6. CYP3A4 inhibitors. Dasatinib is primarily metabolized by the CYP3A4 enzyme. Therefore, potent inhibitors of CYP3A4 may increase dasatinib plasma concentrations: (i) ketoconazole, itraconazole, erythromycin, clarithromycin,ritonavir, atazanavir, indinavir, nefazodone, nelfinavir, saquinavir; (ii) telithromycin; and (iii) subjects should be advised not to consume substantial quantities of grapefruit juice.