Rezudel refers to bismuth potassium citrate preparation, which is mainly used to treat gastric ulcer, duodenal ulcer, erosive gastritis and so on. Bismuth potassium citrate belongs to gastric mucous membrane protector, which can form a protective layer on the surface of gastric mucous membrane, preventing the attack of gastric acid and pepsin on ulcers, and at the same time reducing the activity of pepsin, which is effective for gastric ulcers, duodenal ulcers, erosive gastritis and other diseases, and can relieve chronic gastritis, stomach pain caused by excessive gastric acid. It is contraindicated for those who are allergic to bismuth potassium citrate, pregnant women, and those with severe renal insufficiency. Adverse reactions such as headache, insomnia, nausea, vomiting, loss of appetite and darkening of stools may occur during the administration of the drug, and it is recommended to use the drug under the guidance of a doctor.