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Famotidine is a custom pharmacy drug classified in the family of drugs known as histamine-2 blockers. Famotidine is most often used as a drug to decrease stomach acid in patients who may have Zollinger-Ellison syndrome, gastroesophageal reflux disease, and potentially other conditions that center around the issue of acid back-up from the stomach. Famotidine is also used in the treatment of ulcers (sores) in the intestines and stomach.


Famotidine may be prescribed in various oral forms such as a tablet or suspension. Typically famotidine is taken one time per day at bedtime, or two to four times per day as directed by your doctor. Follow product packaging and doctor's instructions carefully. Famotidine may be part of an overall treatment regimen that includes lifestyle and diet changes; consult with your doctor regarding your plan for improved health.


Side effects are possible with most drugs. Famotidine users may experience several, few, or no side effects. Consult with your doctor about the possible side effects. Common side effects seen with famotidine are:

  • Dizziness
  • Headache
  • Diarrhea
  • Constipation

Other side effects are possible. If any of the above or any other side effects are encountered, observe your condition and seek medical assistance if you feel it is needed, and certainly if any side effects are increasing or persisting.

Severe Side Effects:

While some patients tolerate famotidine well, others may experience severe side effects. Watch for the following severe side effects and seek medical assistance immediately if experienced:

Pounding Heartbeat Accompanied by Extreme Dizziness
Unusual Muscle Tenderness or Pain (especially if you are experiencing a fever or dark colored urine also)


Consult with your doctor for a full overview of possible contraindications.

IMPORTANT: Do not take famotidine unless specifically cleared by a doctor who knows your full medical history if you have any of the following conditions:

  • Liver Problems
  • Stomach Cancer
  • Moderate up to Severe Kidney Dysfunction

If you are pregnant or breastfeeding or planning to begin breastfeeding
do not take famotidine unless you have first consulted with your doctor about your options and risks.

NOTE: Many drugs may negatively interact with famotidine. It is extremely important for anyone planning to begin taking famotidine to have an open and comprehensive discussion with their doctor about all medications, drugs, street drugs, supplements or other before beginning a course of famotidine.

  • "It is rare to find health professionals who are so willing to educate the patient on what they need to know."

    Clair C. | West Hollywood, CA