Famotidine is used to treat gastroesophageal reflux disease (acid reflux), peptic ulcer disease, and heartburn.
How Famotidine Works Famotidine is a histamine H2 receptor antagonist. It functions by decreasing the amount of acid produced in the stomach, which helps alleviate acid-related indigestion and heartburn.
Common side effects of Famotidine include headache, diarrhea, drowsiness, and constipation.