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Updated March 06, 2008

Generic Name:

  • Cimetidine
Brand Name:
  • Tagamet
  • Tagamet-HB
  • Tagamet Tiltab
Tagament is available in both prescription and over-the-counter forms.

Why is Tagamet prescribed?

Tagamet is in a class of medications called H2 Blockers. It decreases the amount of acid made in the stomach. It is used to treat gastroesophageal reflux disease (GERD), esophagitis, and Zollinger-Ellison syndrome. Along with antibiotics, Tagamet is also used to treat peptic ulcers. Over-the-counter Tagamet is also used to prevent and treat symptoms of heartburn associated with acid indigestion and sour stomach. Many doctors only prescribe prescription-strength H2 Blockers for the treatment of ulcer and esophagitis symptoms, and have their patients use over-the-counter forms for relief of symptoms of GERD, acid indigestion, and sour stomach.

Special precautions to follow when taking Tagamet

  • Tell your doctor and pharmacist if you are allergic to Tagamet or any other drugs.

  • Tell your doctor if you are pregnant, plan to become pregnant, or are breastfeeding. If you become pregnant while taking Tagamet, call your doctor.

  • If you are taking an antacid, take it two hours before taking Tagamet.

  • Tell your doctor if you have or have ever had liver or kidney disease, human immunodeficiency virus (HIV), or acquired immunodeficiency syndrome (AIDS).

  • Tell your doctor and pharmacist what prescription and nonprescription medications or vitamins you are taking.

What if you forget a dose?

Consult your physician before taking a missed dose. Your doctor will be able to determine if it is safe to do so, or if you should wait until your next scheduled dose. Do not take a double dose to make up for a missed one.

Possible side effects of Tagamet

Tagamet may cause side effects. For most people experiencing side effects, they usually disappear after a few doses. If, however, any of the following symptoms are severe or do not go away, call your doctor:
  • Headache
  • Diarrhea
  • Dizziness
  • Drowsiness
  • Breast enlargement
The following symptoms are uncommon, but can be serious. If you experience any of them, call your doctor immediately:
  • Confusion
  • Excitement
  • Depression
  • Nervousness
  • Seeing things or hearing voices that do not exist (hallucinating)
Call your doctor at any time if you experience any unusual problems while taking this medication.

Storage conditions needed for Tagamet

Keep this medication in the container it came in, tightly closed, and out of reach of children. Store it at room temperature and away from excess heat and moisture (not in the bathroom). Throw away any medication that is outdated or no longer needed. Talk to your pharmacist about the proper disposal of your medication.



"Understanding Some of the Medications Often Prescribed for GERD & Ulcers." Common GI Problems: Volume 1. American College of Gastroenterology. 24 Apr 2007.

Kenneth R. DeVault M.D., F.A.C.G., and Donald O. Castell M.D., M.A.C.G., "Updated Guidelines for the Diagnosis and Treatment of Gastroesophageal Reflux Disease." doi: 10.1111/j.1572-0241.2005.41217.x. American College of Gastroenterology. 24 Apr 2007.

"Effectiveness of Therapies for GERD" American College of Gastroenterology. 24 Apr 2007.

Related Video
Heartburn and Acid Reflux Testing - Endoscopy
  1. About.com
  2. Health
  3. Heartburn/GERD
  4. Meds / Remedies
  5. H2 Blockers
  6. Tagamet - H2 Blocker - Treatment for Acid Reflux

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