Famotidine is an H2 blocker that reduces stomach acid. People use it for heartburn, acid reflux, and ulcers. It starts to work within an hour.
What Is Famotidine Used For?
- Heartburn and acid indigestion
- Gastroesophageal reflux disease (GERD)
- Stomach and duodenal ulcers
- Conditions with too much stomach acid
How Does Famotidine Work?
Famotidine blocks histamine H2 receptors on the cells in your stomach that make acid. These cells then make less acid, so heartburn eases and ulcers heal.
General Dosage Information
This is general information only. Your doctor sets the right dose for you, so follow your prescription and the label.
- For ulcers or reflux, adults usually take 20 mg twice a day or 40 mg at bedtime.
- For occasional heartburn, over-the-counter doses are usually 10 mg to 20 mg, one hour before a meal.
- People with kidney problems need a lower dose.
Side Effects of Famotidine
Common Side Effects
- Headache
- Dizziness
- Constipation or diarrhea
- Tiredness
Serious Side Effects
Call your doctor or get emergency help if you notice:
- Confusion or hallucinations, mainly in older adults or people with kidney disease
- Fast or irregular heartbeat
- Swelling of the face or trouble breathing
- Black stools
Who Should Be Cautious?
- People with kidney disease
- Older adults
- Pregnant or breastfeeding women should ask their doctor
Drug Interactions
Tell your doctor and pharmacist about every medicine and supplement you take. Examples of important interactions include:
- Ketoconazole and itraconazole: famotidine lowers their absorption.
- Atazanavir and dasatinib: famotidine lowers their absorption.
- Antacids: take them at least an hour apart if your doctor advises it.
Storage and Precautions
- Store it at room temperature, away from heat, light, and moisture.
- Keep it out of the reach of children.
Frequently Asked Questions
When should I take it?
Take it before a meal that triggers heartburn, or at bedtime for night symptoms.
Is it stronger than antacids?
It works longer than antacids but more slowly. PPIs are stronger.
Can I take it daily?
Doctors advise short courses unless you have a long-term condition.
Disclaimer: This article is for information only. It is not medical advice. Please talk to your doctor about your own health.