Omeprazole’s pharmacologic action is a proton pump inhibitor, which can inhibit the secretion of gastric acid, but does not have the effect of direct treatment of gastric flatulence. Omeprazole has the effect of inhibiting gastric acid secretion and inhibiting pepsin. Clinically used in the treatment of stress ulcers, reflux esophagitis gastric ulcers, duodenal ulcers, and Zhuo – Ai syndrome (gastrinoma) and so on. Abdominal pain and diarrhea, headache and insomnia, nausea, rash, dizziness, drowsiness, gastrointestinal flatulence and constipation may occur during the use of omeprazole. It is contraindicated in those who are allergic to the product, those with severe renal insufficiency and infants. Omeprazole is a prescription drug, should be used under the guidance of a doctor, not to buy and use on their own, so as not to delay the condition of the wrong medicine.