Increased blood conc w/ CYP3A4 or PgP inhibitors (potent: eg, ketoconazole, itraconazole, posaconazole, voriconazole, telithromycin, clarithromycin, nefazodone, ritonavir, atazanavir, saquinavir, darunavir, indinavir, nelfinavir; moderate: eg, erythromycin, imatinib, verapamil, oral ciclosporin, fluconazole, diltiazem, dronedarone, amprenavir, fosamprenavir, grapefruit juice or other foods affecting CYP3A4/PgP). Decreased blood conc w/ potent & moderate CYP3A4 or PgP inducers (eg, rifampicin, dexamethasone, carbamazepine, phenobarb, phenytoin, efavirenz, nevirapine, St. John's Wort). Increased risk of angioedema w/ ACE inhibitors (eg, ramipril). Reduced effectiveness of live vaccines (eg, intranasal flu, measles, mumps, rubella, oral polio, BCG, yellow fever, varicella, & TY21a typhoid vaccines).