Drug interactions
Nirmatrelvir + Prednisone
Severity: Moderate
Nirmatrelvir and Prednisone: moderate interaction.
Last updated Sources: US FDA label
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 is given with ritonavir, which strongly inhibits CYP3A4 and can raise corticosteroid exposure. For short Paxlovid courses with prednisone, the effect is usually modest, but prolonged use raises Cushing syndrome and adrenal suppression risk.
What this interaction means in plain words
Nirmatrelvir and Prednisone 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 belongs to Anti Virals; Prednisone belongs to Endocrine.
Why it happens
Ritonavir-mediated CYP3A4 inhibition reduces prednisolone clearance.
What to do
For a 5-day course, usually continue prednisone and monitor for steroid adverse effects such as hyperglycemia. For long-term steroid use, consider prednisolone or beclomethasone alternatives.
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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References
- Paxlovid - FDA drug label (DailyMed) — openFDA / DailyMed
Other interactions of Prednisone
- Bcg vaccine live + Prednisone Contraindicated
- Measles vaccine + Prednisone Contraindicated
- Mifepristone + Prednisone Contraindicated
- Prednisone + Radium-223 dichloride Contraindicated
- Prednisone + Smallpox vaccine live Contraindicated
- Adenovirus types 4 and 7 live + Prednisone Major
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 Nirmatrelvir with Prednisone?
MediHelp rates the interaction as moderate. Nirmatrelvir and Prednisone 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 is given with ritonavir, which strongly inhibits CYP3A4 and can raise corticosteroid exposure. For short Paxlovid courses with prednisone, the effect is usually modest, but prolonged use raises Cushing syndrome and adrenal suppression risk.
How serious is the interaction between Nirmatrelvir and Prednisone?
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 a 5-day course, usually continue prednisone and monitor for steroid adverse effects such as hyperglycemia. For long-term steroid use, consider prednisolone or beclomethasone alternatives.
What other medicines interact with Prednisone?
MediHelp also lists interactions of Prednisone with, for example, Bcg vaccine live, Measles vaccine, Mifepristone. The full list is on the Prednisone page.
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