Not to eat omeprazole can be replaced by ranitidine, but need to be taken under the guidance of a specialist. 1. Omeprazole: Omeprazole is a kind of drug for treating gastric diseases, is a proton pump preparation, has the effect of inhibiting the secretion of gastric acid, can effectively reduce the secretion of gastric acid, and help the repair of gastric acid mucosa. The more common adverse reactions of omeprazole are diarrhea, nausea, stomach pain, constipation and flatulence, etc. It is forbidden for those who are allergic to omeprazole and those with severe renal insufficiency. 2. Ranitidine: Ranitidine is a kind of treatment for gastric ulcer, reflux esophagitis, duodenal ulcer and high gastric acid secretion disease. The main adverse effects of Ranitidine include nausea, fatigue, headache and dizziness, etc. It is contraindicated for those who are allergic to Ranitidine. In addition, there are certain risks associated with the use of the above drugs, and patients need to be guided by a specialist.