Drug interactions
Belzutifan + Cyclophosphamide
Severity: Minor
Belzutifan and Cyclophosphamide: minor 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 is a weak CYP3A4 inducer, which could slightly lower exposure of CYP3A4-dependent steps in cyclophosphamide activation. Cyclophosphamide is activated mainly by CYP2B6 and CYP2C9, with a smaller CYP3A4 contribution. The effect is likely minor.
What this interaction means in plain words
Belzutifan and Cyclophosphamide have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Belzutifan belongs to Miscellaneous; Cyclophosphamide belongs to Oncology.
Why it happens
CYP3A4 induction by belzutifan may modestly alter cyclophosphamide bioactivation and clearance.
What to do
No empirical dose change is needed. Monitor response and toxicity during co-therapy.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Cyclophosphamide
Other interactions of Belzutifan
Frequently asked questions
Can I take Belzutifan with Cyclophosphamide?
MediHelp rates the interaction as minor. Belzutifan and Cyclophosphamide have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Belzutifan is a weak CYP3A4 inducer, which could slightly lower exposure of CYP3A4-dependent steps in cyclophosphamide activation. Cyclophosphamide is activated mainly by CYP2B6 and CYP2C9, with a smaller CYP3A4 contribution. The effect is likely minor.
How serious is the interaction between Belzutifan and Cyclophosphamide?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: No empirical dose change is needed. Monitor response and toxicity during co-therapy.
What other medicines interact with Cyclophosphamide?
MediHelp also lists interactions of Cyclophosphamide with, for example, Adenovirus types 4 and 7 live, Belatacept, Bendamustine. The full list is on the Cyclophosphamide page.
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