Ranitidine can play a role in the treatment of gastrointestinal bleeding, gastric mucosal damage and other diseases. It has the effect of inhibiting gastric acid secretion as well as protecting gastric mucosa. Efficacy: Ranitidine can treat peptic ulcer bleeding, diffuse gastric mucosal lesion bleeding, anastomotic ulcer bleeding, gastric surgery to prevent re-bleeding; acute gastric mucosal damage and aspirin-induced acute gastric mucosal damage complicated by stress; prevent the occurrence of stress ulcer hemorrhage under the stress of severe diseases (such as cerebral hemorrhage, severe trauma, etc.). Role: Ranitidine belongs to the acid inhibitor, for suffering from gastrointestinal diseases triggered by excessive gastric acid secretion, can play a role in inhibiting gastric acid secretion, protect the gastric mucosa. However, ranitidine has some common adverse reactions such as nausea, rash, constipation, fatigue, headache, dizziness, etc., a small number of patients after taking the drug caused mild hepatic impairment, after stopping the drug can be restored to normal. Allergic to the product is prohibited. It is recommended that patients read the instructions before using the drug, and if symptoms occur during the use of the drug, promptly inform the doctor for examination and treatment.