Drug interactions
Efavirenz + Netupitant / palonosetron
Severity: Moderate
Efavirenz and Netupitant / palonosetron: 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
Efavirenz may reduce netupitant exposure and weaken antiemetic protection against chemotherapy-induced nausea and vomiting.
What this interaction means in plain words
Efavirenz and Netupitant / palonosetron 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.
Why it happens
Efavirenz induces CYP3A4, which is the main metabolic pathway for netupitant.
What to do
Avoid in patients chronically using efavirenz where possible, or monitor for breakthrough emesis and add other antiemetics.
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 Efavirenz
- Cobimetinib + Efavirenz Contraindicated
- Dienogest / estradiol valerate + Efavirenz Contraindicated
- Dihydroergotamine intranasal + Efavirenz Contraindicated
- Dihydroergotamine + Efavirenz Contraindicated
- Doravirine + Efavirenz Contraindicated
- Efavirenz + Elbasvir / grazoprevir Contraindicated
Frequently asked questions
Can I take Efavirenz with Netupitant / palonosetron?
MediHelp rates the interaction as moderate. Efavirenz and Netupitant / palonosetron 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. Efavirenz may reduce netupitant exposure and weaken antiemetic protection against chemotherapy-induced nausea and vomiting.
How serious is the interaction between Efavirenz and Netupitant / palonosetron?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid in patients chronically using efavirenz where possible, or monitor for breakthrough emesis and add other antiemetics.
What other medicines interact with Efavirenz?
MediHelp also lists interactions of Efavirenz with, for example, Cobimetinib, Dienogest / estradiol valerate, Dihydroergotamine intranasal. The full list is on the Efavirenz page.
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