Which of the following is a common P2Y12 inhibitor used in practice?

Clopidogrel is a widely used P2Y12 inhibitor in clinical practice. It is an antiplatelet medication that functions by irreversibly binding to the P2Y12 receptor on platelets, thereby inhibiting ADP-mediated platelet activation and aggregation. This mechanism is crucial for preventing thrombus formation, particularly in patients at high risk of cardiovascular events, such as those with acute coronary syndromes or those undergoing percutaneous coronary interventions.

In contrast, aspirin primarily acts as a cyclooxygenase inhibitor and works through different pathways to prevent platelet aggregation, making it an antiplatelet agent but not a P2Y12 inhibitor. Warfarin is an anticoagulant that affects the coagulation cascade rather than directly inhibiting platelet function. Enoxaparin is a low molecular weight heparin, which also acts as an anticoagulant through mechanisms unrelated to platelet receptor inhibition. Hence, the clear role of clopidogrel as a P2Y12 inhibitor distinguishes it from the other options listed.