Decrease elevated total cholesterol (total-C), LDL-cholesterol (LDL-C) & triglycerides (TG); increase high density lipoprotein cholesterol (HDL-C) in adult patients w/ primary hypercholesterolemia (heterozygous familial & nonfamilial) or mixed dyslipidemia (Fredrickson types IIa & IIb). Decrease Apo B, non-HDL-C, VLDL-C, VLDL-TG, LDL-C/HDL-C, total-C/HDL-C, non-HDL-C/HDL-C & Apo B/Apo A-I ratios & increase Apo A-I. Decrease total-C, LDL-C & Apo B levels in adolescent boys & girls (who are at least 1 yr post-menarche), 10-17 yr w/ heterozygous familial hypercholesterolemia if after an adequate trial of diet therapy, the following are present: LDL-C >190 mg/dL or LDL-C >160 mg/dL & +ve family history of premature CV disease or ≥2 other CV risk factors are present. Treatment of isolated hypertriglyceridemia (Fredrickson type IV hyperlipidemia) & primary dysbetalipoproteinemia (Fredrickson type III hyperlipoproteinemia). Decrease total-C & LDL-C in patients w/ homozygous familial hypercholesterolemia as adjunct to other lipid-lowering treatments (eg, LDL apheresis) or alone if such treatments are unavailable. Slow progression of CV disease. Primary prevention of CV disease.