Stomach ulcers in horses are caused by the overproduction of stomach acid; this causes pain and discomfort, damages to the lining of the stomach, poor performance, and even death. Stressful conditions such as travel, showing, training, racing, competition, barn routine changes, and stall confinement can give horses stomach ulcers. GastroGard is the first and only medication approved by the FDA for the treatment of stomach ulcers in horses. The active ingredient in GastroGard, omeprazole, works by blocking the enzymes responsible for the production of stomach acid, resulting in enough acid to breakdown food for digestion but not the excess acid that causes ulcers. By suppressing stomach acid production, GastroGard gives the ulcer time to heal and helps prevent the recurrence of stomach ulcers. GastroGard is available in an easy-to-use oral paste that can be given daily for four weeks.