Gastrointestinal mucosal protective drugs include colloidal bismuth agents such as colloidal bismuth pectin gel, neutralizing gastric acid drugs such as magnesium aluminum carbonate, and proton pump inhibitors such as omeprazole. 1. Bismuth agent: such as colloidal bismuth pectin, bismuth citrate potassium, etc., under the action of gastric acid can form a layer of bismuth salts and viscous condensate on the inner surface of the stomach, which has a good protective effect on the gastrointestinal mucosa. 2. Mucosal protective agent: such as magnesium aluminum carbonate and other drugs can form a protective layer in the gastric mucosa, neutralize part of the gastric acid and reduce the damage of gastric acid to the gastrointestinal mucosa. 3. Proton pump inhibitors: such as omeprazole, rabeprazole, etc. can effectively inhibit the secretion of gastric acid and pepsin to protect the gastrointestinal mucosa. It should be noted that these drugs should be used under the guidance of a physician after examination and according to the condition.