Da trabectedin hovedsagelig metaboliseres ved CYP 3A4, kunne samtidig administration af stoffer, der hæmmer dette isoenzym, f. eks. ketoconazol, fluconazol, ritonavir eller clarithromycin nedsætte metaboliseringen og øge trabectedin - koncentrationerne.
Since trabectedin is metabolised mainly by CYP3A4, co-administration of substances that inhibit this isoenzyme e. g. ketoconazole, fluconazole ritonavir or clarithromycin could decrease metabolism and increase trabectedin concentrations.