Generic Name: famotidine

Do not take antacids within 1 hour of taking famotidine. Antacids may decrease the effectiveness of famotidine.

Famotidine may affect the actions of other medications by changing the acidity of the stomach. Talk to your doctor and pharmacist before taking any prescription or over-the-counter medicines during treatment with famotidine, including herbal products.

If you experience any of the following serious side effects, stop taking famotidine and contact your doctor immediately or seek emergency medical treatment.

• an allergic reaction (difficulty breathing; closing of the throat; swelling of the lips, tongue, or face; or hives);

• easy or unusual bruising or bleeding;

• bleeding gums;

• irregular heartbeat;

• yellowing of the skin or eyes; or

• a rash.

Other, less serious side effects may be more likely to occur. Continue to take famotidine and talk to your doctor if you experience

• dizziness;

• headache; or

• diarrhea, nausea, or constipation.

Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome.