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Analgesics, OpioidNarcoticsOpioid-Related DisordersMorphineNaloxoneEnkephalin, MethionineNarcotic AntagonistsPainReceptors, OpioidOpioid PeptidesOxycodoneEnkephalin, Ala(2)-MePhe(4)-Gly(5)-FentanylReceptors, Opioid, kappaEnkephalinsEndorphinsAnalgesicsPain MeasurementHydromorphoneChronic PainPrescription DrugsReceptors, Opioid, deltaNaltrexoneEnkephalin, D-Penicillamine (2,5)-AlfentanilOxymorphoneAnalgesiaPain, IntractableBuprenorphineDynorphinsEnkephalin, LeucineDrug Tolerancebeta-EndorphinCodeinePrescription Drug MisuseSufentanilMethadoneHydrocodoneBenzeneacetamidesQuestionnairesInjections, SpinalTramadolChronic DiseaseRisk FactorsEnkephalin, Leucine-2-AlanineSubstance-Related DisordersHeroinCross-Sectional StudiesDose-Response Relationship, DrugMorphine DerivativesOpiate AlkaloidsMeperidineUnited StatesTime FactorsPrevalencePain ManagementEtorphineDrug PrescriptionsPyrrolidinesArkansasHypnotics and SedativesNociceptive PainEuphoriaTreatment OutcomeDrug InteractionsPain, PostoperativePeriaqueductal GrayDiprenorphineAnalgesics, Non-NarcoticAnalgesia, EpiduralDrug OverdoseSex FactorsGreat BritainDouble-Blind MethodOpiate Substitution TreatmentPain ThresholdDrug and Narcotic ControlProspective StudiesHyperalgesiaLevorphanolDrug UtilizationRats, Sprague-DawleyAcute PainAnalysis of VarianceHealth Knowledge, Attitudes, PracticeRetrospective StudiesPalliative CareCohort StudiesHealthy People ProgramsPiperidinesQuality of LifeMethadyl AcetateEnglandNalbuphineSubstance Abuse DetectionD-Ala(2),MePhe(4),Met(0)-ol-enkephalinSubstance Withdrawal SyndromeBreakthrough PainBenzodiazepinesHealth Services for the Aged