Drug interactions
Etravirine + Letermovir
Severity: Major
Etravirine and Letermovir: major interaction.
Last updated Sources: US FDA label
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
Etravirine may reduce letermovir exposure and diminish CMV prophylaxis. Combined use is not recommended in labeling.
What this interaction means in plain words
Etravirine and Letermovir 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.
Etravirine belongs to Anti Virals; Letermovir belongs to Anti Virals.
Why it happens
Etravirine induces metabolic enzymes, which accelerates letermovir clearance.
What to do
Avoid the combination and select an alternative antiretroviral without inducing activity. If unavoidable, monitor for CMV reactivation.
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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References
Other interactions of Letermovir
- Ergotamine + Letermovir Contraindicated
- Letermovir + Pimozide Contraindicated
- Apalutamide + Letermovir Major
- Atorvastatin + Letermovir Major
- Carbamazepine + Letermovir Major
- Colchicine + Letermovir Major
Other interactions of Etravirine
- Efavirenz + Etravirine Contraindicated
- Etravirine + Isavuconazole Contraindicated
- Amobarbital + Etravirine Major
- Apalutamide + Etravirine Major
- Carbamazepine + Etravirine Major
- Cobicistat + Etravirine Major
Frequently asked questions
Can I take Etravirine with Letermovir?
MediHelp rates the interaction as major. Etravirine and Letermovir 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. Etravirine may reduce letermovir exposure and diminish CMV prophylaxis. Combined use is not recommended in labeling.
How serious is the interaction between Etravirine and Letermovir?
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 select an alternative antiretroviral without inducing activity. If unavoidable, monitor for CMV reactivation.
What other medicines interact with Letermovir?
MediHelp also lists interactions of Letermovir with, for example, Ergotamine, Pimozide, Apalutamide. The full list is on the Letermovir page.
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