Gastric mucosal protectants are medications that can help repair the gastric mucosa and also enhance the gastric mucosal barrier, commonly used medications include aluminum thioglycollate, bismuth potassium citrate and so on. Gastric mucosal protectants are often used in the treatment of stomach-related diseases, such as chronic gastritis, gastric ulcer, etc., mainly due to excessive secretion of gastric acid, which causes irritation to the gastric mucosa, thus causing gastric mucosal damage. In this case, gastric mucosal protectants such as aluminum sulfate and bismuth potassium citrate can be taken to promote the growth of mucosal epithelium and relieve the discomfort caused by gastric mucosal damage. Gastric mucosal protective agent may have some adverse reactions, the use of medication under the guidance of a doctor, patients should not self-medication, and often need to be combined with other medications, such as omeprazole, rabeprazole and other acid suppression drugs, conducive to the recovery of the condition.