Generic Plavix (Clopivas) contains the active ingredient clopidogrel bisulfate. It is used to prevent blood clots and reduce the risk of heart attack, stroke, or vascular death in patients with acute coronary syndrome, recent heart attack or stroke, or peripheral arterial disease. Common side effects include bleeding, though potentially fatal thrombotic thrombocytopenic purpura has also been reported. It works by inhibiting platelet aggregation and is generally taken long-term at a dose of 75mg daily, with higher loading doses for some conditions.