Drug interactions
Dexamethasone-tobramycin + Letermovir
Severity: Moderate
Dexamethasone-tobramycin and Letermovir: moderate 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 inhibits CYP3A4 and may increase dexamethasone exposure, raising the risk of corticosteroid adverse effects. Letermovir also has some inducing effects on other enzymes, making the net effect variable.
What this interaction means in plain words
Dexamethasone-tobramycin and Letermovir can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Dexamethasone-tobramycin belongs to Anti Bacterial; Letermovir belongs to Anti Virals.
Why it happens
Letermovir moderately inhibits CYP3A4, decreasing dexamethasone clearance.
What to do
Monitor for corticosteroid adverse effects such as hyperglycemia and adrenal suppression, and use the lowest effective dexamethasone dose.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Dexamethasone-tobramycin
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-tobramycin with Letermovir?
MediHelp rates the interaction as moderate. Dexamethasone-tobramycin and Letermovir can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Letermovir inhibits CYP3A4 and may increase dexamethasone exposure, raising the risk of corticosteroid adverse effects. Letermovir also has some inducing effects on other enzymes, making the net effect variable.
How serious is the interaction between Dexamethasone-tobramycin and Letermovir?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor for corticosteroid adverse effects such as hyperglycemia and adrenal suppression, and use the lowest effective dexamethasone dose.
What other medicines interact with Dexamethasone-tobramycin?
MediHelp also lists interactions of Dexamethasone-tobramycin with, for example, Capreomycin, Carboplatin, Ciprofloxacin. The full list is on the Dexamethasone-tobramycin page.
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