Drugs for treating duodenal ulcer include drugs that inhibit gastric acid secretion, such as omeprazole, lansoprazole and rabeprazole. There are also mucosal protective agents, including bismuth potassium citrate and compound bismuth aluminate. And prostaglandin and its derivatives, such as misoprostol, aluminum sulfate, aluminum hydroxide, etc. Finally, there are drugs to eradicate Helicobacter pylori, such as amoxicillin and clarithromycin.