Variability of response to clopidogrel: possible mechanisms and clinical implications

Cardiology in Review
Theresa NguyenRobert G Lerner

Abstract

Clopidogrel has been shown to inhibit adenosine diphosphate-induced platelet aggregation and has been demonstrated to be effective in reducing the risk of arterial thrombotic events in several large clinical studies. However, the clinical benefit could be attenuated by the variability of response to the antiplatelet effects of clopidogrel in as many as 30% of patients. Multiple mechanisms likely contribute to clopidogrel variability of response, including inappropriate dosing or underdosing of clopidogrel, drug-drug interactions, and genetic polymorphisms. The best laboratory procedure to screen for possible clopidogrel variability of response remains to be determined.

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