The most common adverse effects therapy with Atorvastatin and other statins are gastrointestinal disturbances. Other adverse effects reported include headache, skin rashes, dizziness, blurred vision, insomnia, and dysgeusia. Reversible increases in serum-aminotransferase concentrations may occur and liver function should be assessed before treatment is initiated and then monitored periodically until one year after last elevation in dose. Hepatitis and pancreatitis have been reported. Hypersensitivity reactions including anaphylaxis and angioedema have also occurred. Myopathy, characterized by myalgia and muscle weakness and associated with increased creatinine phosphokinase concentrations, has been reported, especially in patients taking statins concurrently with cyclosporine fibric acid derivatives, or nicotinic acid. Rarely, rhabdomyolysis with acute renal failure may develop.