Omeprazole is used for the treatment of gastric ulcers, duodenal ulcers, reflux esophagitis, gastrinoma and other diseases, and can also be used for the eradication of Helicobacter pylori when used in combination with antibiotics. Gastric ulcer is an ulcerative lesion of the mucous membrane inside the stomach. Inhibiting the excessive secretion of gastric acid through omeprazole can promote the repair of ulcers and effectively relieve stomach pain, heartburn and other uncomfortable symptoms. The main cause of duodenal ulcer is the invasive ability of gastric acid and pepsin exceeds the defense of duodenum, resulting in inflammatory damage to the duodenal mucosa, omeprazole inhibits the excessive secretion of gastric acid and can effectively improve the symptoms of abdominal pain and discomfort of duodenal ulcer. Reflux esophagitis can be aggravated by excessive gastric acid, and after acid suppression treatment by omeprazole, the symptoms can be effectively relieved. Gastrinoma, a neuroendocrine tumor of the gastrointestinal tract, can cause large amounts of stomach acid to be secreted, and omeprazole can improve this symptom very well. Omeprazole is a prescription medication and needs to be taken in a targeted manner under the supervision of a doctor. Omeprazole can cause abdominal distension, nausea, transaminase elevation, headache, peripheral neuritis, vitamin B12 deficiency and other adverse reactions, for omeprazole allergy, hepatic and renal insufficiency, infants and young children, pregnant women and lactating women are prohibited to use omeprazole. In the process of using the drug, if there is an adverse reaction, you should immediately consult a doctor, the drug should not be taken on its own.