Aminosalicylic AcidsMesalamineAminosalicylic AcidSulfapyridineSulfasalazineAnti-Inflammatory Agents, Non-SteroidalColitis, UlcerativeEnemaPhenylhydrazinesInflammatory Bowel DiseasesProctitisDelayed-Action PreparationsSuppositoriesAzathioprineGastrointestinal Agents6-MercaptopurineSulfanilamidesColonAdministration, RectalSalicylatesTablets, Enteric-CoatedAmyloseCrohn DiseaseColitisAnti-Inflammatory AgentsTabletsAdministration, OralIntestinal AbsorptionAnti-Ulcer AgentsPrednisoloneChemistry, PharmaceuticalAdrenal Cortex HormonesDouble-Blind MethodDose-Response Relationship, DrugIntestinesPatient ComplianceIleum