Hi Emily, first I would talk to your vet and if your horse has been diagnosed with ulcers, he needs treatment as described by your vet. But keeping your horse on a medication like Omeprazole is no longterm solution. It‘s extremly expensive and doesn‘t solve the bigger problem...effectlively maintaining the acid necessary for digestion without causing stomach ulcers.
Hi Emily, gastric ulcers are common in horses. Gastric ulcers are most commonly treated with Gastroguard, a proton pump inhibitor, which is not cheap but is effective. A horse suffering from gastric ulcers will also need their management reviewed in order to reduce the likelihood of the ulcers reoccuring. Susceptible horses should have: plenty of time at pasture, continuous access to forage when stabled, minimal stress, a reduced level of training and reduced levels of grain and concentrates in the diet.