Drug interactions
Belzutifan + Norethisterone
Severity: Major
Belzutifan and Norethisterone: 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 may induce CYP3A4 and lower norethisterone exposure, risking contraceptive failure or breakthrough bleeding. Belzutifan is also teratogenic, so contraceptive failure carries serious consequences.
What this interaction means in plain words
Belzutifan and Norethisterone 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; Norethisterone belongs to Endocrine.
Why it happens
Belzutifan induces CYP3A4, increasing norethisterone metabolism.
What to do
Use an effective non-hormonal contraceptive method during treatment and for the period recommended in labeling after the last dose. Do not rely on hormonal contraception 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 Norethisterone
- Acitretin + Norethisterone Contraindicated
- Amobarbital + Norethisterone Major
- Apalutamide + Norethisterone Major
- Bosentan + Norethisterone Major
- Brigatinib + Norethisterone Major
- Carbamazepine + Norethisterone Major
Other interactions of Belzutifan
Frequently asked questions
Can I take Belzutifan with Norethisterone?
MediHelp rates the interaction as major. Belzutifan and Norethisterone 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 may induce CYP3A4 and lower norethisterone exposure, risking contraceptive failure or breakthrough bleeding. Belzutifan is also teratogenic, so contraceptive failure carries serious consequences.
How serious is the interaction between Belzutifan and Norethisterone?
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 non-hormonal contraceptive method during treatment and for the period recommended in labeling after the last dose. Do not rely on hormonal contraception alone.
What other medicines interact with Norethisterone?
MediHelp also lists interactions of Norethisterone with, for example, Acitretin, Amobarbital, Apalutamide. The full list is on the Norethisterone page.
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