Drug interactions
Dexamethasone-neomycin-polymyxin + Letermovir
Severity: Minor
Dexamethasone-neomycin-polymyxin 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 can increase dexamethasone concentrations. Systemic corticosteroid effects such as hyperglycemia, fluid retention and adrenal suppression may be amplified. Topical use of this product gives little systemic exposure, so the effect is likely small.
What this interaction means in plain words
Dexamethasone-neomycin-polymyxin 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.
Dexamethasone-neomycin-polymyxin belongs to Anti Bacterial; Letermovir belongs to Anti Virals.
Why it happens
Letermovir inhibits CYP3A4, reducing dexamethasone clearance.
What to do
No adjustment is needed for short topical use. If dexamethasone is given systemically, monitor for steroid adverse effects and consider reducing the dose.
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 Dexamethasone-neomycin-polymyxin
- Dexamethasone-neomycin-polymyxin + Ketorolac Major
- Dexamethasone-neomycin-polymyxin + Lapatinib Major
- Dexamethasone-neomycin-polymyxin + Levofloxacin Major
- Dexamethasone-neomycin-polymyxin + Mifepristone Major
- Dexamethasone-neomycin-polymyxin + Moxifloxacin Major
- Aldesleukin + Dexamethasone-neomycin-polymyxin Moderate
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 Dexamethasone-neomycin-polymyxin with Letermovir?
MediHelp rates the interaction as minor. Dexamethasone-neomycin-polymyxin 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 can increase dexamethasone concentrations. Systemic corticosteroid effects such as hyperglycemia, fluid retention and adrenal suppression may be amplified. Topical use of this product gives little systemic exposure, so the effect is likely small.
How serious is the interaction between Dexamethasone-neomycin-polymyxin 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 adjustment is needed for short topical use. If dexamethasone is given systemically, monitor for steroid adverse effects and consider reducing the dose.
What other medicines interact with Dexamethasone-neomycin-polymyxin?
MediHelp also lists interactions of Dexamethasone-neomycin-polymyxin with, for example, Ketorolac, Lapatinib, Levofloxacin. The full list is on the Dexamethasone-neomycin-polymyxin page.
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