Drug interactions
Metronidazole + Tamsulosin
Severity: Minor
Metronidazole and Tamsulosin: minor interaction.
Last updated
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.
Summary
Metronidazole has at most weak CYP3A4 inhibitory activity, so any increase in tamsulosin exposure is probably small. Clinical consequences are unlikely.
What this interaction means in plain words
Metronidazole and Tamsulosin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Metronidazole belongs to Anti Parasitic; Tamsulosin belongs to Genitourinary.
Why it happens
Metronidazole may weakly inhibit CYP3A4, though the effect is not well established.
What to do
No routine adjustment is needed. Watch for dizziness or orthostatic hypotension.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Tamsulosin
- Alfuzosin + Tamsulosin Major
- Avanafil + Tamsulosin Major
- Ceritinib + Tamsulosin Major
- Clarithromycin + Tamsulosin Major
- Cobicistat + Tamsulosin Major
- Doxazosin + Tamsulosin Major
Other interactions of Metronidazole
- Ethanol + Metronidazole Contraindicated
- Metronidazole + Pimozide Contraindicated
- Amiodarone + Metronidazole Major
- Disulfiram + Metronidazole Major
- Ergotamine + Metronidazole Major
- Lomitapide + Metronidazole Major
Frequently asked questions
Can I take Metronidazole with Tamsulosin?
MediHelp rates the interaction as minor. Metronidazole and Tamsulosin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Metronidazole has at most weak CYP3A4 inhibitory activity, so any increase in tamsulosin exposure is probably small. Clinical consequences are unlikely.
How serious is the interaction between Metronidazole and Tamsulosin?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: No routine adjustment is needed. Watch for dizziness or orthostatic hypotension.
What other medicines interact with Tamsulosin?
MediHelp also lists interactions of Tamsulosin with, for example, Alfuzosin, Avanafil, Ceritinib. The full list is on the Tamsulosin page.
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