(Horse Gold) GastroMax3 contains omeprazole, sodium acid carbonate and l-glutamine. These ingredients work in tandem to reduce and neutralize the acid in a horse's stomach. GastroMax3 can prevent, or be used for the care of, gastric stomach ulcers. Each tube contains 4.25 grams total proprietary formula. Independent analysis has measured 2.28 grams omeprazole per tube. Give 1/4 tube daily to horses weighing 600-1200 lbs. For horses over 1200 lbs, give 1/2 tube daily.