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Famotidine Patient Tips

Medically reviewed on Aug 28, 2017 by C. Fookes, BPharm.

How it works

  • Famotidine reduces the secretion of gastric acid in the stomach by blocking the effect of histamine on histamine H2-receptors located on the parietal cells lining the stomach wall. Histamine is the chemical transmitter that stimulates the parietal cells to release gastric acid. By blocking H2 receptors, famotidine prevents histamine from having this effect, thereby reducing gastric acid secretion.
  • Famotidine is specific for H2 receptors (other drugs, called antihistamines, block H1 receptors which are primarily involved with allergic-type reactions).
  • Famotidine belongs to a group of drugs known as H2 receptor antagonists (also called H2 blockers).

Upsides

  • Used for the short-term treatment of active duodenal or gastric ulcers.
  • May be used for up to 1 year for the maintenance treatment of healed duodenal or gastric ulcers.
  • Reduces stomach acid secretion so may be used in the treatment of gastroesophageal reflux disease (GERD) or hypersecretory conditions such as Zollinger-Ellison syndrome or systemic mastocytosis.
  • May also be used in the treatment and maintenance of endoscopically diagnosed erosive esophagitis.
  • Famotidine may be sold over-the-counter in approved packaging which means adults and children older than 12 years may self-medicate with famotidine for mild gastrointestinal complaints such as occasional heartburn, indigestion, or sour stomach brought on by certain foods.
  • May be less likely to interact with other medications than some other H2 blockers.
  • May be used in addition to antacids.
  • Generic famotidine is available.

Downsides

If you are between the ages of 18 and 60, take no other medication or have no other medical conditions, side effects you are more likely to experience include:

  • A headache and gastrointestinal side effects (such as constipation, diarrhea, nausea, abdominal pain) are the most commonly reported side effects. Other side effects are rare.
  • A response to famotidine does not mean that your symptoms are not due to gastric or duodenal cancer (stomach cancer affects approximately 28,000 people in the U.S. each year; the risk is higher in older people). Endoscopy is the only way to do this.
  • The dosage of famotidine should be adjusted in people with moderate kidney disease. No data are available to make recommendations about dosage in people with liver disease.

Notes: In general, seniors or children, people with certain medical conditions (such as liver or kidney problems, heart disease, diabetes, seizures) or people who take other medications are more at risk of developing a wider range of side effects. For a complete list of all side effects, click here.

Bottom Line

Famotidine is an acid suppressing agent that may be used to treat a wide range of gastric-acid related disorders including gastric ulcers, heartburn, and GERD. A headache is the most common side effect and it appears to interact with few other drugs.

Tips

  • May be taken with or without food. Take with a glass of water and take the exact dosage as directed on the packet (self-medicating) or by your doctor (prescribed).
  • Should only be taken for short periods of time. If you feel you need to keep taking famotidine, talk with your doctor.
  • Antacids may be taken alongside famotidine if needed for gastric-acid associated pain.
  • Do not self-medicate with famotidine if you: are over the age of 40 and this is the first time you have had heartburn or indigestion; have a family history of gastric cancer; have coughing spells; use NSAIDs anti-inflammatories (such as aspirin or ibuprofen); have difficulty or pain when swallowing; already take other drugs (other than antacids) for indigestion or heartburn; are pregnant or breastfeeding or have blood in your vomit or stools. Instead, make an appointment with your doctor.
  • Some symptoms of stomach cancer may be similar to heartburn. Seek medical advice if your symptoms are persistent or severe.

Response and Effectiveness

Starts to suppress gastric acid within an hour of taking. The maximum effect depends on dose and occurs within one to three hours. The effect of famotidine lasts for 10 to 12 hours after a single dose.

  • Peak effects are reached within one to three hours of taking a dose. Symptomatic relief for GERD occurs within 24 hours after starting therapy with famotidine.
  • One dose of famotidine substantially inhibits secretion of gastric acid for 10 to 12 hours.
  • Food does not appear to affect absorption of famotidine or peak concentrations.

References

Famotidine [Package Insert]. Revised 07/2017. Fresenius Kabi USA, LLC https://www.drugs.com/pro/famotidine-tablets.html

  • Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use famotidine only for the indication prescribed.
  • Disclaimer: Every effort has been made to ensure that this information is accurate, up-to-date, and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. This drug information does not endorse drugs, diagnose patients or recommend therapy. It is an informational resource designed as a supplement to, and not a substitute for, the expertise, skill, knowledge and judgment of healthcare practitioners. The absence of a warning for a given drug or drug combination in no way should be construed to indicate that the drug or drug combination is safe, effective or appropriate for any given patient. Drugs.com does not assume any responsibility for any aspect of healthcare administered with the aid of this information. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the drugs you are taking, check with your doctor, nurse or pharmacist.

Copyright 1996-2017 Drugs.com. Revision Date: 2017-08-28 01:55:04

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