Equine Sports Council

Controlled Medications Library

ESC MEDICATION CLASSIFICATIONClass A - Therapeutic

ESC Medication Library · Revision 2

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Medication Facts

Performance enhancing
No
Total hours to clear
Not recorded
Frequently used
N/A
ESC ID
CARPRO-0186
Trade names
Rimadyl
Drug type
NSAID
Plasma half-life · hours
Not Published
Equine dosing
1-2 mg/kg PO
Cmax · peak plasma concentration
10 µg/mL
Tmax · time to peak plasma concentration
45
ESC concentration guidance
May not exceed 6% efficacy in plasma
Primary withdrawal · hours
12
Washout withdrawal · hours
0
ESC control type
A1 - Generally Controlled - Therapeutic
Medication report required
Generally not required, however understand exceptions.

Uses & side effects

Product-specific side effects await source review.

Drug interactions

Using more than one NSAID concurrently (e.g., combining phenylbutazone, flunixin meglumine, or firocoxib) drastically increases risks of toxicity without increasing pain relief.Corticosteroids (e.g., Dexamethasone): Combining NSAIDs with steroids increases the likelihood of gastric ulcers and severe GI toxicity.Nephrotoxic Agents: Avoid combining NSAIDs with aminoglycoside antibiotics (e.g., gentamicin) or diuretics, as this significantly increases the risk of acute renal failure.Blood Thinners: Concomitant use with anticoagulants (e.g., heparin) increases the risk of bleeding complications.Dehydration/Pre-existing Disease: NSAIDs are more toxic when horses are dehydrated, septic, or have pre-existing kidney or hepatic disease

Contraindications

Sanctioning-body comparison

Plasma only. Compare published competition guidance for this medication. ESC guidance remains in Medication Facts above. A dosing guideline, withdrawal recommendation and laboratory detection threshold are different measures.

Sources reviewed September 23, 2026. “Not verified” means a gap in this comparison, not zero tolerance or permission. Doses describe the cited rules; your veterinarian must determine treatment and withdrawal.

Published guidance by organization
OrganizationPublished dose & routePlasma concentrationWithdrawal / timingControl / penalty class
AQHA Show HorsesShow rules · 2026 handbook
Conditions & sources

An unverified entry is not permission to use this medication. Consult the linked current rules.

Reviewed 2026-09-23

Not verified for this medication.Not verified for this medication.Not verified for this medication.Medication-specific control not yet verified.
APHA Paint Show HorsesShow rules · 2026 Rule Book
Conditions & sources

An unverified entry is not permission to use this medication. Consult the linked current rules.

Reviewed 2026-09-23

Not verified for this medication.Not verified for this medication.Not verified for this medication.Medication-specific control not yet verified.
ARCI Model RulesRacing model · Rules 15 / UCG 20.0 / CTMS 4.2.1
Conditions & sources

An unverified entry is not permission to use this medication. Consult the linked current rules. ARCI model comparison only; no state-specific rule is substituted. Schedule timing is tied to its stated regimen and is not a clearance guarantee.

UCG 20.0 PDF p. 19

Reviewed 2026-09-23

Not verified for this medication.Not verified for this medication.Not verified for this medication.Drug Class 4 · Penalty Class B. No dosing permission is implied by classification.
USEFNational Therapeutic Substance Provisions · 2026 + July amendment
Conditions & sources

An unverified entry is not permission to use this medication. Consult the linked current rules.

Reviewed 2026-09-23

Not verified for this medication.Not verified for this medication.Not verified for this medication.Medication-specific control not yet verified.