Drug interactions
Efavirenz + Pralsetinib
Severity: Major
Efavirenz and Pralsetinib: 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 pralsetinib concentrations and weaken its effect against RET-driven cancers.
What this interaction means in plain words
Efavirenz and Pralsetinib 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; Pralsetinib belongs to Oncology.
Why it happens
CYP3A4 induction by efavirenz increases pralsetinib clearance.
What to do
Avoid if possible and use a non-inducing antiretroviral. If unavoidable, follow labeled dose-increase guidance and monitor response.
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 Pralsetinib
Frequently asked questions
Can I take Efavirenz with Pralsetinib?
MediHelp rates the interaction as major. Efavirenz and Pralsetinib 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 pralsetinib concentrations and weaken its effect against RET-driven cancers.
How serious is the interaction between Efavirenz and Pralsetinib?
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 if possible and use a non-inducing antiretroviral. If unavoidable, follow labeled dose-increase guidance and monitor response.
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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