Cimetidine was the first of the H2 blockers, which reduce stomach acid by blocking histamine signals to the acid producing cells. It has largely been replaced by newer options, but it is still used and is still effective.

What Cimetidine Is Used For

Stomach and duodenal ulcers
Acid reflux and heartburn
Protecting the stomach lining during treatment with irritant medicines
Conditions with excess acid production

Common Side Effects

Headache and dizziness
Loose motions
Tiredness
Breast tenderness or enlargement in men with prolonged use

Precautions

Cimetidine interferes with the liver enzymes that process many other medicines, including warfarin, phenytoin and theophylline, so tell your doctor everything you take. Ulcer symptoms with weight loss, vomiting, difficulty swallowing or black stools need investigation rather than acid tablets. Helicobacter pylori is a common cause of ulcers in Pakistan and needs specific treatment.

This page is general information only. It is not a substitute for advice from your doctor or pharmacist, and it does not include dosage. Always follow the directions given to you and read the leaflet inside the pack.