Anticoagulants eg, warfarin, antiplatelets eg, aspirin & ticlopidine HCl, thrombolytics eg, urokinase & alteplase, prostaglandin E1 or its derivatives eg, alprostadil & limaprost alfadex; CYP3A4 inhibitors including macrolides eg, erythromycin, HIV PIs eg, ritonavir, azole antimycotics eg, itraconazole & miconazole, cimetidine, diltiazem HCl & grapefruit juice; CYP2C19 inhibitors eg, omeprazole.