Efficacy and Safety Study of Ezetimibe (SCH 58235, MK-0653) in Addition to Atorvastatin in Participants With Coronary Heart Disease or Multiple Cardiovascular Risk Factors (P00693/MK-0653-030)

The overall objective is to evaluate the efficacy and safety of ezetimibe (SCH 058235/MK-0653) 10 mg administered daily in conjunction with atorvastatin in participants with Heterozygous Familial Hypercholesterolemia (HeFH) or in participants with coronary heart disease (CHD) or multiple cardiovascular risk factors (≥2 risk factors) and primary hypercholesterolemia not controlled by a starting dose (10 mg/day) of atorvastatin. The primary hypothesis is that the coadministration of ezetimibe 10 mg/day with atorvastatin therapy will result in a significantly greater proportion of participants achieving target low-density lipoprotein cholesterol (LDL-C) (≤100 mg/dL) when compared to the atorvastatin administered alone.