Comparison of Prasugrel and Clopidogrel in Very Elderly and Non-Elderly Patients With Stable Coronary Artery Disease

Inclusion Criteria: * Participants (Either: at least 45 years of age, but less than 65 years of age OR 75 years of age or older) with a history of stable coronary artery disease who are not currently indicated for treatment with a thienopyridine (that is, prasugrel, clopidogrel, or ticlopidine) * Provision of written informed consent * Body weight greater than or equal to 60 kilograms (kg) * For women of child-bearing potential only (that is, women who are not surgically or chemically sterilised and who are between menarche and 1 year post menopause), test negative for pregnancy (based on a urine or serum pregnancy test to be performed before randomisation) and agree to use a reliable method of birth control during the study Exclusion Criteria: * Unstable coronary artery disease * Myocardial Infarction (MI) within the previous 30 days * Percutaneous Coronary Intervention (PCI) or Coronary Artery Bypass Graft Surgery (CABG) within the previous 90 days * History of refractory ventricular arrhythmias within the last 6 months; an implanted defibrillator device; congestive heart failure within 6 months prior to screening; major surgery, or severe trauma, fracture or organ biopsy within 3 months prior to enrollment * Any planned surgical procedure or any coronary revascularisation (surgical or percutaneous) planned within 60 days following randomisation * Any known contraindication to treatment with an antiplatelet agent * Significant hypertension at the time of screening or randomisation * Clinically significant out-of-range values for platelet count or haemoglobin at screening, in the investigator's opinion, or results of clinical laboratory tests at the time of screening that are judged to be clinically significant for the study population, as determined by the investigator * Prior history or presence of significant bleeding disorders, abnormal bleeding tendency, or personal history of coagulation or bleeding disorders * Prior history or clinical suspicion of cerebral vascular malformations, intracranial neoplasm, Transient Ischemic Attack (TIA) or stroke * Prior history of thrombocytopenia or thrombocytosis * Use of antiplatelet agents (besides aspirin) within 10 days prior to screening; the use (or planned use) of heparin, oral anticoagulants, or fibrinolytic agents within 30 days of screening; or participants receiving daily treatment with nonsteroidal anti-inflammatory drugs (NSAIDS) or cyclooxygenase-2 (COX-2) inhibitors that cannot be discontinued for the duration of the study