Drug interactions
Finasteride + Letermovir
Severity: Minor
Finasteride and Letermovir: minor 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
Letermovir is a moderate CYP3A inhibitor and may raise finasteride concentrations. Because finasteride is well tolerated at higher exposures, the clinical impact is expected to be small.
What this interaction means in plain words
Finasteride and Letermovir have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Finasteride belongs to Genitourinary; Letermovir belongs to Anti Virals.
Why it happens
Letermovir inhibits CYP3A4, reducing finasteride metabolism.
What to do
No empiric dose adjustment is needed; monitor for finasteride adverse effects during letermovir prophylaxis.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Finasteride
- Finasteride + Levoketoconazole Moderate
- Finasteride + Nefazodone Moderate
- Finasteride + Rifampin Moderate
- Finasteride + St john's wort Moderate
- Amobarbital + Finasteride Minor
- Aprepitant + Finasteride Minor
Other interactions of Letermovir
- Ergotamine + Letermovir Contraindicated
- Letermovir + Pimozide Contraindicated
- Apalutamide + Letermovir Major
- Atorvastatin + Letermovir Major
- Carbamazepine + Letermovir Major
- Colchicine + Letermovir Major
Frequently asked questions
Can I take Finasteride with Letermovir?
MediHelp rates the interaction as minor. Finasteride and Letermovir have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Letermovir is a moderate CYP3A inhibitor and may raise finasteride concentrations. Because finasteride is well tolerated at higher exposures, the clinical impact is expected to be small.
How serious is the interaction between Finasteride and Letermovir?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: No empiric dose adjustment is needed; monitor for finasteride adverse effects during letermovir prophylaxis.
What other medicines interact with Finasteride?
MediHelp also lists interactions of Finasteride with, for example, Levoketoconazole, Nefazodone, Rifampin. The full list is on the Finasteride page.
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