Omefast-20 Capsule is used for the short-term treatment of ulcers in the upper part of the small intestine (duodenal ulcer). This medicine helps by reducing the level of acid in the stomach. Omefast is also used for the short-term treatment of stomach ulcer, to treat heartburn and indigestion caused by GERD, for the short-term treatment of inflammation of the food pipe, for the long-term treatment of overproduction of gastric acid (Zollinger-Ellison syndrome),