NiacinDelayed-Action PreparationsTablets, Enteric-CoatedOxycodoneChemistry, PharmaceuticalTabletsExcipientsMethylphenidateCyclohexanesSolubilityAdministration, OralDrug CompoundingFlushingAnalgesics, OpioidCross-Over StudiesDose-Response Relationship, DrugPellagraDouble-Blind MethodHypolipidemic Agents