Patients at high risk of CHD (w/ or w/o hyperlipidemia) ie, patients w/ diabetes, history of stroke or other cerebrovascular disease, peripheral vessel disease, or w/ existing CHD to reduce the risk of total mortality, risk of major vascular events (non-fatal MI, CHD death, stroke or revascularization procedures), risk of major coronary events (non-fatal MI or CHD deaths), risk of stroke, the need for coronary revascularization procedures (including CABG & percutaneous transluminal coronary angioplasty), the need for peripheral & other non-coronary revascularization procedures, risk of hospitalization for angina pectoris; reduces the risk of developing peripheral macrovascular complications (peripheral revascularization procedures, lowers limb amputation or, leg ulcers) in DM patients; slows progression of coronary atherosclerosis, including reducing the development of new lesions & total occlusions, in hypercholesterolemic patients w/ CHD. Adjunct to diet to reduce elevated total-C, LDL-C, triglycerides, & apo B, & to increase HDL-C in patients w/ primary hypercholesterolemia including heterozygous familial hypercholesterolemia (Fredrickson type IIa), or combined (mixed) hyperlipidemia (Fredrickson type IIb), when response to diet & other nonpharmacological measures is inadequate; patients w/ hypertriglyceridemia (Fredrickson type IV hyperlipidemia); primary dysbetalipoproteinemia (Fredrickson type III hyperlipidemia); adjunct to diet & other non-dietary measures for the treatment of patients w/ HoFH to reduce elevated total-C, LDL-C & apo B. Adjunct to diet to reduce total-C, LDL-C, triglycerides, & apo B levels in adolescent boys & girls who are at least 1 yr post-menarche, 10-17 yr, w/ heterozygous familial hypercholesterolemia.