<prompt> Which of the following is not used for thrombo prophylaxisHeparinWarfarinAntithrombin 3Aspirin  <response>: Refer Katzung 10e p 544 Anticoagulants are mainly used for venous thrombosis and are highly effective in treatment and prophylaxis of deep vein thrombosis Warfarin is most commonly used drug in a patient with chronic atrial fibrillation Aspirin and heparin in combination are recommended for unstable angina 