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UlcerGard works to prevent stomach ulcers in horses. The active ingredient in UlcerGard, omeprazole has been extensively tested for safety and effectiveness. It works by reducing the production of acid in the horse's stomach. To help horses maintain optimal gastric health, it is recommended that UlcerGard be administered during stressful events or activities that may induce stomach ulcers. Such conditions may include: training, racing, showing or stall confinement. 4 dose syringe.