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Cimetidine is used in the treatment of excess acid secretion in stomach (dyspepsia), causing burning pain (heartburn), inflammation and ulcer formation (with or without bleeding) in food pipe, stomach and duodenum (small intestine).

How it works

Cimetidine belongs to the class of drugs called as anti-histamine or H2 receptor blocker, which reduces the production of acid in both fasting and fed state.

Common side effects

Oligospermia (low sperm count), Abnormal breast enlargement in male, Diarrhoea, Dizziness, Confusion, Hair loss, Headache, Impotence, Loss of libido, Rash, Fatigue


No medicine available

Expert advice

  • To prevent heartburn take cimetidine 30 minutes before eating foods or drinking liquids that causes heartburn.
  • Cimetidine may cause dizziness or drowsiness. Do not drive or operate any machinery until you feel well.
  • Do not take more than the recommended dose or use for > 2 weeks without checking with your doctor.
  • Tell your doctor if you are taking blood thinning agents, drugs to prevent fits, bronchodilators (to relieve breathing), anti-arrythmics (drugs used to slow the heart rate) or drugs to prevent transplant rejection.
  • Consult your doctor if you are suffering from kidney or liver disease.
  • Do not take or discontinue the treatment if use of cimetidine is causing breast enlargement in male patients.
  • Tell your doctor if you are or planning to become pregnant or are breastfeeding.

Frequently asked questions


Q. Is cimetidine an antacid/ an antihistamine/ proton pump inhibitor?
Cimetidine is anti-histamine and H2 receptor blocker that reduces excessive stomach acid secretion. It is not proton pump inhibitor.
Q. Does cimetidine cause weight gain or hair loss?
Cimetidine can cause hair loss but its use has not shown to cause weight gain.
Q. Does cimetidine work for molluscum?
There are reports of oral cimetidine being used effectively against molluscum in children. Please consult your doctor before taking the drug.

Content on this page was last updated on 30 September, 2016, by Dr. Varun Gupta (MD Pharmacology)