Drug interactions
Belzutifan + Ethinyl estradiol-levonorgestrel
Severity: Major
Belzutifan and Ethinyl estradiol-levonorgestrel: 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
Belzutifan induces CYP3A4 and can reduce hormonal contraceptive exposure, leading to contraceptive failure or breakthrough bleeding. Belzutifan is teratogenic, so pregnancy prevention is critical.
What this interaction means in plain words
Belzutifan and Ethinyl estradiol-levonorgestrel 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.
Belzutifan belongs to Miscellaneous; Ethinyl estradiol-levonorgestrel belongs to Endocrine.
Why it happens
CYP3A4 induction by belzutifan increases metabolism of ethinyl estradiol and levonorgestrel.
What to do
Use an effective nonhormonal contraceptive during treatment and for the period in labeling after the last dose. Do not rely on hormonal methods alone.
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 Ethinyl estradiol-levonorgestrel
- Ethinyl estradiol-levonorgestrel + Fezolinetant Contraindicated
- Ethinyl estradiol-levonorgestrel + Ombitasvir / paritaprevir / ritonavir and dasabuvir Contraindicated
- Ethinyl estradiol-levonorgestrel + Tranexamic acid Contraindicated
- Aminocaproic acid + Ethinyl estradiol-levonorgestrel Major
- Amobarbital + Ethinyl estradiol-levonorgestrel Major
- Anastrozole + Ethinyl estradiol-levonorgestrel Major
Other interactions of Belzutifan
Frequently asked questions
Can I take Belzutifan with Ethinyl estradiol-levonorgestrel?
MediHelp rates the interaction as major. Belzutifan and Ethinyl estradiol-levonorgestrel 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. Belzutifan induces CYP3A4 and can reduce hormonal contraceptive exposure, leading to contraceptive failure or breakthrough bleeding. Belzutifan is teratogenic, so pregnancy prevention is critical.
How serious is the interaction between Belzutifan and Ethinyl estradiol-levonorgestrel?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Use an effective nonhormonal contraceptive during treatment and for the period in labeling after the last dose. Do not rely on hormonal methods alone.
What other medicines interact with Ethinyl estradiol-levonorgestrel?
MediHelp also lists interactions of Ethinyl estradiol-levonorgestrel with, for example, Fezolinetant, Ombitasvir / paritaprevir / ritonavir and dasabuvir, Tranexamic acid. The full list is on the Ethinyl estradiol-levonorgestrel page.
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