Horse Gastric Prevention Advanced: Omeprazole Dosing and Duration

Evidence-based omeprazole dosing and treatment duration protocols optimize therapeutic benefit while minimizing rebound acid secretion and resistance development in equine gastric disease.

Key Facts

Treatment dose of omeprazole (4 mg/kg once daily) achieves gastric pH elevation above therapeutic threshold in most horses
Maintenance dose (1 mg/kg) is frequently insufficient for squamous disease control during active work
Treatment duration of 28 days is standard — shorter courses produce incomplete mucosal healing
Omeprazole resistance has not been confirmed in horses, but commercial formulation variation affects bioavailability
Compounded omeprazole shows variable bioavailability — some preparations achieve inadequate gastric pH elevation
Rebound acid hypersecretion following abrupt discontinuation is manageable through gradual dose tapering

Welfare Considerations

Omeprazole welfare use in horses suffers from significant under-dosing and premature discontinuation in clinical practice. Horses treated for insufficient durations or at maintenance doses during active disease fail to achieve mucosal healing, continuing to experience gastric pain despite apparent treatment. The welfare implication is significant — owners believe their horse is being treated effectively while chronic pain continues. Licensed GastroGard at therapeutic dose for full 28-day courses, confirmed effective by re-endoscopy, is the welfare-appropriate protocol. Management changes concurrent with medication are essential — medication alone without management change produces rapid relapse.

What You Can Do

Use licensed omeprazole formulations at therapeutic dose — do not substitute compounded preparations without veterinary guidance
Complete the full 28-day treatment course — premature discontinuation leaves gastric lesions incompletely healed
Implement management changes concurrent with medication — dietary modification prevents relapse
Schedule a re-endoscopy at 28 days to confirm healing before reducing to maintenance or discontinuing