- Currently taking inhibitors/inducers of CYP3A4; (SCH 727965 metabolizes via the CYP3A4 enzyme; there are potential drug interactions with concomitant use of CYP3A4 potent inhibitors/inducers; Principal Investigator should review each case and determine if patients on the CYP3A4 potent inhibitors/inducers are eligible and will make all effort to switch to alternative drugs; patients should not take grapefruit/ grapefruit juice or St. Johns' Wort)