Aminosalicylic AcidsMesalamineColitis, UlcerativeAminosalicylic AcidSulfapyridineSulfasalazineColitisAnti-Inflammatory Agents, Non-SteroidalEnemaInflammatory Bowel DiseasesPhenylhydrazinesCrohn DiseaseProctitisColonDelayed-Action PreparationsGastrointestinal AgentsAzathioprineSuppositoriesAdministration, Rectal6-MercaptopurineSalicylatesSulfanilamidesTablets, Enteric-CoatedIntestinal MucosaAnti-Inflammatory AgentsAmyloseTabletsAdministration, OralPrednisoloneProctocolectomy, RestorativeIleumIntestinal AbsorptionColitis, IschemicAdrenal Cortex HormonesDextran SulfateRectumAnti-Ulcer AgentsColectomyIntestinesDouble-Blind MethodPouchitisDose-Response Relationship, DrugColitis, CollagenousImmunosuppressive AgentsChemistry, PharmaceuticalIleostomyPatient ComplianceTrinitrobenzenesulfonic AcidTreatment OutcomeColonic PouchesColitis, Microscopic