Famotidine injection dosage is 20mg per time, once every 12 hours, intravenous drip or push, should be used in accordance with medical advice. The instruction of Famotidine injection points out that the dosage of this product is 20mg each time, using 5% dextrose 250ml dilution, intravenous drip, drip time is more than 30 minutes, or add saline 20ml slow intravenous push (time is not less than 3 minutes). Twice daily (12 hours interval). Famotidine injection is used for upper gastrointestinal bleeding caused by peptic ulcer, and for those who bleed from erosions of the gastric and duodenal mucosa caused by various reasons (except tumors, esophageal and fundal varices). Adverse reactions to this product include headache, dizziness, constipation, diarrhea and so on. The drug is contraindicated in people with severe renal insufficiency, those who are allergic to the product, lactating women, pregnant women. The drug should be used rationally under the guidance of a doctor.