Drug interactions
Netupitant-palonosetron + Phenytoin
Severity: Major
Netupitant-palonosetron and Phenytoin: 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
Phenytoin induces CYP3A4 and may substantially reduce netupitant exposure, risking loss of antiemetic efficacy. Phenytoin exposure may also be affected by other regimen drugs.
What this interaction means in plain words
Netupitant-palonosetron and Phenytoin 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.
Netupitant-palonosetron belongs to Gastrointestinal Tract; Phenytoin belongs to Central Nervous System.
Why it happens
Phenytoin induces CYP3A4, increasing netupitant metabolism.
What to do
Avoid the combination and use an antiemetic regimen less dependent on CYP3A4 exposure. If used, monitor for breakthrough emesis.
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 Netupitant-palonosetron
- Apomorphine + Netupitant-palonosetron Contraindicated
- Flibanserin + Netupitant-palonosetron Contraindicated
- Apalutamide + Netupitant-palonosetron Major
- Avapritinib + Netupitant-palonosetron Major
- Carbamazepine + Netupitant-palonosetron Major
- Cobimetinib + Netupitant-palonosetron Major
Other interactions of Phenytoin
- Artemether / lumefantrine + Phenytoin Contraindicated
- Bictegravir + Phenytoin Contraindicated
- Cabotegravir + Phenytoin Contraindicated
- Doravirine + Phenytoin Contraindicated
- Elbasvir / grazoprevir + Phenytoin Contraindicated
- Elvitegravir / cobicistat / emtricitabine / tenofovir df + Phenytoin Contraindicated
Frequently asked questions
Can I take Netupitant-palonosetron with Phenytoin?
MediHelp rates the interaction as major. Netupitant-palonosetron and Phenytoin 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. Phenytoin induces CYP3A4 and may substantially reduce netupitant exposure, risking loss of antiemetic efficacy. Phenytoin exposure may also be affected by other regimen drugs.
How serious is the interaction between Netupitant-palonosetron and Phenytoin?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid the combination and use an antiemetic regimen less dependent on CYP3A4 exposure. If used, monitor for breakthrough emesis.
What other medicines interact with Netupitant-palonosetron?
MediHelp also lists interactions of Netupitant-palonosetron with, for example, Apomorphine, Flibanserin, Apalutamide. The full list is on the Netupitant-palonosetron page.
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