- Patients receiving azole antifungals (ketoconazole, itraconazole), clarithromycin, erythromycin, diltiazem, verapamil, human immunodeficiency virus (HIV) protease inhibitors (indinavir, saquinavir, ritonavir, atazanavir, nelfinavir) and delavirdine are not eligible unless >= 7 days since last dose before starting sunitinib and no dosing during the trial; patients receiving rifampin, rifabutin, carbamazepine, phenobarbital, phenytoin, St. John's wort, efavirenz and tipranavir are not eligible unless >= 12 days since last dose before starting sunitinib and no dosing during the trial