steroid. It has little anabolic effect in itself, but is metabolised into the far more potent Boldenone by the removal of a cyclopentenyl ether group. Although they have been used with bone fide medical intent in horses, anabolic steroids have also been used illicitly in equine sports to attempt to improve performance, mainly due to their effect of promoting muscular development. The use of anabolic steroids long term, or at high doses, carries significant risks.
Quinethazone

Aquamox, Hydromox, Idrokin

Conditionally Permitted

Click to expand

Definition: Diuretic

Information:

Quinethazone may be used in the control of hypotension and oedema

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Quinidine

Biquin, Chinidin, Kiditard, Kinichron, Kinidin, Kinidin Durules, Kinidine, Longachin, Longacor, Quinaglute, Quinalan, Quinidine, Quinobarb, Solfachinid, Systodin

Conditionally Permitted

Click to expand

Definition: Anti-arrhythmic

Information:

Quinidine may be used in the treatment of heart rhythm abnormalities.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Quinine

Adaquin, Bi-Chinine, Biquinate, Chinine, Kinin, Legatrin, Myoquin, Quinamm, Quinate, Quinbisul, Quindan, Quinine, Quinoctal, Quinsul, Quiphile

Conditionally Permitted

Click to expand

Definition: Anti-parasitic

Information:

Quinine may be used in the treatment of malaria and babesiosis.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Quinisocaine

Isochinol, Dimethisoquin, Haenal, Histaderme, Prulantex, Pruralgan, Pruralgin, Quinoleine, Quotane

Banned

Click to expand

Definition: Topical anaesthetic

Information:

Quinisocaine, or dimethisoquin, is a local anaesthetic agent which has been used in humans in topical form as an antipruritic agent.
Ractopamine

Paylean

Banned

Click to expand

Definition: Beta agonist

Information:

Ractopamine is a beta adrenoceptor agonist which has recently been shown to improve growth performance and carcase composition in pigs.
RAD140

Banned

Click to expand

Definition: Anabolic

Information:

An investigational selective androgen receptor modulator (SARM) used for treatment of muscle wasting with no legitimate therapeutic indication in the equine athlete.
Raloxifene

Evista

Banned

Click to expand

Definition: Oestrogen receptor modulator

Information:

Raloxifene is a selective oestrogen receptor modulator (SERM) is used in women for the treatment and prevention of postmenopausal osteoporosis.
Ramifenazone (Isopyrin)

Delta-Tomanol, Tomanol

Banned

Click to expand

Definition: Pain relief

Information:

Used as an anti-inflammatory and painkiller. Not commercially available in the USA or EU. Not approved for use in veterinary medicine.
Rauwolfia

Banned

Click to expand

Definition: Tranquiliser

Information:

The plant contains reserpine and has no legitimate use in the competition horse.
Remifentanil

Ultiva

Banned

Click to expand

Definition: Opiod analgesic

Information:

Remifentanil is an opioid analgesic used in humans for analgesia during general anaesthesia, and in ventilated intensive care patients. In humans, its action duration is short.
Reproterol

Bronchodil, Bronchospasmin, Broncospasmin, Epiferol, Gensasmol, Reprol, Sanasma, Teofluid

Banned

Click to expand

Definition: Bronchodilator

Information:

Reproterol is a selective beta-2 sympathetic agonist. It has been used as a bronchodilator in human asthmatic patients.
Reserpine

Novoreserpine, Serpasil

Banned

Click to expand

Definition: Tranquiliser

Information:

Reserpine is an alkaloid used for long term sedation in horses. A number of side effects have been reported, including hypotension, reduced heart rate, increased gastrointestinal motility, and diarrhoea.
Rimiterol

Puilmodil

Banned

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Definition: Bronchodilator

Information:

Rimiterol is a selective beta-2 sympathomimetic agonist, which has been shown to be an effective bronchodilator in human patients with asthma.
Risedronate

Actonel, Atelvia, Benet

Banned

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Definition: Bone metabolism agent

Information:

A bisphosphonate drug used to strengthen bone, treat osteoporosis and Pagets disease. It is considered a risk to equine welfare and has no legitimate therapeutic indication in the equine athlete
Risperidone

Risperdal

Banned

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Definition: Antipsychotic

Information:

Risperidone may be categorised as an 'atypical antipsychotic drug'. It is one of a number of agents suggested as being better tolerated in humans, and less likely than other antipsychotic drugs, to carry the risk of the development of extrapyramidal symptoms. It is used for the treatment of acute and chronic psychoses.
Ritodrine

Yutopar

Banned

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Definition: Tocolytic

Information:

Ritodrine is a beta-2 agonist used in human medicine as a tocolytic, i.e. to postpone premature labour, with the aim of reducing the risk of harm to the unborn child.
Rofecoxib

Ceoxx, Ceeoxx, Vioxx

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

Rofecoxib is a non-steroidal anti-inflammatory drug (NSAID) that was withdrawn from the human market in 2004, due to fears about an increased risk of heart disease and stroke associated with high dose, long term use.
Romifidine

Sedivet Solution I.V.

Conditionally Permitted

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Definition: Sedative

Information:

Romifidine (Sedivet) is permitted to be administered at a maximum dosage of 5mg 30 minutes (if using 10mg/ml concentration of Romifidine the allowable dose is 0.5ml; if using other concentrations of compounded Romifidine consult with a veterinarian for appropriate dosing) prior to competition but must be submitted on the medications report form. Failure to do so will be considered a violation. (Exception: European region does not allow the use of Romifidine).

Romifidine may be used as a sedative, an anaesthetic premedication and for analgesia.

The detection time is estimated to be 60 hours (2.5 days) after intra-venous administration.

Please remember: A detection time is not the same as a withdrawal time. The detection time is the approximate period of time for which a substance (or its metabolite) remains in a horse's system such that it can be detected by the laboratory. The withdrawal time for a substance adds a safety margin, chosen with professional judgment and discretion to allow for individual differences between horses such as size, metabolism, degree of fitness, recent illness or disease etc. You are advised to seek suitable advice from your treating veterinarian.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Ropivacaine

Naropin

Banned

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Definition: Local anaesthetic

Information:

Ropivicaine is a local anaesthetic used in humans in a wide range of applications, including epidural anaesthesia and nerve blocking. It is an isomer of bupivicaine, with a lower cardiotoxic potential.
Roxadustat

Banned

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Definition: Hypoxia Inducible Factor Activator

Information:

A drug which increases endogenous production of erythropoetin. It has no legitimate therapeutic indication in the equine athlete.
S4

Banned

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Definition: Anabolic

Information:

A selective androgen receptor modulator (SARM) with anabolic activity and also known as Andarine. It has no legitimate therapeutic indication in the equine athlete.
Salbutamol (Albuterol)

Ventolin, Proventil, Torpex, Volmax, Ventipulmin

Conditionally Permitted

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Definition: Bronchodilator

Information:

Salbutamol (albuterol) may be used in the treatment of respiratory disease. The detection time is estimated with 96 hours (4 days) after inhalational administration.

A detection time is not the same as a withdrawal time. The detection time is the approximate period of time for which a substance (or its metabolite) remains in a horse's system such that it can be detected by the laboratory. The withdrawal time for a substance adds a safety margin, chosen with professional judgment and discretion to allow for individual differences between horses such as size, metabolism, degree of fitness, recent illness or disease etc.. You are advised to seek suitable advice from your treating veterinarian.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Salicylamide

BC Powder

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

Salicylamide is an analgesic and antipyretic agent, most commonly associated with the relief of headache in humans.
Salicylic acid

Aspirin, Clearasil Medicated Astringent, Compound-W, Cornina, Coroplast, Egocappol, Fomac, Gehwol, Guttaplast, Gyan, Hydrisalic, Ionil Plus, Keralyt, Occlusal, Phytodermine, Salac, Salicyl, Saligel, SaSha, Sebcur, Subucare, Soluver, Squamasol, Verrugon

Conditionally Permitted

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Definition: Non-steroidal anti-inflammatory

Information:

Salicylic acid may be used to relieve pain, inflammation and control fever.

Salicylic acid is a Threshold Substance.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Salmeterol

Aerometrol, Arial, Astmerole, Fujimycin, Salmetedur, Serevent

Conditionally Permitted

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Definition: Bronchodilator

Information:

Salmeterol may be used in the treatment of respiratory diseases.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Scopolamine (Hyoscine)

Transderm-scop, Scopoderm

Conditionally Permitted

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Definition: Anticholinergic

Information:

Scopolamine (hyoscine) may be used in the treatment of gastrointestinal tract spams such as colic.

Scopolamine (Hyoscine) is a Specified Substance. Specified Substances should not in any way be considered less important or less dangerous than other Prohibited Substances. Rather, they are simply substances which are more likely to have been ingested by Horses for a purpose other than the enhancement of sport performance, for example, through a contaminated food substance.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Secobarbitone (Quinalbarbital)

Barbosec, Bipanal, Bipinal, Evronal, Evrronal, Hypotrol, Hyptran, Imesonal, Immenox, Meballymal, Meballymalum, Novosecobarb, Quinalspan, Sebar, Secobarbital, Sedutain, Seotal, Sodium Seconal, Somosal, Synate, Trisomnin

Banned

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Definition: Sedative

Information:

Secobarbitone (Quinalbarbital) is a hypnotic barbituric acid derivative used (in combination with cinchocaine) as an agent for chemical euthanasia in horses, cattle, dogs and cats. It has a rapid onset of action and depresses the central nervous system, including the respiratory centres.
Selegiline

Eldepryl, Zelapar

Banned

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Definition: Stimulant

Information:

Selegiline is a monoamine oxidase-B inhibitor used in humans for the management of Parkinson's disease.
Sertraline

Lustral

Banned

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Definition: Antidepressant

Information:

Sertraline is a selective serotonin re-uptake inhibitor (SSRI). It is used in humans for the treatment of depressive illness, obsessive-compulsive disorder, and post-traumatic stress disorder in women.
Sibutramine

Reductil

Banned

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Definition: Stimulant

Information:

Sibutramine is a centrally acting appetite suppressant, and it is used in man as an adjunct to the treatment of obesity.
Sildenafil

Viagra, Revatio

Banned

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Definition: Vasodilator

Information:

Sildenafil is a phosphodiesterase type-5 inhibitor used in humans for the treatment of erectile dysfunction, and some forms of pulmonary hypertension.
Sotalol

Beta-Cardone, Sotacor

Conditionally Permitted

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Definition: Beta blocker

Information:

Sotalol may be used in the treatment of abnormal heart rhythms.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Sparteine

Depasan, Spartopan

Banned

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Definition: Anti-arrhythmic

Information:

Sparteine is a Specified Substance. It is an anti-arrhythmic alkaloid which also stimulates uterine contractions. It can be extracted from some species of broom (e.g. Cytisus scoparius) and lupin (e.g. Lupinus luteus). It is not used therapeutically in horses.
Spironolactone

Aldactone, Spiractin

Banned

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Definition: Diuretic

Information:

Spironolactone potentiates the effects of thiazide and loop diuretics by acting as an aldosterone antagonist; it is a potassium-sparing diuretic. It is used in humans for the treatment of ascites and oedema in liver cirrhosis, for nephrotic syndrome, and for congestive heart failure.
Stanozolol

Winstrol, Sungate, Stargate

Banned

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Definition: Anabolic

Information:

Stanozolol is an anabolic steroid. Although they have been used with bone fide medical intent in horses, anabolic steroids have also been used illicitly in equine sports to attempt to improve performance, mainly due to their effect of promoting muscular development. The use of anabolic steroids long term, or at high doses carries significant risks.
Stenbolone

Anatrofin

Banned

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Definition: Anabolic

Information:

Stenbolone is an anabolic steroid. Although they have been used with bone fide medical intent in horses, anabolic steroids have also been used illicitly in equine sports to attempt to improve performance, mainly due to their effect of promoting muscular development. The use of anabolic steroids long term, or at high doses carries significant risks.
Strychnine

Boomer-Rid, Certox, Estricnina, Gopher Bait, Gopher-Gitter, Hare-Rid, Kwik-Kil, Mole Death, Mouse-Nots, Mouse-Rid, Mouse-Tox, Pied Piper Mouse Seed, Ro-Dex, Sanaseed, Strychnos

Banned

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Definition: Muscular convulsions

Information:

Strychnine is a naturally occurring alkaloid derived from the tree Strychnos nux vomica. It is highly poisonous, but has nevertheless been used in the past as a stimulant.
Styramate

Linaxar, Sinaxar

Banned

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Definition: Anticonvulsant

Information:

Styramate is a non-sedative skeletal muscle relaxant.
Sufentanil

Sufenta

Banned

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Definition: Opiod analgesic

Information:

Sufentanil is a synthetic opioid analgesic agent with sedative properties used in general anaesthesia in humans.
Sulfasalazine

Conditionally Permitted

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Definition: Disease-Modifying Anti-Rheumatic Drug (DARD)

Information:

Sulfasalazine may be used in the treatment of gastrointestinal disease.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Sulforidazine

Imagotan, Inofal

Banned

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Definition: Antipsychotic

Information:

Sulforidazine is an antipsychotic agent. A metabolite of thioridazine, itself a phenothiazine antipsychotic agent, sulforidazine shows greater potency than its parent drug.
Sulindac

Clinoril

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

Sulindac is a non-steroidal anti-inflammatory drug (NSAID) used in humans for the treatment of pain and inflammation associated with musculoskeletal disorders, and acute gout.
Sulpiride

Dolmatil, Sulpor

Banned

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Definition: Antipsychotic

Information:

Sulpiride is an antipsychotic agent used in humans for the treatment of schizophrenia, and occasionally to treat Tourette syndrome.
Sumatriptan

Imigran

Banned

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Definition: Serotonin agonist - migraine treatment

Information:

Sumatriptan is a serotonin agonist used for the treatment of acute migraine and (when given by subcutaneous injection) cluster headache in humans.
Suprofen

Maldocil, Masterfen, Procofen, Profenal, Srendam, Sulproltin, Suprocil, Suprol, Sutoprofen

Conditionally Permitted

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Definition: Non-steroidal anti-inflammatory

Information:

Suprofen may be used to relieve pain, inflammation and control fever.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Suxibuzone

Danilon

Conditionally Permitted

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Definition: Non-steroidal anti-inflammatory

Information:

Suxibuzone may be used to relieve pain, inflammation and control fever. It is a pro-drug of phenylbutazone, a Controlled Medication.

The detection times should follow the same indications as phenylbutazone.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Synephrine

Chibro, Sympatol, Uvicol

Banned

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Definition: Stimulant

Information:

Synephrine has been used as an aid to weight loss in humans, although there is some controversy as to its efficacy, and there are reports of some serious adverse reactions. It is obtained from citrus trees, in particular the bitter orange, Citrus Aurantium. Synephrine is a Specified Substance. Specified Substances should not in any way be considered less important or less dangerous than other Prohibited Substances. Rather, they are simply substances which are more likely to have been ingested by Horses for a purpose other than the enhancement of sport performance, for example, through a contaminated food substance.
Tamoxifen

Nolvadex

Banned

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Definition: Oestrogen receptor modulator

Information:

Tamoxifen is an oestrogen receptor antagonist used in the treatment of breast cancer in women. It has also been used in the management of breast pain, and some forms of infertility.
Temazepam

Euhypnos, Normison, Temtabs

Banned

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Definition: Tranquiliser

Information:

Temazepam is an anxiolytic benzodiazepine sedative. It has been used in humans as a pre-medicant before surgery, as an anxiolytic prior to investigative procedures, and for the treatment of insomnia.
Tenoxicam

Mobiflex, Tilcotil

Banned

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Definition: Pain relief

Information:

Tenoxicam is a non-steroidal anti-inflammatory drug (NSAID) used in humans for the treatment of pain and inflammation associated with musculoskeletal disorders. Its action is of long duration, and can be given on a once daily basis.
Tepoxalin

Zubrin

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

Tepoxalin is a non-steroidal anti-inflammatory drug (NSAID) used in dogs for the treatment of acute and chronic musculoskeletal conditions. It is effective against both cyclooxygenase and lipoxygenase inflammatory pathways.
Terazocin (Terazosin)

Hytrin

Banned

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Definition: Alpha adrenergic blocker

Information:

Terazocin is an alpha-adrenoceptor blocking agent that is used in humans for the treatment of mild to moderate hypertension, as well as for the symptomatic relief of benign prostatic hyperplasia.
Terazosin (Terazocin)

Hytrin

Banned

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Definition: Alpha adrenergic blocker

Information:

Terazocin is an alpha-adrenoceptor blocking agent that is used in humans for the treatment of mild to moderate hypertension, as well as for the symptomatic relief of benign prostatic hyperplasia.
Terbutaline

Bricanyl, Brethine

Conditionally Permitted

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Definition: Bronchodilator

Information:

Terbutaline may be used in the treatment of respiratory diseases.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Terfenadine

Seldane, Teldane, Triludan

Banned

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Definition: Antihistamine

Information:

Terfenadine is an antihistamine formerly used for the treatment of allergies in man. Due to concerns about adverse effects, it has been superceded by other antihistamines. Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Testolactone

Teslac

Banned

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Definition: Aromatase inhibitor

Information:

Testolactone is an antineoplastic agent. A progesterone derivative, it acts by inhibiting the enzyme steroid aromatase, and thereby reduces endogenous oestrogen production. It is used in the treatment of some forms of breast cancer in women.
Testosterone

Andriol, Androderm, Androgel, Androtardyl, Intrinsa, Striant, Testogel, Testopatch, Testoviron

Banned

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Definition: Anabolic

Information:

Testosterone is a naturally occurring steroid hormone produced primarily in the testes (and, to a lesser degree, the ovaries). It is important in the development of the male reproductive organs, male secondary sexual characteristics and male behaviour. It has anabolic effects.
Tetracaine

Ametop, Minims Amethocaine Hydrochloride

Conditionally Permitted

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Definition: Local anaesthetic

Information:

Tetracaine is used for the temporary local relief of pain.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Tetrahydrogestrinone (THG)

Banned

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Definition: Anabolic

Information:

Tetrahydrogestrinone (THG) is an anabolic steroid used illicitly to improve performance in elite human sports. Although they have been used with bone fide medical intent in horses, anabolic steroids have also been used illicitly in equine sports to attempt to improve performance, mainly due to their effect of promoting muscular development. The use of anabolic steroids long term, or at high doses, carries significant risks.
Thebaine

Banned

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Definition: Opiod alkaloid

Information:

Thebaine, also known as paramorphine, is an opiate alkaloid similar in structure to morphine, but with stimulatory rather than depressive properties. It is not used therapeutically.

Thebaine is a Specified Substance. Specified Substances should not in any way be considered less important or less dangerous than other Prohibited Substances. Rather, they are simply substances which are more likely to have been ingested by Horses for a purpose other than the enhancement of sport performance, for example, through a contaminated food substance.
Thenoic acid

Thioveol

Conditionally Permitted

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Definition: D-amino acid oxidase inhibitor

Information:

Thenoic acid may be used in the treatment of respiratory disease.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Theobromine

Theosalvose

Conditionally Permitted

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Definition: Stimulant

Information:

Theobromine may be used to stimulate the central nervous system and cardiac muscle.

Theobromine is a Specified Substance. Specified Substances should not in any way be considered less important or less dangerous than other Prohibited Substances. Rather, they are simply substances which are more likely to have been ingested by Horses for a purpose other than the enhancement of sport performance, for example, through a contaminated food substance.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Theophylline

Elixophyllin, Novo-Theophyl, Nuelin, Quibron-T, Retafyllin, Theo-Dur, Theolair, Theolin, Uniphyl, Uniphyllin, Xanthium, Xantivent

Conditionally Permitted

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Definition: Bronchodilator

Information:

Theophylline may be used in the treatment of respiratory disease.

Theophylline is a Specified Substance. Specified Substances should not in any way be considered less important or less dangerous than other Prohibited Substances. Rather, they are simply substances which are more likely to have been ingested by Horses for a purpose other than the enhancement of sport performance, for example, through a contaminated food substance.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
THG (Tetrahydrogestrinone)

Banned

Click to expand

Definition: Anabolic

Information:

THG (Tetrahydrogestrinone) is an anabolic steroid used illicitly to improve performance in elite human sports. Although they have been used with bone fide medical intent in horses, anabolic steroids have also been used illicitly in equine sports to attempt to improve performance, mainly due to their effect of promoting muscular development. The use of anabolic steroids long term, or at high doses, carries significant risks.
Thiethylperazine

Torecan

Banned

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Definition: Anti-emetic

Information:

Thiethylperazine is a phenothiazine anti-emetic agent used to control nausea and vomiting associated with cancer chemotherapy.
Thiopropazate

Dartalan

Banned

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Definition: Antipsychotic

Information:

Thiopropazate is a phenothiazine derivative used as an antipsychotic agent in humans.
Thioproperazine

Cephalmin, Majeptyl, Mazeptyl, Megeptil, Sulfenazin, Vontil

Banned

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Definition: Cataleptic

Information:

Thioproperazine is a phenothiazine antipsychotic agent used in humans for the control of schizophrenia.
Thioridazine

Mallorol, Mellaril-S, Melleril, Melleretten, Novoridazine, Ridazine, Thioril

Banned

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Definition: Antipsychotic

Information:

Thioridazine is a phenothiazine antipsychotic agent used in man for the treatment of schizophrenia. Due to concerns about severe adverse effects, it is used far less today than previously.
Thiothixene

Navane

Banned

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Definition: Antipsychotic

Information:

Thiothixene is a thioxanthene antipsychotic agent used in humans for the treatment of schizophrenia, and other psychotic disorders.
Thonzylamine

Neohetramine, Tonamil

Banned

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Definition: Antihistamine

Information:

It is used as an antipruritic. Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Thozalinone

Stimsen

Banned

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Definition: Psychoactive

Information:

Thozalinone is a psychostimulant with effects somewhat similar to those of Amphetamine.
Thymosin (synthetic fragments)

TB500

Banned

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Definition: Anabolic

Information:

Thymosins are small proteins with anti-inflammatory and anabolic effects.
Tiaprofenic Acid

Surgam, Surgamyl, Tiaprofen

Banned

Click to expand

Definition: Non-steroidal anti-inflammatory drug

Information:

Tiaprofenic acid is a non-steroidal anti-inflammatory drug (NSAID). A propionic acid derivative, it is used in humans for the control of pain and inflammation in musculoskeletal disorders. It is sometimes associated with the development of severe cystitis in human patients.
Tibolone

Livial

Banned

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Definition: Anabolic

Information:

Tibolone is used for hormone replacement therapy in women. It has both oestrogenic and progestogenic activity, and is used for the treatment of oestrogen deficiency, and occasionally for osteoporosis prophylaxis.
Tildronate

Tildren

Conditionally Permitted

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Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Tiletamine

Telazol

Conditionally Permitted

Click to expand

Definition: Anaesthetic

Information:

Tiletamine is a general anaesthetic agent resulting in sedation, immobility, amnesia and analgesia.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Tilidin

Valoron

Banned

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Definition: Opioid

Information:

Tilidin can be used to treat pain however the substance has no legitimate therapeutic use in the sports horse
Tiludronate disodium

Tildren bisphosphonate

Conditionally Permitted

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Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Tiludronic Acid

Tildren, Skelid

Conditionally Permitted

Click to expand

Definition: Bisphosphonate

Information:

Tiludronic acid may be used in the treatment of orthopaedic disease.

The detection time is estimated with 672 hours (28 days) after oral administration.

A detection time is not the same as a withdrawal time. The detection time is the approximate period of time for which a substance (or its metabolite) remains in a horses system such that it can be detected by the laboratory. The withdrawal time for a substance adds a safety margin, chosen with professional judgment and discretion to allow for individual differences between horses such as size, metabolism, degree of fitness, recent illness or disease etc.. You are advised to seek suitable advice from your treating veterinarian.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Timolol

Blocadren, Timoptol

Conditionally Permitted

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Definition: Beta blocker

Information:

Timolol may be used in the treatment of ocular diseases.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Tiotropium

Spiriva

Conditionally Permitted

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Definition: Bronchodilator

Information:

Tiotropium may be used in the treatment of respiratory diseases.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Tocainide

Tonocard

Banned

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Definition: Local anaesthetic

Information:

Tocainide is a Class 1b anti-arrhythmic agent used to treat some cardiac arrhythmias in humans and dogs. It has not been evaluated for use in horses.
Tofenacin

Elamol, Tofacine

Banned

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Definition: Antidepressant

Information:

Tofenacin is a metabolite of orphenadrine and, similarly, is an anticholinergic agent.
Tolfenamic Acid

Clotam Rapid

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

Tolfenamic acid is a non-steroidal anti-inflammatory drug, licensed in the UK specifically for the treatment of acute migraine attacks in humans.
Tolmetin

Tolectin

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

Tolmetin is a non-steroidal anti-inflammatory drug (NSAID) that is used in humans for the treatment of musculoskeletal disorders.
Tolvaptan

Samsca, Jinarc

Banned

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Definition: Vaptans

Information:

A drug which eliminates water from the body without electrolyte loss and is used in the treatment of heart failure. It has no legitimate therapeutic indication in the equine athlete.
Tolycaine

Banned

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Definition: Local anaesthetic

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Torasemide

Torem, Demadex

Banned

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Definition: Diuretic

Information:

Torasemide is a loop diuretic (similar to frusemide) inhibiting reabsorption of salt from the ascending limb of the Loop of Henle in the renal nephron. It is used in humans for the treatment of oedema, especially pulmonary oedema, and hypertension.
Toremifene

Fareston

Banned

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Definition: Oestrogen receptor modulator

Information:

Toremifene is licensed for the treatment of some forms of metastatic breast cancer in postmenopausal women, although it is only infrequently used in the UK.
Tramadol

Zamadol, Zydol, Ryzolt, Ultram, Tramal

Banned

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Definition: Analgesic

Information:

Tramadol is an opioid analgesic used in humans for the control of moderate to severe pain. It is less effective than some of the other opioids for pain relief, but has relatively fewer side effects. Repeated administration of opioids can cause dependence and tolerance.
Tramazoline

Biciron, Ellatun, Rhinaspray, Rinogutt, Spray-Tish

Banned

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Definition: Sympathomimetic

Information:

Tramazoline is a sympathomimetic vasoconstrictor agent that has been used as a nasal decongestant in man.
Tranexamic Acid

Amcacid, Amchafibrin, Amstat, Anvitoff, Carxamin, Ciclokapron, Emorhalt, Exacyl, Frenolyse, Hexapromin, Hexatron, Tranex, Tranexan, Transamin, Transamlon, Ugurol

Conditionally Permitted

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Definition: Anti-fibrinolytic

Information:

Tranexamic acid may be used in the treatment and prevention of bleeding disorders.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Tranylcypromine

Parnate, Jatrosom

Banned

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Definition: Mono-amine oxidase inhibitor

Information:

Tranylcypromine is a monoamine-oxidase inhibitor (MAOI) used in humans for the treatment of depressive illness. It is considered to be the most hazardous of the MOAI agents.
Trazodone

Beneficat, Desyrel, Molipaxin

Banned

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Definition: Antidepressant

Information:

Trazodone is a tricyclic antidepressant agent with sedative properties, which is used in man for the treatment of depressive conditions where sedation is required, and is also used in the treatment of anxiety.
Trena

Banned

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Definition: Anabolic

Information:

Trena, also known as trenbolone, is an anabolic steroid which has been used as a growth promoter in animals. Although used with bone fide medical intent in horses, anabolic steroids have also been used illicitly in equine sports to attempt to improve performance, mainly due to their effect of promoting muscular development. The use of anabolic steroids long term, or at high doses, carries significant risks.
Trenbolone

Finaplix

Banned

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Definition: Anabolic

Information:

Trenbolone is an anabolic steroid which has been used as a growth promoter in animals. Although used with bone fide medical intent in horses, anabolic steroids have also been used illicitly in equine sports to attempt to improve performance, mainly due to their effect of promoting muscular development. The use of anabolic steroids long term, or at high doses, carries significant risks.
Trestolone

Banned

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Definition: Anabolic

Information:

An experimental anabolic steroid with no legitimate therapeutic indication in the equine athlete.
Triamcinolone

Aristocort, Cinolone, Delphi, Ipercortis, Kenacort, Kenalog, Ledercort, Triamcet, Volon

Conditionally Permitted

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Definition: Corticosteroid

Information:

Triamcinolone is used to treat a wide number of inflammatory diseases.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Triamcinolone Acetonide

Vetalog, Adcortyl

Conditionally Permitted

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Definition: Corticosteroid

Information:

Triamcinolone acetonide is an anti-inflammatory agent, used in the treatment of orthopaedic disease e.g. osteoarthritis.

The detection time is estimated to be 168 hours (7 days) after intra-articular administration.

Please remember: A detection time is not the same as a withdrawal time. The detection time is the approximate period of time for which a substance (or its metabolite) remains in a horse's system such that it can be detected by the laboratory. The withdrawal time for a substance adds a safety margin, chosen with professional judgment and discretion to allow for individual differences between horses such as size, metabolism, degree of fitness, recent illness or disease etc. You are advised to seek suitable advice from your treating veterinarian.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Triamcinolone Hexacetonide

Aristospan

Conditionally Permitted

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Definition: Corticosteroid

Information:

Triamcinolone hexacetonide is used in the treatment of inflammatory disease.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Triamterene

Dyrenium, Dytac

Banned

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Definition: Diuretic

Information:

Triamterene is a potassium sparing diuretic used in man for the treatment of hypertension as well as oedema caused by a variety of factors, including heart failure and liver disease.
Triazolam

Apo-Triazo, Halcion, Hypam, Trilam

Banned

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Definition: Anxiolytic

Information:

Triazolam is a benzodiazepine agent used to promote sleep in insomnia sufferers.
Trichlormethiazide (formerly in Naquasome)

Achletin, Anatran, Anistadin, Aponorin, Carvacron, Chlopolidine, Cretonin, Esmarin, Fluitran, Flutra, Intromene, Kubacron, Metahydrin, Naqua, Schebitran, Tachionin, Tolcasone, Triflumen

Conditionally Permitted

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Definition: Diuretic

Information:

Trichlormethiazide may be used in the control of hypotension and oedema.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Triflumeprazine

Stelazine

Banned

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Definition: Phenothiazene

Information:

This is a substance deemed to have no legitimate use in equine medicine.
Trifluoperazine

Eskazinyl, Eskazine, Jatroneural, Modalina, Stelazine, Terfluzine, Trifluoperaz

Banned

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Definition: Antipsychotic

Information:

Trifluoperazine is used in humans as a class 3 phenothiazine antipsychotic agent. It is also used for the treatment of severe nausea and vomiting. Its use in humans is associated with a relatively high incidence of extrapyramidal symptoms.
Trifluoromethylphenyl piperazine

Legal X

Banned

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Definition: Psychoactive

Information:

Trifluoromethylphenylpiperazine (TFMPP) is a psychoactive drug with no apparent medical applications. It has been abused as a recreational drug by humans.
Trifluperidol

Psicoperidol, Triperidol

Banned

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Definition: Antipsychotic

Information:

Trifluperidol, a butyrophenone derivative, is an antipsychotic agent that has been used in humans.
Triflupromazine (Floupromazine)

Psyquil, Siquil, Vesprin

Banned

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Definition: Antipsychotic

Information:

It is used for the management of psychosis, and the control of nausea and vomiting.
Trihexylphenidyl (Trihexyphenidyl)

Broflex, Benzhexol

Banned

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Definition: Acetylcholine inhibitor

Information:

Trihexylphenidyl (Trihexyphenidyl) (also known as Benzhexol) is an antimuscarinic (anticholinergic) agent used in humans for the treatment of drug induced parkinsonism (which may be associated with the use of some antipsychotic drugs), and drug induced extrapyramidal symptoms. It is also occasionally used in the treatment of some movement disorders.
Trihexyphenidyl (Trihexylphenidyl)

Broflex, Benzhexol

Banned

Click to expand

Definition: Acetylcholine inhibitor

Information:

Trihexyphenidyl (Trihexylphenidyl) (also known as Benzhexol) is an antimuscarinic (anticholinergic) agent used in humans for the treatment of drug induced parkinsonism (which may be associated with the use of some antipsychotic drugs), and drug induced extrapyramidal symptoms. It is also occasionally used in the treatment of some movement disorders.
Trimecaine

Trimecaine HCL

Banned

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Definition: Local anaesthetic

Information:

Trimecaine is a local anaesthetic and anti-arrhythmic agent, which has been used in human medicine.
Trimeprazine

Panectyl, Repeltin, Vallergan

Banned

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Definition: Antipruritic

Information:

Trimeprazine, also known as alimemazine, is an antihistamine with sedative effects, used in humans for the treatment of pruritus (for example in eczema) and urticaria. It is generally formulated as the tartrate salt.
Trimetazidine

Vastarel

Banned

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Definition: Angina treatment

Information:

Trimetazidine is an agent which alters cardiac muscle cell metabolism and has been used as a treatment for angina in humans.
Trimipramine

Surmontil, Stangyl

Banned

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Definition: Antidepressant

Information:

Trimipramine is a tricyclic antidepressant agent used in humans for the treatment of depressive illnesses, especially when a sedative therapeutic effect is required.
Tripamide

Normonal

Banned

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Definition: Antihypertensive

Information:

Tripamide is a diuretic agent that has been used for the treatment of hypertension in humans.
Tripelennamine

Azaron, PBZ, Pyribenzamine

Conditionally Permitted

Click to expand

Definition: Antihistamine

Information:

Tripelennamine may be used in the control of allergies.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Triprolidine

Actifed, Sudafed

Banned

Click to expand

Definition: Antihistamine

Information:

Triprolidine is an antihistamine with mild sedating properties. It is used for the treatment of respiratory allergies in humans, and is often combined with other agents in proprietary preparations for the symptomatic treatment of mild respiratory infections. Note: With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.
Trometamol

Addex-THAM, Alcaphor, Basionic, Tham, Thamacetat, Thamesol, Trisaminol

Conditionally Permitted

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Definition: Organic Compound

Information:

Trometamol may be used in the treatment of metabolic acidosis.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Tropicamide

Conditionally Permitted

Click to expand

Definition: Anticholinergic

Information:

Tropicamide may be used to dilate the pupils during ocular examinations.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Tuaminoheptane

Armeen L-7, Heptamine, Heptedrine, Heptin, Rinofluimucil, Rinoflumil, Rineptil, Rineptyl, Tuamine

Banned

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Definition: Stimulant

Information:

Tuaminoheptane is a sympathomimetic vasoconstrictor agent that has been used as a nasal decongestant in man.
Tulobuterol

Hokunalin

Banned

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Definition: Bronchodilator

Information:

Tulobuterol is a selective beta-2 adrenergic agonist used as a bronchodilator in humans, most frequently for the treatment of asthma. In addition to the inhalation route, it is also available as a transdermal preparation.
Tybamate

Solacen

Banned

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Definition: Anxiolytic

Information:

Tybamate is an anxiolytic drug. It is a prodrug for meprobamate, which is being withdrawn from the UK market as it is less effective than the benzodiazepine anxiolytics, but more hazardous and capable of inducing dependence.
Valdecoxib

Bextra

Banned

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Definition: Pain relief

Information:

Valdecoxib is a non-steroidal anti-inflammatory drug (NSAID) that was used in humans for the treatment of conditions such as osteoarthritis and rheumatoid arthritis. It has been withdrawn due to concerns about its adverse effects.
Valerenic acid

Valerenic acid

Conditionally Permitted

Click to expand

Definition: Sedative

Information:

Valerenic acid is a constituent of the essential oil of the valerian plant. It may be used as a mild sedative in horses and found in herbal preparations.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Valnoctamide

Axiquel, Nirvanil

Banned

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Definition: Sedative

Information:

Valnoctamide is a sedative-hypnotic agent that has been investigated for its use in the control of epilepsy in humans.
Valproate

Epilim, Orlept, Depacon, Depakene

Banned

Click to expand

Definition: Anticonvulsant

Information:

Valproate, usually used in the sodium salt form, is used in humans for the treatment of all forms of epilepsy as well as in treatment for migraine prophylaxis. Valproic acid is also used for the treatment of epilepsy.
Vanillyl Butyl Ether

Black Horse Warming Liniment

Banned

Click to expand

Definition: Chemical compound

Information:

Vanillyl Butyl Ether may be used as a warming agent.
Vardenafil

Levitra, Vivanza

Banned

Click to expand

Definition: Vasodilator

Information:

Vardenafil is a phosphodiesterase type-5 inhibitor licensed for the treatment of erectile dysfunction in humans.
Vedaprofen

Quadrisol

Conditionally Permitted

Click to expand

Definition: Non-steroidal anti-inflammatory

Information:

Vedoprofen may be used to relieve pain and inflammation.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Velagliflozin

Senvelgo

Conditionally Permitted

Click to expand

Definition: Anti-hyperglycaemic

Information:

Velagliflozin may be used in the treatment of equine metabolic syndrome.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Venlafaxine

Efexor

Banned

Click to expand

Definition: Antidepressant

Information:

Venlafaxine is an antidepressant agent, categorised as a serotonin and noradrenaline re-uptake inhibitor (SNRI). In humans it is used to treat major depression and generalised anxiety disorder.
Venom - naturally derived and synthetic

Banned

Click to expand

Definition: Muscarinic

Information:

The toxin of the rattlesnake, Crotalus horridus, is used as a homeopathic agent to attempt to control exercise induced pulmonary haemorrhage.
Verapamil

Cordilox, Zolvera, Verelan, Calan

Banned

Click to expand

Definition: Anti-arrhythmic

Information:

Verapamil is a calcium channel blocker used in humans for the treatment of angina, hypertension and some cardiac arrhythmias. It reduces heart rate, and force of contraction, and therefore lowers cardiac output.
Vilanterol

Anoro Ellipta, Revinty Ellipta, Relvar Ellipta

Conditionally Permitted

Click to expand

Definition: Bronchodilator

Information:

Vilanterol may be used in the treatment of respiratory diseases.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Viloxazine

Vivalan, Emovit

Banned

Click to expand

Definition: Antidepressant

Information:

Viloxazine, a morpholine derivative, is a bicyclic antidepressant agent that has been used for the treatment of depression in humans.
Warfarin

Aldocumar, Athrombin, Coumadin, Coumadine, Marevan, Panwarfin, Sofarin, Waran, Warfarin, Warfilone

Banned

Click to expand

Definition: Anticoagulant

Information:

Warfarin is an anticoagulant agent that antagonises the effects of vitamin K. It is used in humans for the treatment of a number of conditions, for example, deep vein thrombosis. It was in vogue some time ago for the treatment of navicular disease in horses.
Xipamide

Diurexan, Aquaphor

Banned

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Definition: Diuretic

Information:

Xipamide is a 'thiazide-like' diuretic agent therefore increases urine output. It is used in humans for the treatment of oedema and hypertension.
Xylazine

Anased, Rompun, Sedaxylan, Sedazine, Xylamax, Xylazine

Conditionally Permitted

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Definition: Sedative

Information:

Xylazine may be used as a sedative and analgesic.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Xylometazoline

Otrivine

Banned

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Definition: Adrenergic

Information:

Xylomethazoline is a sympathomimetic agent used in man for the treatment of nasal congestion. It acts by constricting blood vessels in the nasal mucosa thereby reducing oedema.
YK-11

Banned

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Definition: Anabolic

Information:

A selective androgen receptor modulator (SARM) with anabolic activity. It has no legitimate therapeutic indication in the equine athlete
Yohimbine

Yocon, Yocoral, Yohimbine, Yohimex

Conditionally Permitted

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Definition: Stimulant

Information:

Yohimbine may be used to reverse sedation.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Zeranol

Ralgro

Banned

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Definition: Oestrogen agonist

Information:

Zeranol is a non-steroidal oestrogenic growth promoter that has been used to improve weight gain in cattle.
Ziconotide (Zicotinide)

Prialt, SNX111

Banned

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Definition: Opiod analgesic

Information:

Ziconotide controls chronic and severe pain in humans. It is used as a therapeutic alternative for patients who are intolerant or refractory to other conventional treatments.
Zicotinide (Ziconotide)

Prialt, SNX111

Banned

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Definition: Opiod analgesic

Information:

Zicotinide controls chronic and severe pain in humans. It is used as a therapeutic alternative for patients who are intolerant or refractory to other conventional treatments.
Zilpaterol

Banned

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Definition: Beta agonist/repartitioning agent

Information:

Zilpaterol is a beta adrenergic agonist that has been used as a performance enhancer for beef cattle.
Zimeldine

Normud, Zelmid

Banned

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Definition: Antidepressant

Information:

Zimeldine is a serotonin uptake inhibitor that was formerly used for the treatment of depression in humans, but was withdrawn some years ago due to the risk of adverse effects associated with its use.
Zolazepam

Telazol

Conditionally Permitted

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Definition: Sedative

Information:

Zolazepam is used as a sedative in general anaesthesia.

With all medications, a clinical judgment is essential to ensure that the welfare of the horse is never compromised by administering a drug at a time too close to an event such that it may mask symptoms and could aggravate a clinical condition. Horses with locomotor problems in particular must always be provided with adequate rest.

Horses may not exhibit at an NRHA approved event if they have received any medication classified as a conditionally permitted substance unless they have filed the appropriate Medication Report, to be competition eligible horses must meet all requirements in the current NRHA Handbook under section 8, and in a timely-submitted official Medications Report Form. Please note: Timely filing of the Medications Report Form does not guarantee responsible parties of their responsibility to adhere to NRHA Medication rules.

Conditionally permitted substances require a 24-hour withdrawal prior to the horse competing.
Zoledronate

Banned

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Definition: Bone metabolism agent

Information:

A bisphosphonate drug used for the treatment of osteoporosis, fractures and hypercalcaemia associated with cancer and Pagets disease. It is considered a risk to equine welfare and has no legitimate therapeutic indication in the equine athlete
Zolpidem

Stilnoct, Hypnogen, Ambien

Banned

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Definition: Hypnotic

Information:

Zolpidem is a non-benzodiazepine hypnotic agent that acts on the benzodiazepine receptor with a short duration of action. It is used for the short term treatment of insomnia in man. There is evidence that drug dependence occurs in a small number of patients.
Zomepirac

Zomax

Banned

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Definition: Non-steroidal anti-inflammatory drug

Information:

Zomepirac is a non-steroidal anti-inflammatory drug (NSAID) which was withdrawn from the human market in the early 1980s, due to an association with anaphylactic responses.
Zopiclone

Vivalan, Emovit

Banned

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Definition: Hypnotic

Information:

Zopiclone is a non-benzodiazepine hypnotic agent which acts on the benzodiazepine receptor with an action of short duration. It is used for the short term treatment of insomnia in humans. There is evidence that drug dependency occurs in a small number of patients.
Zuclopenthixol

Clopixol, Cisordinol

Banned

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Definition: Antipsychotic

Information:

Zuclopenthixol is an antipsychotic neuroleptic agent used in humans for the treatment of schizophrenia. It is a dopamine D1 and D2 receptor antagonist, and has weak antihistamine effects. It is available in short and long acting formulations.
Δ1-Testosterone

Banned

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Definition: Anabolic

Information:

A synthetic anabolic steroid with no legitimate therapeutic indication in the equine athlete.