Drug interactions
Efavirenz + Valoctocogene roxaparvovec
Severity: Major
Efavirenz and Valoctocogene roxaparvovec: 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 impair hepatic expression of factor VIII from the gene therapy, reducing its effectiveness. Gene therapy can also cause transaminase elevations that overlap with antiretroviral hepatotoxicity.
What this interaction means in plain words
Efavirenz and Valoctocogene roxaparvovec 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; Valoctocogene roxaparvovec belongs to Miscellaneous.
Why it happens
Efavirenz may suppress hepatocyte transgene expression and has hepatotoxic potential, which may reduce the gene therapy response; the mechanism is not fully established.
What to do
Avoid the combination and consider switching to a different antiretroviral before gene therapy. Monitor ALT and factor VIII activity closely if unavoidable.
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 Valoctocogene roxaparvovec
Frequently asked questions
Can I take Efavirenz with Valoctocogene roxaparvovec?
MediHelp rates the interaction as major. Efavirenz and Valoctocogene roxaparvovec 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 impair hepatic expression of factor VIII from the gene therapy, reducing its effectiveness. Gene therapy can also cause transaminase elevations that overlap with antiretroviral hepatotoxicity.
How serious is the interaction between Efavirenz and Valoctocogene roxaparvovec?
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 consider switching to a different antiretroviral before gene therapy. Monitor ALT and factor VIII activity closely if unavoidable.
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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