Ezetimibe: Decreased mean AUC w/ cholestyramine. Increased mean AUC w/ ciclosporin. Increased total conc w/ fibrates (eg, fenofibrate & gemfibrozil). Reports of increased INR when added to anticoagulants (eg, warfarin or fluindione). Atorvastatin: Increased conc w/ CYP3A4 inhibitors (eg, ciclosporin, telithromycin, clarithromycin, delavirdine, stiripentol, ketoconazole, voriconazole, itraconazole, posaconazole, some antivirals for HCV [eg, elbasvir/grazoprevir], HIV PIs [eg, ritonavir, lopinavir, atazanavir, indinavir, darunavir], erythromycin, diltiazem, verapamil, fluconazole, amiodarone); BCRP inhibitors (eg, elbasvir & grazoprevir). Variable reductions of plasma conc w/ CYP3A4 inducers (eg, efavirenz, rifampicin, St. John's wort). Increased systemic exposure w/ transport protein inhibitors (eg, ciclosporin); boceprevir. Increased risk of muscle-related events, including rhabdomyolysis, w/ fibric acid derivatives (eg, gemfibrozil); ezetimibe; fusidic acid; colchicine; daptomycin. Lower plasma conc w/ colestipol. Slightly increased steady-state digoxin conc. Increased plasma conc of OCs (eg, norethisterone & ethinyl estradiol). Small decrease in prothrombin time w/ warfarin.