Bismuth-based stomach medicines are usually used before three meals, with the 4th dose taken 2 hours after dinner. Bismuth gastric drugs are mainly used to treat gastritis, peptic ulcer and Helicobacter pylori. Common bismuth gastric drugs include bismuth potassium citrate, bismuth pectin and bismuth aluminate tablets. The use of bismuth gastric drugs needs to follow the instructions of the doctor, usually before three meals as well as the fourth dose 2 hours after dinner, different preparations have different ways of taking. Bismuth gastric drugs must be mixed with other drugs in order to treat the disease well, bismuth gastric drugs are prescription drugs, need to be used under the guidance of a professional doctor, the patient can not use this drug privately, the improper use of the drug is likely to cause osteoarthritis, stomatitis, colitis and other adverse symptoms. Long-term use can cause liver and kidney insufficiency, dry mouth, constipation and other side effects. For pregnant women, children and other patients prohibited. It is recommended to consult a doctor in time, bismuth-based gastric drugs need to be used under the guidance of a doctor.