Amlodipine besilate: Increased systemic exposure w/ diltiazem. May increase plasma conc w/ strong CYP3A4 inhibitors (eg, ketoconazole, itraconazole, ritonavir). Increased risk of hypotension w/ clarithromycin. May lower plasma conc w/ CYP3A4 inducers (eg, rifampicin,
Hypericum perforatum). Increased bioavailability w/ grapefruit or grapefruit juice. May affect trough conc of cyclosporine in renal transplant patients. Increased risk of tacrolimus blood levels. May increase exposure of mTOR inhibitors (eg, sirolimus, temsirolimus, & everolimus). Atorvastatin Ca: Increased risk of myopathy w/ cyclosporine, fibric acid derivatives, lipid-modifying doses of niacin or CYP450 3A4/transporter inhibitors (eg, erythromycin & azole antifungals). Increased plasma conc w/ CYP450 3A4 inhibitors; erythromycin/clarithromycin; PIs; diltiazem; grapefruit juice. Increased AUC w/ itraconazole. Increased exposure w/ cyclosporine; glecaprevir, pibrentasvir; letermovir, elbasvir, grazoprevir. Reduced plasma conc w/ CYP450 3A4 inducers (eg, efavirenz, rifampin); oral antacid susp containing Mg & Al hydroxides; colestipol. Increased digoxin conc. Increased AUC of OCs containing norethindrone & ethinyl estradiol. Increased risk of rhabdomyolysis w/ fusidic acid. Myopathy w/ colchicine.