Aminosalicylic AcidsMesalamineAminosalicylic AcidSulfasalazineSulfapyridineAnti-Inflammatory Agents, Non-SteroidalColitis, UlcerativePhenylhydrazinesProctitisEnemaDelayed-Action PreparationsSuppositoriesInflammatory Bowel DiseasesGastrointestinal Agents6-MercaptopurineAzathioprineColonSulfanilamidesAdministration, RectalCrohn DiseaseSalicylatesAnti-Inflammatory AgentsTablets, Enteric-CoatedAmyloseColitisTabletsAdministration, OralChemistry, PharmaceuticalColitis, CollagenousDouble-Blind MethodIntestinal AbsorptionAnti-Ulcer AgentsPrednisoloneDose-Response Relationship, DrugAdrenal Cortex HormonesBinomial DistributionPatient ComplianceIntestinesTreatment OutcomeIleum