Equine Sports Council

Controlled Medications Library

ESC MEDICATION CLASSIFICATIONClass C1 - Strictly Controlled - PE Medical

ESC Medication Library · Revision 2

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Medication Facts

Performance enhancing
Yes
Total hours to clear
Not recorded
Frequently used
N/A
ESC ID
TROMET-0911
Trade names
Ketoralac, Dinoprost
Drug type
Alkalizing Agent
Plasma half-life · hours
Not Published
Equine dosing
Consult veterinarian
Cmax · peak plasma concentration
Not Published
Tmax · time to peak plasma concentration
Not Published
ESC concentration guidance
Lowest Dectable Level (LDL) 0.05 mg/mL or 50 picograms per mL
Primary withdrawal · hours
48
Washout withdrawal · hours
0
ESC control type
C1 - Strictly Controlled - Restricted - Performance
Medication report required
MED REPORT REQUIRED

Uses & side effects

Alkalizing agent and buffering agent administered as a mix with other medications

Product-specific side effects await source review.

Drug interactions

In horses, trometamol (also known as tromethamine or Tris buffer) is primarily used as an alkalizing agent and acid buffer. It helps neutralize acid buildup, combat dehydration, and prevent conditions like acidosis or "tying-up" (exertional rhabdomyolysis) in heavily sweating or intensely working horses.Trometamol has a few distinct functions in equine care:Acidosis and Tying-Up (Myopathy) Prevention: It acts as an active buffer salt in electrolyte and recovery supplements (e.g., Ranvet Neutrolene Plus) to prevent excessive lactic acid accumulation during rigorous training and high-level exertion.Medication Salt Carrier: Trometamol is frequently used as a pharmaceutical salt combined with other active medications to make them more water-soluble and stable in the horse’s body.Reproductive Management: As dinoprost tromethamine (e.g., Lutalyse), it is utilized by veterinarians to induce uterine contractions, lyse the corpus luteum, terminate pregnancy, and control the timing of estrus (heat cycles) in mares.Pain and Inflammation Research: It is used as a compound base in ketorolac tromethamine (Toradol), which has been investigated as an alternative painkiller for equine lameness and colic, although standard drugs like phenylbutazone or flunixin meglumine are typically preferred.

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. 56

Reviewed 2026-09-23

Not verified for this medication.Not verified for this medication.Not verified for this medication.Drug Class 3 · 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.