Drug interactions
Formoterol-mometasone + Nirmatrelvir / ritonavir
Severity: Moderate
Formoterol-mometasone and Nirmatrelvir / ritonavir: 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
Ritonavir is a potent CYP3A4 inhibitor and, with nirmatrelvir, can substantially raise mometasone exposure. Prolonged coadministration risks Cushing syndrome and adrenal suppression, whereas a short five-day course is usually low risk.
What this interaction means in plain words
Formoterol-mometasone and Nirmatrelvir / ritonavir 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
Strong CYP3A4 inhibition by ritonavir reduces mometasone clearance.
What to do
For short courses continue and watch for steroid excess; if prolonged boosted therapy is needed, switch to beclomethasone or 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 Formoterol-mometasone
Frequently asked questions
Can I take Formoterol-mometasone with Nirmatrelvir / ritonavir?
MediHelp rates the interaction as moderate. Formoterol-mometasone and Nirmatrelvir / ritonavir 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. Ritonavir is a potent CYP3A4 inhibitor and, with nirmatrelvir, can substantially raise mometasone exposure. Prolonged coadministration risks Cushing syndrome and adrenal suppression, whereas a short five-day course is usually low risk.
How serious is the interaction between Formoterol-mometasone and Nirmatrelvir / ritonavir?
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 continue and watch for steroid excess; if prolonged boosted therapy is needed, switch to beclomethasone or prednisolone.
What other medicines interact with Formoterol-mometasone?
MediHelp also lists interactions of Formoterol-mometasone with, for example, Amiodarone, Amisulpride, Amoxapine. The full list is on the Formoterol-mometasone page.
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