NiacinSimvastatinHydroxymethylglutaryl-CoA Reductase InhibitorsFlushingHypolipidemic AgentsPellagraAnticholesteremic AgentsAzetidinesLovastatinNicotinic AcidsHypercholesterolemiaHeptanoic AcidsDelayed-Action PreparationsNiacinamideCholesterol, LDLVitamin B ComplexPravastatinMevalonic AcidPyrrolesCholesterolVitamin B DeficiencyDyslipidemiasDrug Therapy, CombinationFluorobenzenesLipidsColestipolCholesterol, HDLDose-Response Relationship, DrugPolyisoprenyl PhosphatesDouble-Blind Method