Lansoprazole inhibits the secretion of stomach acid and can be used in diseases such as stomach ulcers. It should be used in accordance with medical advice. The commonly used dosage forms of Lansoprazole are tablets, capsules and injections. This product can inhibit the secretion of gastric acid, and can be used for duodenal ulcer, gastric ulcer, reflux esophagitis, anastomotic ulcer, and Drewe-Ai syndrome. Adverse reactions to this product can be seen as allergic reactions, thrombocytopenia, abnormal liver function test values, interstitial pneumonitis, interstitial nephritis, thirst, constipation, diarrhea, abdominal distension, headache or drowsiness. The drug is contraindicated in people who are allergic to the product, or who are taking human immunodeficiency virus protease inhibitors (e.g., nelfinavir, atazanavir). The drug should be used rationally under the supervision of a doctor.