Dexlansoprazole, the dextral version of Lansoprazole, is an anti-peptic ulcer drug and the second proton pump inhibitor after omeprazole. Dexlansoprazole has the effect of inhibiting gastric acid secretion, which is better than other drugs (omeprazole, Chemicalbook pantoprazole, rabeprazole), and can significantly inhibit the occurrence of ulcer. It is better than famotidine or omeprazole for duodenal ulcer caused by ethanol-induced gastric mucosa injury and acid hypersecretion. In addition, this product also has similar anti-Helicobacter pylori action as bismuth preparation, and is used in reflux esophagitis and Zou-Ai syndrome.