Drug interactions
Methylprednisolone + Nirmatrelvir / ritonavir
Severity: Major
Methylprednisolone and Nirmatrelvir / ritonavir: major interaction.
Last updated Sources: UK SmPC
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
Ritonavir is a potent CYP3A4 inhibitor and markedly increases methylprednisolone exposure. Extended use may cause Cushing syndrome and adrenal suppression, and even short courses can increase steroid effects.
What this interaction means in plain words
Methylprednisolone and Nirmatrelvir / ritonavir can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Potent CYP3A4 inhibition by ritonavir reduces metabolic clearance of methylprednisolone.
What to do
Avoid long-term combination; use a lower methylprednisolone dose or switch to prednisolone or beclomethasone, and monitor glucose and signs of adrenal suppression.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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References
Other interactions of Methylprednisolone
- Bcg vaccine live + Methylprednisolone Contraindicated
- Measles mumps and rubella vaccine live + Methylprednisolone Contraindicated
- Measles mumps rubella and varicella vaccine live + Methylprednisolone Contraindicated
- Measles vaccine + Methylprednisolone Contraindicated
- Methylprednisolone + Mifepristone Contraindicated
- Methylprednisolone + Rubella vaccine Contraindicated
Frequently asked questions
Can I take Methylprednisolone with Nirmatrelvir / ritonavir?
MediHelp rates the interaction as major. Methylprednisolone and Nirmatrelvir / ritonavir can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Ritonavir is a potent CYP3A4 inhibitor and markedly increases methylprednisolone exposure. Extended use may cause Cushing syndrome and adrenal suppression, and even short courses can increase steroid effects.
How serious is the interaction between Methylprednisolone and Nirmatrelvir / ritonavir?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid long-term combination; use a lower methylprednisolone dose or switch to prednisolone or beclomethasone, and monitor glucose and signs of adrenal suppression.
What other medicines interact with Methylprednisolone?
MediHelp also lists interactions of Methylprednisolone with, for example, Bcg vaccine live, Measles mumps and rubella vaccine live, Measles mumps rubella and varicella vaccine live. The full list is on the Methylprednisolone page.
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