- Caution should be used when administering study drugs to patients taking medications significantly metabolized by these enzymes refer to (http://medicine.iupui.edu/clinpharm/ddis/clinical-table/ ) for clinically relevant medications. Particular attention should be paid to patients receiving warfarin. Patient should have coagulation parameters monitored regularly, and warfarin dose adjusted accordingly. If these drugs cannot be discontinued or replaced, enrollment may be allowed after discussion with MSK PI.