Betamethasone,
Betavet
Medication Facts
- Performance enhancing
- Potentially
- Total hours to clear
- 504
- Frequently used
- Most Prescribed
- ESC ID
- BETAME-0118
- Trade names
- Betavet
- Drug type
- Corticosteroid
- Plasma half-life · hours
- 9
- Equine dosing
- 9 mg or 1.5 mL per joint, **Joint Injections** **Due to severe contraindictations consult a licensed veterinarian to discuss treatment options before combining with Betamethasone, Dexamethasone, Methylprednisolne, Isoflupredone, Triamcinolone. If switching between these withdrawals must be at least 7 days,
- Cmax · peak plasma concentration
- 2.70 to 3.97 ng/mL
- Tmax · time to peak plasma concentration
- 4 to 8 hours
- ESC concentration guidance
- 12 HRS WD 6500 pg/mL IA, 6000 pg/mL IM. 72 hrs WD 10 pg/mL IA, 100 pg/mL IM
- Primary withdrawal · hours
- 12
- Washout withdrawal · hours
- 168
- ESC control type
- A1 - Generally Controlled - Therapeutic
- Medication report required
- Generally not required, however understand exceptions.
Uses & side effects
Drug interactions
Because BetaVet contains a highly potent corticosteroid (betamethasone), its rapid systemic absorption following an intra-articular hock injection can cause severe, adverse reactions if combined with specific medications.The primary equine drug interactions for betamethasone are detailed below.1. Non-Steroidal Anti-Inflammatory Drugs (NSAIDs)Examples: Phenylbutazone (Bute), Flunixin meglumine (Banamine), Firocoxib (Equioxx), Ketoprofen.Interaction: Betamethasone and NSAIDs both interfere with the protective prostaglandin pathways that maintain the stomach lining and ensure adequate blood flow to the kidneys.Clinical Impact: High. Concurrent use multiplies the risk of severe gastrointestinal ulceration, right dorsal colitis, and acute kidney injury. Systemic NSAIDs should be withheld for several days following a BetaVet injection.2. Other CorticosteroidsExamples: Dexamethasone, Triamcinolone acetonide (Vetalog), Methylprednisolone acetate (Depo-Medrol).Interaction: Stacking multiple synthetic steroids creates an additive effect that overloads the horse's metabolic and endocrine systems.Clinical Impact: High. This combination massively extends the duration of hypothalamic-pituitary-adrenal (HPA) axis suppression and drastically increases the risk of life-threatening corticosteroid-associated laminitis.3. Macrolide Antibiotics & Azole Antifungals (CYP450 Inhibitors)Examples: Erythromycin, Clarithromycin, Rifampin (often used together for Rhodococcus equi), Ketoconazole.Interaction: Betamethasone is metabolized in the liver by cytochrome P450 enzymes. Macrolides and azoles act as potent inhibitors of these enzymes, shutting down the liver's ability to clear the steroid.Clinical Impact: Moderate to High. Concurrent use slows down systemic clearance, extending the plasma half-life of betamethasone well past its standard 8 hours. This triggers prolonged adrenal suppression and unpredictable drug testing windows.4. Loop DiureticsExamples: Furosemide (Salix/Lasix).Interaction: Corticosteroids promote potassium excretion in the kidneys. Loop diuretics also aggressively flush potassium from the body.Clinical Impact: Moderate. When used together, they can induce severe hypokalemia (dangerously low blood potassium levels), resulting in skeletal muscle weakness and cardiac arrhythmias. This is highly relevant if a racing horse receives race-day furosemide close to a BetaVet treatment window.5. Vaccines and Modified-Live BiologicsInteraction: The rapid initial plasma spike of BetaVet causes a brief but intense suppression of the horse's immune cell response.Clinical Impact: Moderate. Administering routine vaccines (e.g., Tetanus, West Nile, EEE/WEE) within days of a BetaVet injection will blunt the horse's ability to build adequate protective antibodies, rendering the vaccine ineffective.6. Insulin and Metabolic Support MedicationsExamples: Exogenous Insulin, Pergolide mesylate (Prascend).Interaction: Betamethasone directly opposes the actions of insulin, triggering transient insulin resistance, hyperinsulinemia, and hyperglycemia.Clinical Impact: High for Equine Metabolic Syndrome (EMS) or Pituitary Pars Intermedia Dysfunction (PPID/Cushing's) patients. BetaVet will actively counteract these daily medications, spiking insulin levels and immediately threatening to precipitate a laminitic episode.
Contraindications
Betamethasone, Dexamethasone, Methylprednisolne, Isoflupredone, Triamcinolone.