OMI-Z Capsules contain omeprazole, a proton pump inhibitor that reduces stomach acid production. It ...OMI-Z Capsules contain omeprazole, a proton pump inhibitor that reduces stomach acid production. It is used to treat conditions such as acid reflux, peptic ulcers, and gastroesophageal reflux disease (GERD), promoting healing of the stomach and esophagus lining and providing relief from heartburn.See more