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Famotidine is a medicine that reduces the amount of acid the stomach makes. It belongs to a group of medicines called histamine-2 blockers. Prescription forms treat conditions such as ulcers and gastroesophageal reflux disease, while nonprescription forms treat or prevent certain types of heartburn.
read more about famotidine ...Prescription famotidine treats stomach or small intestine ulcers and gastroesophageal reflux disease. It can also treat conditions that cause the stomach to produce too much acid. Nonprescription famotidine treats or prevents heartburn linked to acid indigestion or sour stomach.
Famotidine blocks histamine-2 receptors in the stomach. This reduces acid production and gives irritated tissue a chance to heal. It does not work in the same way as an antacid, which neutralizes acid already in the stomach.
Famotidine is available in prescription and nonprescription forms taken by mouth. The dose and schedule depend on the condition being treated and the product used. A clinician may adjust the dose for someone with kidney problems.
Headache, dizziness, constipation, and diarrhea can occur. Tell a clinician about kidney disease and other medicines before taking famotidine. Seek medical help for signs of a serious allergic reaction, such as swelling or difficulty breathing.
Yes. Certain famotidine products are sold without a prescription for acid indigestion and heartburn. Follow the directions on the specific product.
Nonprescription famotidine can be taken before foods or drinks that trigger heartburn. Check the package for the recommended timing and dose.
No. Famotidine reduces acid production, while antacids neutralize acid already present in the stomach.
They may. A clinician can assess kidney function and determine an appropriate dose.
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Famotidine. StatPearls (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK534778/. Date Accessed October 6, 2026.
Famotidine (oral route) - Side effects & dosage. Mayo Clinic. https://www.mayoclinic.org/drugs-supplements/famotidine-oral-route/description/drg-20072972. Date Accessed October 6, 2026.
FAMOTIDINE tablet, film coated. DailyMed (National Library of Medicine). https://dailymed.nlm.nih.gov/dailymed/lookup.cfm?setid=f175822d-7ca4-fa33-e053-2995a90ac310. Date Accessed October 6, 2026.
H2 blockers. MedlinePlus. https://www.medlineplus.gov/ency/patientinstructions/000382.htm. Date Accessed October 6, 2026.