Gastric mucosal protector is a kind of drug that protects the gastric mucosa, and there are more kinds of them, including bismuth, prostaglandin and its derivatives, aluminum thioglycollate and so on. There is no such thing as which mucosal protector is good in clinical practice, and the choice of gastric mucosal protector is slightly different for different diseases. 1. Bismuth: commonly used drugs are bismuth potassium citrate, colloidal bismuth pectin, etc. These drugs have the characteristics of colloid, which can form high-viscosity sol in the acidic environment, and then have a strong affinity with the ulcer surface as well as the inflammation surface to play a protective role. 2. Prostaglandins and their derivatives: Misoprostol and dinoprostenol are often used in the clinic, these drugs can inhibit the secretion of gastric acid, cause smooth muscle contraction, and reduce the invasion of gastric acid on the gastric mucosa, which in turn plays a role in protecting the gastric mucosa. 3. Aluminum thioglycollate: after taking the drug, it can make the damaged gastric mucous membrane form a protective film on the surface under the acidic environment, so as to resist the attack of gastric acid on the gastric mucous membrane, and promote the healing of the ulcer surface. In the use of gastric mucous membrane protection agent treatment, it is recommended to follow the doctor’s instructions, and in the use of drugs during the treatment of physical symptoms, such as: nausea, vomiting, and so on, it is recommended to consult a doctor in a timely manner.