Drug interactions
clopidogrel + warfarin
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.
Overview
Combined anticoagulant and antiplatelet therapy increases risk of serious bleeding (e.g., GI, intracranial).
Mechanism of action
Pharmacodynamic: additive effects—warfarin reduces clotting factors; clopidogrel irreversibly inhibits P2Y12-mediated platelet aggregation.
Clinical management
Avoid unless clear indication (e.g., AF with recent stent). If combined, use lowest effective intensity; monitor for bleeding, Hgb/Hct; maintain therapeutic INR but recognize bleeding risk is increased regardless of INR.
Drug reference
References
- Plavix (clopidogrel) Prescribing Information — FDA Label
- Warfarin Sodium Tablets Prescribing Information — FDA Label
- Warfarin + Clopidogrel Drug Interaction Monograph — Lexicomp
Frequently asked questions
Can I take clopidogrel with warfarin?
The interaction is rated: Major. Combined anticoagulant and antiplatelet therapy increases risk of serious bleeding (e.g., GI, intracranial).
How serious is the interaction between clopidogrel and warfarin?
The interaction is rated: Major. Evidence level: High.
How is the interaction between clopidogrel and warfarin managed?
Avoid unless clear indication (e.g., AF with recent stent). If combined, use lowest effective intensity; monitor for bleeding, Hgb/Hct; maintain therapeutic INR but recognize bleeding risk is increased regardless of INR.
Why do clopidogrel and warfarin interact?
Pharmacodynamic: additive effects—warfarin reduces clotting factors; clopidogrel irreversibly inhibits P2Y12-mediated platelet aggregation.
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