Famotidine
Famotidine is an H2 receptor antagonist that reduces stomach acid. It is used for reflux symptoms, ulcer healing support, and sometimes when PPIs are unsuitable. Over-the-counter packs exist — still read labels and ask a pharmacist if you take other medicines.
This medicine is part of the Stomach acid & reflux category.
Generic name: famotidine
Quick answers
Short replies to searches people often run before speaking to a clinician. For the overview of what the medicine is used for, see the short summary under the page title above.
What is it for?
Famotidine is an H2 receptor antagonist that reduces stomach acid.
How long does it take to work?
Onset varies by condition and dose. Your GP or pharmacist can explain what to expect and when to review.
What are common side effects?
Headache, dizziness, constipation, or diarrhoea are possible.
Can you take paracetamol or ibuprofen with it?
Ask your GP or pharmacist before taking Famotidine with paracetamol or ibuprofen. Many adults use paracetamol for short periods when appropriate; NSAIDs such as ibuprofen need extra checks with your other medicines and health conditions.
More about what Famotidine is used for
Famotidine is an H2 receptor antagonist that reduces stomach acid. It is used for reflux symptoms, ulcer healing support, and sometimes when PPIs are unsuitable.
Over-the-counter packs exist — still read labels and ask a pharmacist if you take other medicines.
How does Famotidine work, and how long does it take to work?
It blocks histamine on stomach cells that stimulate acid pumps, lowering acid for several hours per dose.
Less potent acid suppression than PPIs for many people, which can be desirable in selected cases.
How and when should you take Famotidine?
Dosing may be once or twice daily or at night for night-time reflux — follow your product leaflet.
Kidney impairment often needs lower doses.
What are the common side effects of Famotidine?
Headache, dizziness, constipation, or diarrhoea are possible.
Serious side effects of Famotidine — when to get urgent help
Seek urgent help for severe allergic reactions, irregular heartbeat, or confusion in older adults with kidney problems.
What if you miss a dose of Famotidine?
Take when remembered unless nearly time for next; do not double.
Who should not take Famotidine?
Allergy to famotidine or other H2 blockers. Pregnancy and breastfeeding need advice.
Can you take paracetamol or ibuprofen with Famotidine? — other interactions
Some antifungals and HIV drugs have absorption issues with acid-lowering medicines — pharmacist checks help.
Famotidine in pregnancy and breastfeeding
Discuss with your prescriber or pharmacist before use.
Blood tests and monitoring on Famotidine
Symptom review after a few weeks; long-term acid symptoms without diagnosis should be assessed.
What might your GP prescribe instead of Famotidine?
PPIs such as Omeprazole or antacids/alginates may be used depending on symptoms.
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Reviewed by UK registered pharmacists for accuracy and clarity. Content is informational only.
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Frequently asked questions about Famotidine
People also ask — common Google searches
- What is Famotidine used for?
- Famotidine is an H2 receptor antagonist that reduces stomach acid. It is used for reflux symptoms, ulcer healing support, and sometimes when PPIs are unsuitable. Over-the-counter packs exist — still read labels and ask a pharmacist if you take other medicines.
- How long does Famotidine take to work?
- Onset varies by condition and dose. Your GP or pharmacist can explain what to expect and when to review. Always follow your prescriber’s follow-up plan.
- Can you take Famotidine with paracetamol or ibuprofen?
- Ask your GP or pharmacist before taking Famotidine with Paracetamol or Ibuprofen. Many adults use paracetamol for short periods when appropriate; NSAIDs such as ibuprofen need extra checks with your other medicines and health conditions.
- What are the side effects of Famotidine?
- Headache, dizziness, constipation, or diarrhoea are possible. See the sections below for more detail, including serious side effects and when to seek urgent help.
- Is famotidine safer than omeprazole?
- Neither is risk-free; H2 blockers suppress acid less strongly, which can mean fewer long-term PPI concerns for some short uses — your prescriber matches treatment to your situation.
- Can famotidine cause confusion?
- Central nervous system effects are rare but reported, especially with kidney problems — report new confusion promptly.
Need personalised advice?
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