Famotidine to reduce stomach acid
Granskad av Sid DajaniSenast uppdaterad av Michael Stewart, MRPharmSLast updated 16 May 2024
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Famotidine reduces the amount of acid produced by your stomach.
Any side-effects are usually mild and do not last long.
At a glance
Famotidine is a medicine that reduces the amount of acid produced in the stomach.
It treats conditions like stomach ulcers, duodenal ulcers, and acid reflux.
Take famotidine tablets exactly as your doctor tells you, either once or twice a day.
You can take the tablets before or after meals.
Common side-effects include diarrhoea, constipation, headache, and dizziness.
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About famotidine
Typ av medicin | H2-receptor antagonist |
Används för | Treatment of conditions caused by too much acid being produced in the stomach |
Tillgänglig som | Tabletter |
Famotidine belongs to a group of medicines that reduce the amount of acid produced by the cells in the lining of the stomach. They are called 'histamine H2-receptor antagonists', but are commonly also called H2 blockers.
Famotidine can be helpful in the treatment of conditions caused by too much acid being produced in the stomach. These conditions include stomach ulcers (gastric ulcers), ulcers of the upper part of the intestine (duodenal ulcers), acid reflux or heartburn (gastro-oesophageal reflux disease). Although famotidine can be helpful in the treatment of these conditions, in practice other medicines are usually tried first.
Acid is produced naturally in your stomach to help to digest food. Excessive amounts of acid can irritate the lining of your stomach, causing inflammation, ulcers and other conditions. Famotidine works by reducing the amount of acid produced by your stomach. This helps to relieve symptoms and assist the healing process where damage has already occurred.
Before taking famotidine
Tillbaka till innehållTo make sure this is the right treatment for you, before you start taking famotidine it is important that your doctor or pharmacist knows:
Om du är gravid eller ammar.
If you have any of the following symptoms: difficulty swallowing, loss of blood, weight loss, or if you are being sick.
Om du har några problem med hur dina njurar fungerar.
Om du någonsin har haft en allergisk reaktion mot en medicin.
Om du tar några andra läkemedel. Detta inkluderar alla läkemedel du tar som finns att köpa utan recept, samt växtbaserade och komplementära läkemedel.
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How to take famotidine?
Tillbaka till innehållBefore you start this treatment, read the manufacturer's printed information leaflet from inside the pack. It will give you more information about famotidine and will provide you with a full list of the side-effects which you may experience from taking it.
Take famotidine exactly as your doctor tells you to. There are two different strengths of tablet available - 20 mg and 40 mg. You may be prescribed famotidine to take twice a day, in the morning and evening, or just once daily in the evening. Your doctor will tell you what dose is right for you and the directions will be on the label of the pack to remind you about what was said to you.
You can take famotidine tablets before or after meals.
If you forget to take a dose at your usual time, you can generally take it when you remember. However, if it is nearly time to take your next dose when you remember, skip the missed dose and take your next dose when it is due. Do not take two doses together to make up for a forgotten dose.
Få ut det mesta av din behandling
Tillbaka till innehållA course of treatment can vary in length depending upon the reason why you are taking famotidine. You could be asked to take the tablets for a few weeks or for several months. Keep any appointments that you have booked with your doctor so that your progress can be checked.
Some people say that certain foods make their symptoms worse. Foods and drinks that have been suspected of this include peppermint, tomatoes, chocolate, spicy foods, hot drinks, coffee and alcoholic drinks. If it seems that a food is aggravating your symptoms, try avoiding it for a while to see if your symptoms improve. Also, try avoiding eating large meals, as these can make your symptoms worse too.
If you are overweight, this puts extra pressure on your stomach and encourages the symptoms of acid reflux. Losing some weight and eating a healthy balanced diet may help you.
Smoking increases the amount of stomach acid and may make your symptoms worse. If you are a smoker, speak with your doctor or pharmacist about how to quit.
If you buy any medicines 'over the counter', always check with a pharmacist that they are safe to take alongside your other medicines.
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Can famotidine cause problems?
Tillbaka till innehållAlong with their useful effects, most medicines can cause unwanted side-effects although not everyone experiences them. The table below contains some of the ones associated with famotidine, although these are generally mild and do not last long. You will find a full list in the manufacturer's information leaflet supplied with your medicine. The unwanted effects often improve as your body adjusts to the new medicine, but speak with your doctor or pharmacist if any of the following continue or become troublesome.
Famotidine side-effects | Vad kan jag göra om jag upplever detta? |
Diarrhoea or constipation | Drink plenty of water |
Huvudvärk | Drick mycket vatten och be din apotekare rekommendera en lämplig smärtstillande. Om huvudvärken fortsätter, informera din läkare |
Yrsel | Om det är besvärligt, prata med din läkare |
If you experience any other symptoms which you think may be due to famotidine, speak with your doctor or pharmacist for further advice.
How to store famotidine?
Tillbaka till innehållFörvara alla läkemedel utom räckhåll och synhåll för barn.
Förvara på en sval, torr plats, borta från direkt värme och ljus.
Viktig information om alla läkemedel
Tillbaka till innehållViktig information om alla läkemedel
Ta aldrig mer än den föreskrivna dosen. Om du misstänker att du eller någon annan kan ha tagit en överdos av denna medicin, gå till akutmottagningen på ditt lokala sjukhus. Ta med behållaren, även om den är tom.
Denna medicin är för dig. Ge den aldrig till andra människor även om deras tillstånd verkar vara detsamma som ditt.
Om du ska genomgå en operation eller någon tandbehandling, informera den som utför behandlingen om vilka mediciner du tar.
Behåll inte föråldrade eller oönskade mediciner. Ta dem till ditt lokala apotek som kommer att ta hand om dem åt dig.
Om du har några frågor om denna medicin, fråga din apotekare.
Rapportera biverkningar av ett läkemedel eller vaccin
Om du upplever biverkningar kan du rapportera dem online via Yellow Card website.

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Kontrollera möjliga interaktioner mellan läkemedel, kosttillskott och livsmedel innan du tar dem tillsammans.
Vanliga frågor
What is the main purpose of famotidine?
Famotidine is a medicine that reduces the amount of acid produced by cells in the lining of the stomach. This helps treat conditions caused by too much stomach acid, such as stomach ulcers, duodenal ulcers, and acid reflux (heartburn).
Are there other names for famotidine?
Yes, famotidine belongs to a group of medicines called 'histamine H2-receptor antagonists', but they are also commonly known as H2 blockers.
Can I take famotidine if I am pregnant or breastfeeding?
You should inform your doctor or pharmacist if you are pregnant or breastfeeding before starting to take famotidine, as this helps them to determine if it is the right treatment for you.
How long will I need to take famotidine for?
The length of your treatment course with famotidine can vary. It depends on the specific reason you are taking it, and you might need to take the tablets for a few weeks or even several months. Your doctor will advise you on how long you should continue the treatment.
What should I do if I forget a dose of famotidine?
If you miss a dose at your usual time, generally you should take it as soon as you remember. However, if it's nearly time for your next dose, you should skip the missed one and take your next dose when it is due. Do not take two doses at once to make up for a forgotten dose.
Are there certain foods or habits I should avoid while taking famotidine?
Some foods like peppermint, tomatoes, chocolate, spicy foods, hot drinks, coffee, and alcoholic drinks can make symptoms worse for some people. You could try avoiding them to see if your symptoms improve. Also, try to avoid large meals. If you are overweight, losing weight may help. Smoking can also increase stomach acid, so speaking to your doctor or pharmacist about quitting could be beneficial.
What are the common side-effects of famotidine and what can I do about them?
Common side-effects include diarrhoea or constipation, headache, and dizziness. For diarrhoea or constipation, drink plenty of water. For a headache, drink plenty of water and you can ask your pharmacist for a suitable painkiller. If headaches continue or dizziness becomes troublesome, you should speak with your doctor.
Vidare läsning och referenser
- Manufacturer's PIL, Famotidine 20 mg tablets; Tillomed Laboratories Ltd, The electronic Medicines Compendium. Dated August 2023.
- Mediciner Komplett BNF 89:e Utgåvan; Brittiska Läkarföreningen och Kungliga Farmaceutiska Sällskapet i Storbritannien, London.
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About the authorView full bio

Michael Stewart, MRPharmS
Medicine Leaflet Review Manager – Contractor, Pharmacist
BPharm (Hons), MRPharmS
Michael is a community pharmacist practicing in the Midlands and South Yorkshire with more than 20 years’ experience advising on medicines and medical conditions. He has a strong background in healthcare training, having produced and delivered training courses for pharmacy teams and staff of residential care settings, including nurses. He has also contributed to pharmacy advisory boards for the management of low acuity conditions in the community.
About the reviewer

Sid Dajani
Sultan Dajani qualified at the London School of Pharmacy in 1994 and became the youngest elected member of the Royal Pharmaceutical Society council since its founding in 1842.
Artikelhistorik
Informationen på denna sida är skriven och granskad av kvalificerade kliniker.
Next review due: 17 Apr 2027
16 May 2024 | Senaste versionen

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