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CimetidineOver the counter
Pronounced sy-MET-i-deen
Brand names: Tagamet
Type: H2 blocker (acid reducer) · All Digestive (GI) Medicines
What Cimetidine is used for
- Heartburn
- Stomach and intestinal ulcers
- Acid reflux
◆ Kidney note
Cleared by the kidneys — the dose is lowered when kidney function is reduced; it also raises the creatinine reading slightly without truly harming the kidney.
Common side effects
- Headache
- Dizziness
- Diarrhea
- Breast enlargement in men with long use
Important cautions
- Interacts with very many medicines because it slows their breakdown — a full medication review matters, and famotidine is usually preferred today
How it comes
Tablets, liquid. This guide lists forms only — it never lists strengths or doses.
Related medicines — Digestive (GI) Medicines
Please note: This page is a patient-education summary, not medical advice, and it deliberately contains no doses. Medicines affect everyone differently — always follow your own prescription and talk to your doctor or pharmacist before starting, stopping or changing any medicine.