- Received Cytochrome P450 3A (CYP3A) inhibitors (such as fluconazole, ketoconazole, voriconazole, and clarithromycin) within 3 days of starting venetoclax; received strong CYP3A inducers (such as rifampin, rifabutin, phenytoin, carbamazepine, and St. John's Wort) within 3 days of starting venetoclax