Increased plasma exposure w/ strong or moderate CYP3A4 inhibitors eg, boceprevir, clarithromycin, cobicistat, indinavir, itraconazole, ketoconazole, nefazodone, nelfinavir, posaconazole, ritonavir, saquinavir, telaprevir, telithromycin, voriconazole, diltiazem, erythromycin, fluconazole, verapamil. Avoid consumption of grapefruit juice. Decreased exposure w/ strong & moderate CYP3A4 inducers eg, carbamazepine, phenobarb, phenytoin, rifampicin, St. John's wort (
Hypericum perforatum), bosentan, efavirenz, etravirine, modafinil, nafcillin. Concomitant use w/ P-gp substrates w/ narrow therapeutic index eg, dabigatran & digoxin; hormonal contraceptives; centrally acting medicinal products & alcohol.