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