Increased C
max & AUC w/ potent & a moderate CYP3A4 inhibitor. Reduced plasma conc w/ ritonavir. Lower mean C
max, delayed T
max & higher AUC w/ proton pump inhibitors. Reduced plasma conc w/ CYP3A4 inducers (eg, rifampicin, phenytoin, phenobarb, carbamazepine, efavirenz, fosphenytoin, nevirapine, oxcarbazepine, primidone, rifabutine, St. John's wort). Reduced contraceptive action of combined hormonal contraceptives & progestogen-only contraception.