Merial UlcerGard Oral Paste is an excellent non-prescription preventative for gastric ulcer on horses. This oral paste works by safely reducing acid production in the horse's stomach. This product's active ingredient, omeprazole, has gone through extensive testing for effectiveness and safety. Its recommended to administer during stressful events that can be ulcer-inducing, such as racing, training, traveling, showing, competition and stall confinement. Merial UlcerGard Oral Paste is the only equine stomach ulcer preventative that is FDA approved. Sold in 4-dose syringe.