Drug interactions
Efavirenz + Zanubrutinib
Severity: Major
Efavirenz and Zanubrutinib: 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
Efavirenz may reduce zanubrutinib exposure and compromise its efficacy in B-cell malignancies. Moderate CYP3A inducers are advised against in labeling.
What this interaction means in plain words
Efavirenz and Zanubrutinib 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.
Efavirenz belongs to Anti Virals; Zanubrutinib belongs to Oncology.
Why it happens
Efavirenz induces CYP3A4, increasing zanubrutinib metabolism.
What to do
Avoid the combination and prefer a non-inducing antiretroviral. If unavoidable, increase zanubrutinib to the labeled dose and return to the usual dose when efavirenz is stopped.
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 Efavirenz
- Cobimetinib + Efavirenz Contraindicated
- Dienogest / estradiol valerate + Efavirenz Contraindicated
- Dihydroergotamine intranasal + Efavirenz Contraindicated
- Dihydroergotamine + Efavirenz Contraindicated
- Doravirine + Efavirenz Contraindicated
- Efavirenz + Elbasvir / grazoprevir Contraindicated
Other interactions of Zanubrutinib
Frequently asked questions
Can I take Efavirenz with Zanubrutinib?
MediHelp rates the interaction as major. Efavirenz and Zanubrutinib 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. Efavirenz may reduce zanubrutinib exposure and compromise its efficacy in B-cell malignancies. Moderate CYP3A inducers are advised against in labeling.
How serious is the interaction between Efavirenz and Zanubrutinib?
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 prefer a non-inducing antiretroviral. If unavoidable, increase zanubrutinib to the labeled dose and return to the usual dose when efavirenz is stopped.
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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