Drug interactions
Darunavir + Erlotinib
Severity: Major
Darunavir and Erlotinib: 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
Darunavir, usually given with ritonavir or cobicistat, strongly inhibits CYP3A4 and can raise erlotinib concentrations. This increases the risk of diarrhea, rash and other adverse effects.
What this interaction means in plain words
Darunavir and Erlotinib 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.
Darunavir belongs to Anti Virals; Erlotinib belongs to Oncology.
Why it happens
Boosted darunavir inhibits CYP3A4, reducing erlotinib metabolism.
What to do
Consider an alternative antiretroviral regimen. If combined, monitor closely and reduce erlotinib dose in steps if severe reactions occur.
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 Erlotinib
- Amobarbital + Erlotinib Major
- Apalutamide + Erlotinib Major
- Carbamazepine + Erlotinib Major
- Cobicistat + Erlotinib Major
- Dexlansoprazole + Erlotinib Major
- Enzalutamide + Erlotinib Major
Other interactions of Darunavir
- Alfuzosin + Darunavir Contraindicated
- Avanafil + Darunavir Contraindicated
- Darunavir + Dronedarone Contraindicated
- Darunavir + Eletriptan Contraindicated
- Darunavir + Ergotamine Contraindicated
- Darunavir + Flibanserin Contraindicated
Frequently asked questions
Can I take Darunavir with Erlotinib?
MediHelp rates the interaction as major. Darunavir and Erlotinib 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. Darunavir, usually given with ritonavir or cobicistat, strongly inhibits CYP3A4 and can raise erlotinib concentrations. This increases the risk of diarrhea, rash and other adverse effects.
How serious is the interaction between Darunavir and Erlotinib?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Consider an alternative antiretroviral regimen. If combined, monitor closely and reduce erlotinib dose in steps if severe reactions occur.
What other medicines interact with Erlotinib?
MediHelp also lists interactions of Erlotinib with, for example, Amobarbital, Apalutamide, Carbamazepine. The full list is on the Erlotinib page.
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