Drug interactions
Clopidogrel + Nirmatrelvir / ritonavir
Severity: Moderate
Clopidogrel 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 lowers exposure to clopidogrel's active metabolite, which may weaken platelet inhibition. This matters in patients with recent stents or acute coronary syndromes.
What this interaction means in plain words
Clopidogrel 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
Ritonavir inhibits CYP3A4 and other CYP enzymes involved in clopidogrel bioactivation.
What to do
In high thrombotic risk patients consider a temporary alternative antiplatelet such as ticagrelor, or an alternative COVID-19 therapy. Otherwise monitor for ischemic events during the short course.
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 Clopidogrel
Frequently asked questions
Can I take Clopidogrel with Nirmatrelvir / ritonavir?
MediHelp rates the interaction as moderate. Clopidogrel 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 lowers exposure to clopidogrel's active metabolite, which may weaken platelet inhibition. This matters in patients with recent stents or acute coronary syndromes.
How serious is the interaction between Clopidogrel 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: In high thrombotic risk patients consider a temporary alternative antiplatelet such as ticagrelor, or an alternative COVID-19 therapy. Otherwise monitor for ischemic events during the short course.
What other medicines interact with Clopidogrel?
MediHelp also lists interactions of Clopidogrel with, for example, Ombitasvir / paritaprevir / ritonavir and dasabuvir, Abrocitinib, Acetylsalicylic acid. The full list is on the Clopidogrel page.
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