Stoffer der hæmmer cytochrom P450 isoenzym CYP3A4- aktivitet (f. eks. ketoconazol, itraconazol, erythromycin, clarithromycin) kan nedsætte metabolismen og øge koncentrationen af imatinib.
Substances that inhibit the cytochrome P450 isoenzyme CYP3A4 activity (e. g. ketoconazole, itraconazole, erythromycin, clarithromycin) could decrease metabolism and increase imatinib concentrations.