BuprenorphineMethadoneOpioid-Related DisordersOpiate Substitution TreatmentNarcoticsNarcotic AntagonistsHeroin DependenceAnalgesics, OpioidMethadyl AcetateNaloxoneNeonatal Abstinence SyndromeAdministration, SublingualHeroinMorphinansSubstance Abuse DetectionSubstance Withdrawal SyndromeNaltrexoneMorphineReceptors, Opioid, muReceptors, OpioidStreet DrugsSubstance-Related DisordersOpiate AlkaloidsDose-Response Relationship, DrugPrescription Drug DiversionDrug OverdoseSubstance Abuse, IntravenousMeconiumDrug InteractionsHydromorphonePyrrolidinesLevorphanolCodeineCocaine-Related DisordersDrug and Narcotic ControlOpiumPrescription Drug MisuseDiprenorphineAnalgesicsPupilPrisonersThiazinesAnalgesiaPainTramadolNalbuphineDextropropoxypheneOxidoreductases, N-DemethylatingCocainePain MeasurementTreatment OutcomeDrug CombinationsSubstance Abuse Treatment CentersDouble-Blind MethodDrug UsersCyclazocineDirectly Observed TherapyPain, IntractableFentanyl