Increased stomach acid may lead to symptoms such as heartburn, chest pain, abdominal pain, nausea, and vomiting. Drugs that inhibit stomach acid include H2 receptor antagonists and proton pump inhibitors. 1. H2 receptor antagonists: common drugs include ranitidine, omertidine, famotidine and so on. The wall cells of the stomach wall contain H2 receptors, which are regulated by hormones in the body to secrete gastric acid. H2 receptor antagonists can inhibit the function of this receptor and reduce the secretion of gastric acid by the stomach wall. Side effects include nausea and vomiting, dizziness and dry mouth. Use with caution in children and patients with hepatic insufficiency. 2. Proton pump inhibitors: common drugs include omeprazole, lansoprazole, rabeprazole and so on. Proton pump inhibitors are currently inhibiting gastric acid secretion of a stronger class of drugs, common side effects include nausea, flatulence, diarrhea and so on. The drug should be used with caution in patients with liver disease. If patients have symptoms of increased stomach acid, they should go to the hospital in time for treatment, and should take doctor’s advice during the medication.