Drug interactions
Exemestane + Rifapentine
Severity: Major
Exemestane and Rifapentine: major interaction.
Last updated Sources: US FDA label
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
Rifapentine is a strong CYP3A4 inducer expected to substantially reduce exemestane concentrations and potentially diminish its efficacy.
What this interaction means in plain words
Exemestane and Rifapentine 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.
Exemestane belongs to Oncology; Rifapentine belongs to Anti Bacterial.
Why it happens
Rifapentine induces CYP3A4, increasing exemestane clearance.
What to do
Increase exemestane to 50 mg daily after a meal while on rifapentine, and monitor response.
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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References
Other interactions of Exemestane
Other interactions of Rifapentine
- Ledipasvir-sofosbuvir + Rifapentine Contraindicated
- Lorlatinib + Rifapentine Contraindicated
- Lurasidone + Rifapentine Contraindicated
- Ranolazine + Rifapentine Contraindicated
- Rifapentine + Sofosbuvir-velpatasvir Contraindicated
- Rifapentine + Sofosbuvir-velpatasvir-voxilaprevir Contraindicated
Frequently asked questions
Can I take Exemestane with Rifapentine?
MediHelp rates the interaction as major. Exemestane and Rifapentine 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. Rifapentine is a strong CYP3A4 inducer expected to substantially reduce exemestane concentrations and potentially diminish its efficacy.
How serious is the interaction between Exemestane and Rifapentine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Increase exemestane to 50 mg daily after a meal while on rifapentine, and monitor response.
What other medicines interact with Exemestane?
MediHelp also lists interactions of Exemestane with, for example, Bazedoxifene-conjugated estrogens, Desogestrel-ethinyl estradiol, Estradiol. The full list is on the Exemestane page.
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