Clopidogrel is an antiplatelet drug used in the treatment of conditions where there is a likelihood of thrombosis. Patients who have recently suffered a heart attack and who, as a consequence, received a stent in their coronary artery, would be the type of candidate to receive clopidogrel. This drug is also used as a prophylaxis against conditions such as heart attack, stroke, and peripheral vascular disease. The drug is generally well tolerated. The drug works as a P2Y12 inhibitor. P2Y12 is a sub-type of the ADP receptor, and it's this latter receptor that is found on the surface of platelets. Thus, by blocking P2Y12, clopidogrel serves to prevent platelet activation, aggregation, and clot formation. As a result, it prevents thrombus formation.