Aminosalicylic AcidsMesalamineAminosalicylic AcidSulfapyridineSulfasalazineAnti-Inflammatory Agents, Non-SteroidalColitis, UlcerativeEnemaPhenylhydrazinesInflammatory Bowel DiseasesProctitisDelayed-Action PreparationsBacteriaSuppositoriesAzathioprineGastrointestinal Agents6-MercaptopurineColonSulfanilamidesAdministration, RectalSalicylatesTablets, Enteric-CoatedAmyloseCrohn DiseaseColitisAnti-Inflammatory AgentsTabletsAdministration, OralIntestinal AbsorptionAnti-Ulcer AgentsPrednisoloneChemistry, PharmaceuticalIntestinesAdrenal Cortex HormonesDouble-Blind MethodGram-Negative BacteriaPatient ComplianceIleumGram-Positive BacteriaDose-Response Relationship, Drug