Drug interactions
Enzalutamide + Ethinylestradiol
Severity: Major
Enzalutamide and Ethinylestradiol: 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
Enzalutamide induces CYP3A4 and may lower ethinylestradiol exposure. When used for contraception, this may reduce efficacy and cause breakthrough bleeding.
What this interaction means in plain words
Enzalutamide and Ethinylestradiol 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.
Why it happens
Enzalutamide induces CYP3A4, increasing ethinylestradiol metabolism.
What to do
Do not rely on hormonal contraceptives alone; add a barrier method or use a non-hormonal option. For other indications, monitor response and adjust dose.
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 Enzalutamide
- Doravirine + Enzalutamide Contraindicated
- Elbasvir / grazoprevir + Enzalutamide Contraindicated
- Ensitrelvir + Enzalutamide Contraindicated
- Enzalutamide + Fostemsavir Contraindicated
- Enzalutamide + Isavuconazonium Contraindicated
- Enzalutamide + Lenacapavir Contraindicated
Frequently asked questions
Can I take Enzalutamide with Ethinylestradiol?
MediHelp rates the interaction as major. Enzalutamide and Ethinylestradiol 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. Enzalutamide induces CYP3A4 and may lower ethinylestradiol exposure. When used for contraception, this may reduce efficacy and cause breakthrough bleeding.
How serious is the interaction between Enzalutamide and Ethinylestradiol?
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 rely on hormonal contraceptives alone; add a barrier method or use a non-hormonal option. For other indications, monitor response and adjust dose.
What other medicines interact with Enzalutamide?
MediHelp also lists interactions of Enzalutamide with, for example, Doravirine, Elbasvir / grazoprevir, Ensitrelvir. The full list is on the Enzalutamide page.
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