Increased risk of myopathy w/ gemfibrozil, cyclosporine, lopinavir/ritonavir, atazanavir/ritonavir, organic anion transporting polyprotein 1B1 inhibitors, or BCRP inhibitors. May affect INR w/ coumarin anticoagulant. Increased risk of skeletal muscle effects w/ >1 g/day of niacin. Decreased levels or activity of endogenous steroid hormones (eg, ketoconazole, spironolactone, cimetidine), fenofibrates, or PIs in combination w/ ritonavir. Increased levels w/ cyclosporine. Myopathy, including rhabdomyolysis may occur w/ colchicine.