Aminosalicylic AcidsMesalamineAminosalicylic AcidSulfapyridineSulfasalazineAnti-Inflammatory Agents, Non-SteroidalColitis, UlcerativeEnemaPhenylhydrazinesInflammatory Bowel DiseasesProctitisDelayed-Action PreparationsSuppositoriesAzathioprineGastrointestinal Agents6-MercaptopurineSulfanilamidesColonAdministration, RectalSalicylatesTablets, Enteric-CoatedAmyloseCrohn DiseaseColitisTabletsAnti-Inflammatory AgentsAdministration, OralIntestinal AbsorptionAnti-Ulcer AgentsPrednisoloneChemistry, PharmaceuticalDouble-Blind MethodAdrenal Cortex HormonesDose-Response Relationship, DrugPatient ComplianceIntestinesIleumImmunosuppressive Agents