Drug interactions
Conjugated estrogens vaginal + Metronidazole
Severity: Minor
Conjugated estrogens 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
Systemic exposure to vaginal conjugated estrogens is low and metronidazole is only a weak CYP3A4 inhibitor, so no meaningful interaction is expected.
What this interaction means in plain words
Conjugated estrogens 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
Theoretical weak CYP3A4 inhibition; no established mechanism of clinical relevance.
What to do
No action is needed beyond routine monitoring of the treated condition.
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 Conjugated estrogens vaginal with Metronidazole?
MediHelp rates the interaction as minor. Conjugated estrogens 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. Systemic exposure to vaginal conjugated estrogens is low and metronidazole is only a weak CYP3A4 inhibitor, so no meaningful interaction is expected.
How serious is the interaction between Conjugated estrogens 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 beyond routine monitoring of the treated condition.
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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