Famotidine
Also sold as: Pepcid
No prescription neededAcidity and ulcers
Comes as:TabletInjection
Usual adult dose
Usual adult dose: 20 mg twice a day or 40 mg at night for ulcers or reflux; 10 to 20 mg when needed for heartburn (no more than 40 mg a day for self-care). Lower doses in kidney disease.
Your doctor may give you a different dose. Children's doses depend on weight.
Side effects
Common
- headache
- dizziness
- constipation or diarrhoea
Serious — get help
Stop taking it and see a doctor straight away if you notice:
- confusion (especially in elderly or kidney disease)
- irregular heartbeat
- severe allergic reaction
Do not take it, or take care, if
- Kidney disease (dose must be reduced)
- Warning signs such as weight loss, trouble swallowing, vomiting blood or black stools — see a doctor first
- Heartburn lasting more than 2 weeks needs a doctor
Interactions
Medicines that can react with this one.
Moderate2 medicinesTake together only with care. Ask your doctor or pharmacist.
- Itraconazole
Reduced stomach acid lowers absorption of itraconazole capsules.
- Ketoconazole