Efficacy and Safety Study of Pitavastatin Versus Atorvastatin to Treat Hypercholesterolemia

Inclusion Criteria: * Patients aged between 25 and 75 * Patients who signed informed consent forms of their own volition; * Patients who had taken statins for 2 months and longer or whose fasting LDL-C levels, were 130mg/dL and over (Friedewald's formula); * Patients whose ALT levels were 1.25 to 2.5 times higher than the upper limit of normal Exclusion Criteria: * Patients with uncompensated liver cirrhosis. * Patients whose total bilirubin levels were over 2 times higher than the upper limit of normal. * Patients who had taken antiviral drugs for viral hepatitis. * Patients who experienced cerebrovascular diseases or myocardial infarction within 3 months before screening visit or patients with heart failure (NYHA class IV). * Patients whose triglyceride(TG) levels were 400mg/dL or higher. * Patients with uncontrolled hypertension (DBP≧100mmHg) * Patients under suspicion of renal dysfunction (serum creatinine≧2.0mg/dL) * Patients whose CK levels were over 2.5 times higher than the upper limit of normal. * Patients with uncontrolled hypothyroidism although drug treatment (TSH≧ULN×1.5) * Female patients who were nursing or being pregnant or were planning on becoming pregnant. * Patients judged to be unsuitable by investigators.