Drug interactions
Nirmatrelvir / ritonavir + Rivaroxaban
Severity: Major
Nirmatrelvir / ritonavir and Rivaroxaban: 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-boosted nirmatrelvir strongly inhibits CYP3A4 and P-gp, increasing rivaroxaban exposure. Bleeding risk is increased.
What this interaction means in plain words
Nirmatrelvir / ritonavir and Rivaroxaban 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
Combined strong CYP3A4 and P-gp inhibition reducing rivaroxaban clearance.
What to do
Avoid if possible; consider alternative COVID-19 therapy or a temporary anticoagulant switch, and monitor for bleeding.
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 Rivaroxaban
- Defibrotide + Rivaroxaban Contraindicated
- Ketoconazole + Rivaroxaban Contraindicated
- Ketorolac + Rivaroxaban Contraindicated
- Abciximab + Rivaroxaban Major
- Acalabrutinib + Rivaroxaban Major
- Acetylsalicylic acid + Rivaroxaban Major
Frequently asked questions
Can I take Nirmatrelvir / ritonavir with Rivaroxaban?
MediHelp rates the interaction as major. Nirmatrelvir / ritonavir and Rivaroxaban 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-boosted nirmatrelvir strongly inhibits CYP3A4 and P-gp, increasing rivaroxaban exposure. Bleeding risk is increased.
How serious is the interaction between Nirmatrelvir / ritonavir and Rivaroxaban?
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 if possible; consider alternative COVID-19 therapy or a temporary anticoagulant switch, and monitor for bleeding.
What other medicines interact with Rivaroxaban?
MediHelp also lists interactions of Rivaroxaban with, for example, Defibrotide, Ketoconazole, Ketorolac. The full list is on the Rivaroxaban page.
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