Drug interactions
Efavirenz + Pazopanib
Severity: Major
Efavirenz and Pazopanib: 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
Pazopanib can prolong the QT interval and cause torsades de pointes, and efavirenz may add to this effect. Efavirenz may also lower pazopanib exposure through CYP3A4 induction.
What this interaction means in plain words
Efavirenz and Pazopanib 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; Pazopanib belongs to Oncology.
Why it happens
Additive QT prolongation, plus CYP3A4 induction by efavirenz.
What to do
Prefer an antiretroviral without QT or CYP3A effects. If used together, monitor the ECG and electrolytes and watch for reduced tumor 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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Efavirenz and Pazopanib, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 14 days on the web. No card needed.
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 Pazopanib
- Adagrasib + Pazopanib Major
- Amiodarone + Pazopanib Major
- Amisulpride + Pazopanib Major
- Amobarbital + Pazopanib Major
- Anagrelide + Pazopanib Major
- Apalutamide + Pazopanib Major
Frequently asked questions
Can I take Efavirenz with Pazopanib?
MediHelp rates the interaction as major. Efavirenz and Pazopanib 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. Pazopanib can prolong the QT interval and cause torsades de pointes, and efavirenz may add to this effect. Efavirenz may also lower pazopanib exposure through CYP3A4 induction.
How serious is the interaction between Efavirenz and Pazopanib?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Prefer an antiretroviral without QT or CYP3A effects. If used together, monitor the ECG and electrolytes and watch for reduced tumor 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.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
