Drug interactions
Estradiol vaginal + Metronidazole
Severity: Minor
Estradiol vaginal and Metronidazole: 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
Vaginal estradiol has low systemic exposure, and estradiol is partly metabolized by CYP3A4. Metronidazole's weak CYP3A4 effect is unlikely to produce a clinically meaningful change in estradiol levels.
What this interaction means in plain words
Estradiol vaginal and Metronidazole have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Possible weak inhibition of CYP3A4-mediated estradiol metabolism.
What to do
No action is needed; the two can be used together as clinically indicated.
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 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 Estradiol vaginal with Metronidazole?
MediHelp rates the interaction as minor. Estradiol vaginal and Metronidazole have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Vaginal estradiol has low systemic exposure, and estradiol is partly metabolized by CYP3A4. Metronidazole's weak CYP3A4 effect is unlikely to produce a clinically meaningful change in estradiol levels.
How serious is the interaction between Estradiol vaginal and Metronidazole?
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 action is needed; the two can be used together as clinically indicated.
What other medicines interact with Metronidazole?
MediHelp also lists interactions of Metronidazole with, for example, Ethanol, Pimozide, Amiodarone. The full list is on the Metronidazole page.
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