Citric acid can be used in medicine for the treatment of peptic ulcer diseases. Citric acid is a chemical substance that is often used in pharmaceutical additives, such as bismuth potassium citrate, which is mainly made using citric acid. When it enters the digestive system, it protects the gastrointestinal mucosa, helps the recovery of the ulcerated surface of the gastrointestinal mucosa, and reduces the damage to the gastric mucosa caused by gastric acid. Bismuth potassium citrate is often used on the treatment of Helicobacter pylori infection, the use of which requires the combination of antibiotic drugs, citrate but with the drug components into the stomach, can be broken down by the body, nausea, vomiting, acid reflux caused by gastric disorders, has a relieving effect. The use of the process can cause side effects, the use of time should not be too long, itself has a serious kidney disease patients, in order to avoid the impact on the kidneys, should be prohibited.