Strong CYP3A4 inhibitors (clarithromycin, erythromycin, ketoconazole/itraconazole, ritonavir and other protease inhibitors), grapefruit juice, cyclosporine, gemfibrozil and other fibrates, niacin (high doses), colchicine, warfarin (monitor INR), digoxin, amiodarone/verapamil/diltiazem (may increase atorvastatin levels)