Drug interactions
Ospemifene + Rifampicin
Severity: Major
Ospemifene and Rifampicin: 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
Rifampicin considerably lowers ospemifene exposure, which may reduce its effect on dyspareunia and vaginal dryness.
What this interaction means in plain words
Ospemifene and Rifampicin 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.
Ospemifene belongs to Endocrine; Rifampicin belongs to Anti Bacterial.
Why it happens
Induction of CYP3A4, CYP2C9 and CYP2C19 by rifampicin increases ospemifene clearance.
What to do
Do not use together; choose an alternative therapy if rifampicin is required.
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 Ospemifene
- Bazedoxifene-conjugated estrogens + Ospemifene Contraindicated
- Estradiol + Ospemifene Contraindicated
- Clomiphene + Ospemifene Major
- Fluconazole + Ospemifene Major
- Ketoconazole + Ospemifene Major
- Ospemifene + Raloxifene Major
Other interactions of Rifampicin
- Cabotegravir + Rifampicin Contraindicated
- Delamanid + Rifampicin Contraindicated
- Doravirine + Rifampicin Contraindicated
- Ensitrelvir + Rifampicin Contraindicated
- Fostemsavir + Rifampicin Contraindicated
- Isavuconazole + Rifampicin Contraindicated
Frequently asked questions
Can I take Ospemifene with Rifampicin?
MediHelp rates the interaction as major. Ospemifene and Rifampicin 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. Rifampicin considerably lowers ospemifene exposure, which may reduce its effect on dyspareunia and vaginal dryness.
How serious is the interaction between Ospemifene and Rifampicin?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Do not use together; choose an alternative therapy if rifampicin is required.
What other medicines interact with Ospemifene?
MediHelp also lists interactions of Ospemifene with, for example, Bazedoxifene-conjugated estrogens, Estradiol, Clomiphene. The full list is on the Ospemifene page.
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