Increased plasma conc w/ CYP3A4/5 inhibitors eg, ketoconazole, lopinavir/ritonavir, clarithromycin, indinavir, saquinavir, fosamprenavir; esomeprazole. Decreased plasma conc w/ CYP3A4/5 inducers eg, rifampicin, rifabutin, carbamazepine, phenobarb, phenytoin, St. John's wort, efavirenz, nafcillin, etravirine, aprepitant, prednisone, pioglitazone, high-dose ritonavir (>200 mg bd). Increased plasma conc of CYP3A4/5 (eg, ciclosporin, sirolimus, tacrolimus, prednisone, short-acting opiates, statins, ethinyl oestradiol, norethindrone, midazolam), P-gp (eg, vinca alkaloids, dabigatran etexilate, digoxin, colchicine), BCRP (eg, MTX, daunorubicin, doxorubicin, imatinib, irinotecan, lapatinib, mitoxantrone, topotecan), OCT2 (eg, metformin) & UGT (eg, mycophenolate mofetil) substrates; dextromethorphan. Decreased plasma conc of CYP2B6 (eg, cyclophosphamide, delavirdine, nevirapine, bupropion) & CYP2C8 (eg, repaglinide) substrates; omeprazole.