Cimetidine is an H2 receptor antagonist, which can significantly inhibit the secretion of gastric acid caused by food, histamine or pentagastrin, and reduce its acidity. This product can prevent and protect corrosive gastritis caused by chemical stimulation, and also has obvious curative effect on stress gastric ulcer and upper gastrointestinal bleeding. This product has anti androgen effect and has certain value in the treatment of hirsutism. This product can reduce the activity of immunosuppressive cells and enhance immune response, so as to inhibit tumor metastasis and prolong survival. It is used to treat duodenal ulcer, gastric ulcer and upper gastrointestinal bleeding.