Discontinue therapy in patient w/ markedly elevated CPK levels (>10x ULN) or if myopathy is suspected/diagnosed; suspected immune-mediated necrotizing myopathy; myalgia at calf, back or whole body; transaminase level >3x ULN. Interrupt therapy if hepatic failure has been reported. Temporarily withhold therapy in patients experiencing conditions predisposing to development of renal failure secondary to rhabdomyolysis (eg, sepsis, hypotension, major surgery, trauma, uncontrolled epilepsy, severe metabolic, endocrine, or electrolyte disorders). Increased risk of rhabdomyolysis w/ high dose, elderly, hepatic or renal insufficiency, alcoholism & hypothyroidism; blood sugar level. Evaluate patients w/ signs & symptoms of endocrine dysfunction. Liver function abnormalities; rhabdomyolysis w/ acute renal failure secondary to myoglobinuria. Unexplained muscle pain, tenderness, weakness or brown urine. Patients w/ recent (<6 mth) hepatic disease, history of hepatic disease, signs of suspected hepatic disease (unexplained aminotransferase elevations, jaundice), or are heavy alcohol users; inadequately treated hypothyroidism & those taking other drugs associated w/ myopathy eg, colchicine; pre-existing amyotrophic lateral sclerosis. Perform LFTs at baseline; before, 6 & 12 wk after taking the drug; every 6 mth for patients routinely using the drug. Concomitant use w/ medication that may reduce steroid hormone levels/activity (eg, spironolactone, cimetidine, ketoconazole); digoxin, warfarin. Increased risk of myopathy/rhabdomyolysis w/ azole antifungals (eg, ketoconazole, itraconazole), macrolides (eg, erythromycin, clarithromycin), HIV PIs (eg, indinavir, ritonavir, nelfinavir, saquinavir), verapamil, diltiazem, gemfibrozil, nicotinic acid, cyclosporine, amiodarone, colchicine; dose-related risk of rhabdomyolysis w/ concurrent use of erythromycin, cyclosporine, fibric acid derivatives (eg, gemfibrozil) or niacin (doses ≥1 g daily). Adequate contraception is recommended in females of reproductive potential. Discontinue treatment immediately if unplanned pregnancy occurs during treatment; in females planning pregnancy 1-2 mth prior to attempting to conceive. Not recommended in childn <18 yr. Elderly.