I. H2 receptor blocking drugs are commonly used acid-suppressing drugs. These drugs bind to H2 receptors on the stomach wall cells, inhibit the bismuth acid effect of histamine-stimulated cells, and reduce the secretion of gastric acid. Commonly used drugs include cimetidine, ranitidine, famotidine, and nizatidine. Adverse effects may include headache, flatulence, diarrhea, nausea, dizziness, etc. H2 receptor blockers are best taken with food. Long-term use is not recommended for elderly patients. 1. Cimetidine (methandiamide, Tagamet). Each tablet dose 0 . 2 g, 0 . 8 grams, capsule dose 0 . 8 grams. Commonly used dose is 0 . 2 grams 4 times a day; or 0.4 grams per time, taken orally, 3 times a day. 2. Ranitidine (furanilamide, metronidazole, gastrodine, Zanogastrin). Each tablet dose 0 . 15 grams. The usual dose is 0.15 grams per time. 15 g orally twice a day. 3.Famotidine (Synfuadin, Gosudal). Dose 10 mg per tablet. The usual dose is 20 mg per time, taken orally twice a day. 4. Nizatidine (Weinin). Dose 0.15 g per tablet. 15 grams. The usual dose is 0.15 grams each time. 15 grams twice a day; or 0.30 grams per time, orally, once a day. 30 g orally, l times a day, orally. Proton pump inhibitors mechanism of action is to specifically block the final link of gastric acid secretion by gastric lining cells and inhibit the activity of H-10-K-10-ATPase. These commonly used drugs are omeprazole, lansoprazole, pantoprazole and rabeprazole. 1, omeprazole (Oxy, Loxac). Each tablet dose of 10 mg, 20 mg, capsule dose of 20 mg. Commonly used dose is 10 – 20 mg per time, oral, 2 times a day. 2. Lansoprava (Daclopromide). Each tablet dose 15 mg, 30 mg, capsule dose of 30 mg. The usual dose is 30 mg per dose, taken orally twice a day. 3. Pantoprazole (Tamanix). Dose of 30 mg per tablet. The usual dose is 30 mg orally twice a day. 4. Rabeprazole (Polite, Repo). The most 10 mg per tablet. The usual dose is 10 mg per tablet, taken orally twice a day.