Drug reference
cimetidine
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Drug class
Gastrointestinal Tract (H2-Receptor Blockers)
Mechanism of action
H2-receptor antagonist; blocks H2-receptors of gastric parietal cells, leading to inhibition of gastric secretions, Relative Potency: 1.
Common side effects
- Dizziness
- Somnolence
- Headache
- Gynecomastia
Contraindications
- Hypersensitivity to cimetidine or other H2 receptor antagonists
Known interactions (3)
- cimetidine + dofetilide Contraindicated
- cimetidine + Dextromethorphan Moderate
- cimetidine + Trimethoprim/Sulfamethoxazole Moderate
Related conditions
Frequently asked questions
What drug class is cimetidine?
cimetidine belongs to: Gastrointestinal Tract.
How does cimetidine work?
H2-receptor antagonist; blocks H2-receptors of gastric parietal cells, leading to inhibition of gastric secretions, Relative Potency: 1.
What are the common side effects of cimetidine?
Dizziness, Somnolence, Headache, Gynecomastia
Which drugs interact with cimetidine?
dofetilide, Dextromethorphan, Trimethoprim/Sulfamethoxazole
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.