Concurrent use of warfarin Patients taking warfarin are not eligible; patients on therapeutic doses of anticoagulants are excluded from study Requires the use of warfarin (because of potential drug-drug interactions that may potentially increase the exposure of warfarin) Use of full dose, therapeutic anti-coagulation with warfarin Patients requiring the use of warfarin are excluded Concurrent use of warfarin Requires the use of warfarin (because of potential drug-drug interactions that may potentially increase the exposure of warfarin) Concurrent use of warfarin Concomitant treatment with therapeutic anticoagulants such as warfarin Requires the use of warfarin, marcumar, or phenprocoumon Warfarin use is provisionally allowed Current use of therapeutic anticoagulants such as warfarin or heparin Concurrent use of therapeutic warfarin is allowed. However, anticoagulants that do not have reversal agents available are prohibited. Use of warfarin, metronidazole or ornidazole for therapeutic use Concurrent use of therapeutic warfarin Any condition requiring warfarin or thrombolytic anticoagulants Concurrent use of therapeutic warfarin Requires the use of warfarin Concurrent use of therapeutic warfarin Concurrent use of therapeutic warfarin Current use of therapeutic warfarin. Any condition requiring full-dose anticoagulants, such as warfarin, heparin, or thrombolytic agents Current use of warfarin or other anticoagulants Use of Warfarin Current use of American ginseng, ramelteon, or warfarin Use of antibiotics, antiplatelets (e.g. clopidogrel), or anticoagulants (e.g. warfarin) within the last 3 months No use of full dose, therapeutic anti-coagulation; however, low dose warfarin for catheter prophylaxis or acetylsalicylic acid are acceptable Any condition requiring warfarin or thrombolytic anticoagulants