Evaluation of LDL Cholesterol in Patients Switched From 10 to 5 Milligrams of Zetia (Ezetimibe)

Inclusion Criteria: * Subjects receiving ezetimibe 10 mg * Subjects who have demonstrated compliance with ezetimibe as evidenced by the following Proportions of Days Covered patterns (which represent a PDC of more than 75%): * 90 day prescriptions: Filled a ezetimibe prescription within the previous 4 months * 60 day prescriptions: Filled a ezetimibe prescription within the previous 2.5 months * 30 day prescriptions: Filled a ezetimibe prescription within the previous 1.5 months * Patients willing and able to provide signed informed consent Exclusion Criteria: * Patients not receiving ezetimibe * Patients receiving ezetimibe 5 milligrams * Patients with a history of being titrated from ezetimibe 5 to 10 mg. Stroke,TIA, myocardial infarction, unstable angina, percutaneous coronary intervention, coronary artery bypass surgery, or major surgery within the 3 months * Cancer undergoing active treatment * Participation in any clinical study within the last 30 days * Drug addiction or alcohol abuse within the past 6 months * Patients unwilling or unable to provide informed consent * Patients with poor compliance * Women of childbearing potential