Increased exposure & risk of dyspnea, bleeding, & other adverse events w/ strong CYP3A4 inhibitors (eg, ketoconazole, itraconazole, voriconazole, clarithromycin, nefazodone, ritonavir, saquinavir, nelfinavir, indinavir, atazanavir & telithromycin). Reduced exposure & efficacy w/ strong CYP3A inducers (eg, rifampin, phenytoin, carbamazepine & phenobarb). Delayed & reduced absorption w/ opioid agonists. Increased serum conc of simvastatin, lovastatin, & atorvastatin. Inhibits P-gp transporter; monitor digoxin levels w/ initiation of or change in ticagrelor therapy. Increased exposure of ethinyl estradiol.