Drug interactions
Fluconazole + Ospemifene
Severity: Major
Fluconazole and Ospemifene: major 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
Fluconazole inhibits several enzymes involved in ospemifene clearance and increases its exposure. Labeling advises avoiding fluconazole, which is a dual CYP3A4 and CYP2C9 inhibitor, because of the higher exposure and the risk of adverse effects including thromboembolic events and endometrial effects.
What this interaction means in plain words
Fluconazole and Ospemifene can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Fluconazole belongs to Anti Fungals; Ospemifene belongs to Endocrine.
Why it happens
Fluconazole inhibits CYP3A4, CYP2C9 and CYP2C19, which metabolize ospemifene.
What to do
Avoid concomitant use with fluconazole where possible. If an antifungal is needed, use a short course of an agent that does not inhibit these enzymes or withhold ospemifene.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Fluconazole
- Dihydroergotamine intranasal + Fluconazole Contraindicated
- Dihydroergotamine + Fluconazole Contraindicated
- Dofetilide + Fluconazole Contraindicated
- Dronedarone + Fluconazole Contraindicated
- Erythromycin + Fluconazole Contraindicated
- Flibanserin + Fluconazole Contraindicated
Other interactions of Ospemifene
- Bazedoxifene-conjugated estrogens + Ospemifene Contraindicated
- Estradiol + Ospemifene Contraindicated
- Clomiphene + Ospemifene Major
- Ketoconazole + Ospemifene Major
- Ospemifene + Raloxifene Major
- Ospemifene + Rifampicin Major
Frequently asked questions
Can I take Fluconazole with Ospemifene?
MediHelp rates the interaction as major. Fluconazole and Ospemifene can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Fluconazole inhibits several enzymes involved in ospemifene clearance and increases its exposure. Labeling advises avoiding fluconazole, which is a dual CYP3A4 and CYP2C9 inhibitor, because of the higher exposure and the risk of adverse effects including thromboembolic events and endometrial effects.
How serious is the interaction between Fluconazole and Ospemifene?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid concomitant use with fluconazole where possible. If an antifungal is needed, use a short course of an agent that does not inhibit these enzymes or withhold ospemifene.
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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