Patients at risk of bleeding from surgery or pathologic processes; thrombocytopenia. Patients w/ unstable angina pectoris, MI, or coronary intervention w/in last 6 mth; history of tachyarrhythmia. Periodically monitor WBC &/or platelet counts in long-term use. Concomitant use w/ antiplatelet or anticoagulants. May affect ability to drive & operate machinery. Severe hepatic & renal impairment. Pregnancy & lactation. Childn. Elderly.