Famotidine tablets are mainly used for the treatment of esophagitis, gastroduodenal ulcer, reflux esophagitis, acute gastric mucosal lesions and gastrinoma. It is to be taken orally, 20mg twice a day, usually after breakfast, dinner or at bedtime, for a period of 4-6 weeks. After taking this drug, there will be adverse reactions, the more common ones are dry mouth, dizziness, insomnia, constipation, rash, etc. A few of them may appear mild or transient liver damage such as transaminase elevation. It is prohibited to use in patients with allergy or severe liver and kidney insufficiency, pregnant and lactating women, and infants and children should be used with caution.