Colloidal bismuth pectin can protect the gastric mucosa. Colloidal bismuth in pectin is a gastric mucosal protection drug, which is mainly used for the treatment of peptic ulcers, especially those associated with Helicobacter pylori infection, as well as for the treatment of chronic superficial and atrophic gastritis. The drug is occasionally associated with GI-related adverse reactions such as nausea and constipation. After using the drug, the feces may appear dark brown, which is a normal reaction and will return to normal after stopping the drug for 1 to 2 days. However, if, after stopping the drug, the color of the stool does not return to normal, seek medical attention. The drug should not be taken for a long time in large doses, can not be taken at the same time with milk, can not be taken at the same time with strong acid-suppressing drugs, otherwise it will reduce the effectiveness of the drug. The drug is contraindicated in pregnant women and people with severe renal insufficiency.