Drug interactions
Conjugated estrogens vaginal + Fluconazole
Severity: Minor
Conjugated estrogens vaginal and Fluconazole: 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 conjugated estrogens are absorbed to a limited extent, so the effect of a CYP3A4 inhibitor is expected to be small. Any increase in systemic estrogen exposure from fluconazole is unlikely to be significant.
What this interaction means in plain words
Conjugated estrogens vaginal and Fluconazole 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 CYP3A4 inhibition by fluconazole reducing estrogen metabolism, with limited relevance given low systemic exposure.
What to do
No routine adjustment is needed. Ask about breast tenderness or unexpected bleeding if therapy is prolonged.
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 Fluconazole
- Dihydroergotamine intranasal + Fluconazole Contraindicated
- Dihydroergotamine + Fluconazole Contraindicated
- Dofetilide + Fluconazole Contraindicated
- Domperidone + Fluconazole Contraindicated
- Dronedarone + Fluconazole Contraindicated
- Erythromycin + Fluconazole Contraindicated
Frequently asked questions
Can I take Conjugated estrogens vaginal with Fluconazole?
MediHelp rates the interaction as minor. Conjugated estrogens vaginal and Fluconazole 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 conjugated estrogens are absorbed to a limited extent, so the effect of a CYP3A4 inhibitor is expected to be small. Any increase in systemic estrogen exposure from fluconazole is unlikely to be significant.
How serious is the interaction between Conjugated estrogens vaginal and Fluconazole?
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. Ask about breast tenderness or unexpected bleeding if therapy is prolonged.
What other medicines interact with Fluconazole?
MediHelp also lists interactions of Fluconazole with, for example, Dihydroergotamine intranasal, Dihydroergotamine, Dofetilide. The full list is on the Fluconazole page.
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