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What is this medication?

Antacid, Histamine H2 Receptor Antagonist

Cimetidine is indicated for the treatment of gastroesophageal reflux disease (GERD), or heart burn.

How does this medication work? 

Cimetidine inhibits the H2 histamine receptor in stomach parietal cells which inhibits gastric acid secretion, gastric volume reduction, and raises pH level.

How should I take this medication? 

Oral: Take 400 mg 4 times daily or 800 mg twice daily for prescription therapy.  200-400 mg once daily for over the counter treatment of heartburn.

How to Take: Follow instructions provided by physician/pharmacy label, take consistently at same times each day with food unless otherwise directed.

What should I watch for while using this medication? 

Before starting Cimetidine make sure your physician is aware of any allergies or medications you currently take, if you have liver disease, kidney disease, gastric malignancy or are pregnant or breastfeeding. Long term use may result in B12 deficiency due to poor absorption. Some rare cases of reversible confusion have been reported in the elderly, severely ill, and those with liver or kidney impairment.

What if I miss a dose?

If you miss a dose of medication, try to take it as soon as possible. However, if it is almost time for your next dose, take only that scheduled dose. Do not take double or extra doses.

How should I store this medication?

Keep out of the reach of children at all times. Store at room temperature, 59 to 86° F (15 to 30° C). Protect from light. Keep the container tightly closed. Properly dispose of any unused medication after the expiration date.

What are the possible side effects of using this medication?

Headache, dizziness, drowsiness, gynecomastia, or diarrhea.

Note this is not a complete list of side effects for Cimetidine, only common ones.