SimvastatinHydroxymethylglutaryl-CoA Reductase InhibitorsAnticholesteremic AgentsLovastatinAzetidinesHypolipidemic AgentsHeptanoic AcidsHypercholesterolemiaPravastatinMevalonic AcidPyrrolesFluorobenzenesCholesterol, LDLCholesterolPolyisoprenyl PhosphatesLipidsNiacinRhabdomyolysisDrug Therapy, CombinationDouble-Blind Method