Drug interactions
Dexamethasone + Fosamprenavir
Severity: Moderate
Dexamethasone 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 (the active form of fosamprenavir) may raise dexamethasone exposure, while dexamethasone may lower amprenavir concentrations. This may increase steroid effects and risk loss of antiretroviral efficacy.
What this interaction means in plain words
Dexamethasone 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
Amprenavir inhibits CYP3A4 while dexamethasone induces CYP3A4, producing opposing bidirectional effects on metabolism.
What to do
Monitor HIV viral response and steroid adverse effects; consider an alternative corticosteroid or limit the duration of dexamethasone, and adjust doses as needed.
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
- Bcg vaccine live + Dexamethasone Contraindicated
- Dexamethasone + Mifepristone Contraindicated
- Dexamethasone + Rilpivirine Contraindicated
- Dexamethasone + Smallpox vaccine live Contraindicated
- Dexamethasone + Varicella virus vaccine live Contraindicated
- Dexamethasone + Yellow fever vaccine Contraindicated
Frequently asked questions
Can I take Dexamethasone with Fosamprenavir?
MediHelp rates the interaction as moderate. Dexamethasone 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 (the active form of fosamprenavir) may raise dexamethasone exposure, while dexamethasone may lower amprenavir concentrations. This may increase steroid effects and risk loss of antiretroviral efficacy.
How serious is the interaction between Dexamethasone 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 response and steroid adverse effects; consider an alternative corticosteroid or limit the duration of dexamethasone, and adjust doses as needed.
What other medicines interact with Dexamethasone?
MediHelp also lists interactions of Dexamethasone with, for example, Bcg vaccine live, Mifepristone, Rilpivirine. The full list is on the Dexamethasone page.
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