Drug interactions
Dexamethasone-tobramycin + Fosamprenavir
Severity: Moderate
Dexamethasone-tobramycin and Fosamprenavir: 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
Amprenavir (from fosamprenavir) inhibits CYP3A4 and may raise dexamethasone exposure, while dexamethasone induction may lower amprenavir levels. This matters mainly with systemic dexamethasone.
What this interaction means in plain words
Dexamethasone-tobramycin and Fosamprenavir 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.
Why it happens
Bidirectional CYP3A4 effects: inhibition by amprenavir, induction by dexamethasone.
What to do
Monitor HIV viral load and signs of corticosteroid excess with systemic dexamethasone. Consider dose reduction or an alternative corticosteroid for long courses.
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
Frequently asked questions
Can I take Dexamethasone-tobramycin with Fosamprenavir?
MediHelp rates the interaction as moderate. Dexamethasone-tobramycin and Fosamprenavir 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. Amprenavir (from fosamprenavir) inhibits CYP3A4 and may raise dexamethasone exposure, while dexamethasone induction may lower amprenavir levels. This matters mainly with systemic dexamethasone.
How serious is the interaction between Dexamethasone-tobramycin and Fosamprenavir?
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 HIV viral load and signs of corticosteroid excess with systemic dexamethasone. Consider dose reduction or an alternative corticosteroid for long courses.
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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