Drug interactions
Belzutifan + Fentanyl
Severity: Moderate
Belzutifan and Fentanyl: moderate 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 inducer of CYP3A4 and may lower exposure to sensitive CYP3A4 substrates such as fentanyl. This could reduce analgesic effect, and if belzutifan is stopped, fentanyl levels could rise.
What this interaction means in plain words
Belzutifan and Fentanyl can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Belzutifan belongs to Miscellaneous; Fentanyl belongs to Musculoskeletal.
Why it happens
Induction of CYP3A4 by belzutifan increases fentanyl metabolism and lowers plasma concentrations.
What to do
Monitor pain control and titrate fentanyl as needed. Reassess the fentanyl dose and watch for respiratory depression if belzutifan is discontinued.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Fentanyl
- Alvimopan + Fentanyl Contraindicated
- Fentanyl + Isocarboxazid Contraindicated
- Fentanyl + Olanzapine / samidorphan Contraindicated
- Fentanyl + Phenelzine Contraindicated
- Fentanyl + Tranylcypromine Contraindicated
- Alfentanil + Fentanyl Major
Other interactions of Belzutifan
Frequently asked questions
Can I take Belzutifan with Fentanyl?
MediHelp rates the interaction as moderate. Belzutifan and Fentanyl can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Belzutifan is a weak inducer of CYP3A4 and may lower exposure to sensitive CYP3A4 substrates such as fentanyl. This could reduce analgesic effect, and if belzutifan is stopped, fentanyl levels could rise.
How serious is the interaction between Belzutifan and Fentanyl?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor pain control and titrate fentanyl as needed. Reassess the fentanyl dose and watch for respiratory depression if belzutifan is discontinued.
What other medicines interact with Fentanyl?
MediHelp also lists interactions of Fentanyl with, for example, Alvimopan, Isocarboxazid, Olanzapine / samidorphan. The full list is on the Fentanyl page.
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