Drug interactions
Nirmatrelvir / ritonavir + Triamcinolone
Severity: Major
Nirmatrelvir / ritonavir and Triamcinolone: major 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
Ritonavir is a strong CYP3A4 inhibitor and can markedly raise triamcinolone exposure, with Cushing syndrome and adrenal suppression reported. For a short nirmatrelvir course the effect of a depot triamcinolone injection may persist for weeks.
What this interaction means in plain words
Nirmatrelvir / ritonavir and Triamcinolone 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
Ritonavir inhibits CYP3A4, decreasing triamcinolone clearance.
What to do
Avoid combining where possible and consider alternative corticosteroids such as prednisolone or beclomethasone. If recent triamcinolone injection was given, monitor for Cushingoid signs and adrenal insufficiency.
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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Other interactions of Triamcinolone
- Smallpox vaccine live + Triamcinolone Contraindicated
- Triamcinolone + Zoster vaccine live Contraindicated
- Adenovirus types 4 and 7 live + Triamcinolone Major
- Aldesleukin + Triamcinolone Major
- Atazanavir + Triamcinolone Major
- Axicabtagene ciloleucel + Triamcinolone Major
Frequently asked questions
Can I take Nirmatrelvir / ritonavir with Triamcinolone?
MediHelp rates the interaction as major. Nirmatrelvir / ritonavir and Triamcinolone 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 strong CYP3A4 inhibitor and can markedly raise triamcinolone exposure, with Cushing syndrome and adrenal suppression reported. For a short nirmatrelvir course the effect of a depot triamcinolone injection may persist for weeks.
How serious is the interaction between Nirmatrelvir / ritonavir and Triamcinolone?
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 combining where possible and consider alternative corticosteroids such as prednisolone or beclomethasone. If recent triamcinolone injection was given, monitor for Cushingoid signs and adrenal insufficiency.
What other medicines interact with Triamcinolone?
MediHelp also lists interactions of Triamcinolone with, for example, Smallpox vaccine live, Zoster vaccine live, Adenovirus types 4 and 7 live. The full list is on the Triamcinolone page.
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