Drug interactions
Dexamethasone + Nirmatrelvir
Severity: Moderate
Dexamethasone and Nirmatrelvir: 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
Nirmatrelvir inhibits CYP3A4 and may increase systemic dexamethasone exposure. A short course is usually tolerated, but prolonged use raises risk of Cushing syndrome and adrenal suppression.
What this interaction means in plain words
Dexamethasone and Nirmatrelvir 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 belongs to Endocrine; Nirmatrelvir belongs to Anti Virals.
Why it happens
Nirmatrelvir inhibits CYP3A4, reducing dexamethasone clearance.
What to do
For short courses, monitor for steroid adverse effects such as hyperglycemia. For prolonged therapy, consider an alternative corticosteroid less dependent on CYP3A4, such as prednisolone.
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
Other interactions of Nirmatrelvir
- Alfuzosin + Nirmatrelvir Contraindicated
- Amiodarone + Nirmatrelvir Contraindicated
- Apalutamide + Nirmatrelvir Contraindicated
- Carbamazepine + Nirmatrelvir Contraindicated
- Colchicine + Nirmatrelvir Contraindicated
- Dronedarone + Nirmatrelvir Contraindicated
Frequently asked questions
Can I take Dexamethasone with Nirmatrelvir?
MediHelp rates the interaction as moderate. Dexamethasone and Nirmatrelvir 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. Nirmatrelvir inhibits CYP3A4 and may increase systemic dexamethasone exposure. A short course is usually tolerated, but prolonged use raises risk of Cushing syndrome and adrenal suppression.
How serious is the interaction between Dexamethasone and Nirmatrelvir?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: For short courses, monitor for steroid adverse effects such as hyperglycemia. For prolonged therapy, consider an alternative corticosteroid less dependent on CYP3A4, such as prednisolone.
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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