Omeprazole is an acid suppressant belonging to the proton pump inhibitors, mainly for the treatment of diseases caused by excessive secretion of gastric acid. According to the different conditions, the specific dosage of the drug is also different, to 20mg omeprazole enteric-coated capsules, for example, as follows: 1. Peptic ulcer: 20mg once, 1~2 times a day. In the treatment of gastric ulcer, the instruction course is 4~8 weeks, and in the clinic it is generally used 6~8 weeks; in the treatment of duodenal ulcer, the instruction course is 2~4 weeks, and in the clinic it is commonly used 4~6 weeks. 2. Reflux esophagitis: 20~60mg once, 1~2 times a day, the course of treatment is usually 4~8 weeks. 3.Drexler-Ayer’s syndrome: 60mg once a day, once a day, and then the total daily dose can be adjusted to 20-120mg according to the condition; if the total daily dose is more than 80mg, it should be divided into two doses. The drug has mild adverse effects, but long-term use may cause side effects such as bacterial proliferation, hypergastrinemia, and nutrient malabsorption. It should be noted that the drug is contraindicated in people who are allergic to it. The drug should be administered under the supervision of a doctor, and if you feel unwell while taking it, you should stop taking it immediately and seek medical attention.