What it is used for
- Heartburn and indigestion
- Acid reflux (GERD)
- Stomach and duodenal ulcers
- Preventing heartburn from certain foods or drinks
How it works
Famotidine blocks the histamine (H2) signal that prompts the stomach to release acid, lowering acid levels and relieving heartburn and reflux.
How it is taken
Comes as tablets, chewable tablets, oral suspension, and an injectable form. It is taken by mouth, and some forms can be taken before situations likely to trigger heartburn. Take it exactly as your doctor, pharmacist, or the label directs.
No doses here on purpose. The right strength and schedule depend on you — only a doctor or pharmacist should set them. Always follow your prescription and the label.
Common side effects
- Headache
- Dizziness
- Constipation or diarrhea
- Tiredness
Serious effects — get help
- Severe allergic reaction (swelling, breathing difficulty)
- Confusion (more likely in older adults or with kidney problems)
- Fast or irregular heartbeat
- Severe skin reaction
If a reaction is severe — for example trouble breathing, swelling of the face or throat, or collapse — go to the nearest emergency room now or call your local emergency number. Do not wait for an online consultation.
Interactions to watch
- Drugs that need stomach acid for absorption (some antifungals, certain HIV medicines)
- Tizanidine
- Other medicines affected by stomach acidity — tell your pharmacist
Who should take care
- Tell your clinician about kidney problems, as the dose may need adjusting
- Discuss pregnancy or breastfeeding before use
- Seek assessment for alarm symptoms (trouble swallowing, blood in stool or vomit, weight loss)
- Older adults should watch for confusion
- Share your full medicine list with your pharmacist