Omeprazole belongs to acid inhibiting drugs, which can be taken when patients have gastritis, gastric ulcer, gastroenteritis, reflux esophagitis. 1. Gastritis, gastric ulcer: when patients have gastritis and gastric ulcer, the gastric mucous membrane breaks down, and a large amount of gastric acid directly stimulates the stomach wall, resulting in stomach pain, stomach acid and other discomforts, at this time, appropriate use of omeprazole can relieve stomach pain. 2. Gastroenteritis: when patients eat unclean, poorly digested food, resulting in gastrointestinal dysfunction, a large amount of gastric acid secretion, appropriate use of omeprazole can reduce the stimulation of gastric acid on the stomach wall, to alleviate stomach pain and other discomforts. 3. Reflux esophagitis: when the pyloric sphincter relaxes, a large amount of gastric acid refluxes into the esophagus to stimulate the esophagus, there will also be stomach pain and acidity and other discomforts, at this time, you can take omeprazole appropriately. In addition, it is recommended to use medication under the guidance of a doctor, not blindly self-medication, in order to avoid adverse effects.