Plasma conc & risk of myopathy may be increased w/ CYP3A4 or transport protein inhibitors; other medicinal products w/ potential to induce myopathy eg, fibric acid derivates & ezetimibe. Concomitant use w/ CYP3A4 inhibitors. Variable reductions in plasma conc w/ CYP3A4 inducers eg, efavirenz, rifampin, St. John's wort. Increased systemic exposure w/ transport protein inhibitors eg, ciclosporin. May increase risk of muscle-related events including rhabdomyolysis w/ gemfibrozil/fibric acid derivatives; ezetimibe; systemic fusidic acid. Lowered plasma conc w/ colestipol. Myopathy w/ colchicine. Increased steady-state conc of digoxin. Increased plasma conc of norethindrone & ethinyl oestradiol. Decreased prothrombin time w/ warfarin.