Coadministration of Ezetimibe and Atorvastatin in Patients With Primary Hypercholesterolemia (P05456)

Inclusion Criteria: * Participants with hypercholesterolemia who satisfy the following criteria: * Participants who have used any of the following 3-hydroxy-3-methylglutaryl-coenzyme A (HMG-CoA) reductase inhibitors (hereinafter referred to as "statins") for 4 weeks or longer before the start of the observation period and whose low density lipoprotein (LDL)-cholesterol level during the treatment had not reached lipid management target * Age: 20 years of age or older (at the time of obtaining informed consent) * Sex: both males and females * Inpatient/outpatient: Out-patient Exclusion Criteria: * Participants for whom any of the following is applicable: * Participants whose fasted triglyceride level measured at the start of the observation period or the treatment period exceeds 500 mg/dL * Participants with homozygous familial hypercholesterolemia * Participants with creatine phosphokinase (CPK) \> 2x upper limit of normal (ULN) measured at the start of the observation period or the treatment period. * Participants with serious hepatic disorder, or participants with alanine aminotransferase (ALT) or aspartate aminotransferase (AST) \> 2x ULN measured at the start of the observation period or the treatment period. * Participants with a history of hypersensitivity to any ingredient of ezetimibe tablets or atorvastatin tablets * Pregnant, nursing women, women who may be pregnant, or participants wishing to be pregnant during the study. * Participants who have discontinued use of serum lipid lowering agents for less than 4 weeks at the start of the treatment period (8 weeks in the case of probucol). (However, if the participant had taken a serum lipid lowering agent before the test conducted at the start of the observation period, a period of discontinuation of 27 days, or 55 days in the case of probucol, is allowed.) * Participants who are using cyclosporine from after the start of the observation period * Participants with a history of ezetimibe use * Participants with hyperlipidemia associated with the following diseases: * Hypothyroidism * Obstructive gall bladder or biliary disease * Chronic renal failure * Pancreatitis * Participants with hyperlipidemia associated with concomitant use of drugs having adverse effect on serum lipids, etc * Participants who have received an investigational drug within 4 weeks of the start of the observation period * Other participants deemed not appropriate for study entry by the investigator