Side effects of lansoprazole include diarrhea, dry mouth, nausea, and loss of appetite. Lansoprazole is a proton pump inhibitor, can inhibit the proton pump activity and then play a role in inhibiting the secretion of gastric acid, can be used for the treatment of gastric and duodenal ulcers, anastomotic ulcers, reflux esophagitis and other diseases. Lansoprazole allergy, severe renal insufficiency patients are prohibited to use this drug treatment. Side effects of lansoprazole include gastrointestinal symptoms such as dry mouth, nausea, diarrhea, loss of appetite, constipation, neurological and psychiatric symptoms such as dizziness, headache, hematologic symptoms such as leukopenia, anemia, and allergic reactions such as hives and rashes. Patients who need to use lansoprazole for treatment should use the drug under the guidance of a doctor, and it is recommended to go to the hospital if there are uncomfortable symptoms after using the drug.