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PainAnalgesicsPain MeasurementPain ManagementAnalgesics, OpioidChronic PainPain, PostoperativePain, IntractablePrescription Drug MisuseChild AbuseArthralgiaMedication ErrorsMedication AdherenceNarcoticsChild Abuse, SexualNeuralgiaPalliative CareTreatment OutcomeOpiate AlkaloidsOpioid-Related DisordersQuestionnairesPain ThresholdProspective StudiesAnti-Inflammatory Agents, Non-SteroidalMorphineNaloxoneLow Back PainBack PainReceptors, OpioidElder AbuseSeverity of Illness IndexSubstance-Related DisordersQuality of LifeComorbidityPatient SatisfactionRetrospective StudiesSubstance Abuse DetectionTime FactorsAbdominal PainNeck PainFollow-Up StudiesMedication ReconciliationMedication SystemsCohort StudiesMedication Systems, HospitalMethadoneNarcotic AntagonistsSpouse AbuseHeroinCodeinePelvic PainAdult Survivors of Child AbusePain PerceptionFacial PainSubstance Abuse Treatment CentersAcute PainPain, ReferredBuprenorphineSubstance Withdrawal SyndromePrescription DrugsEndorphinsMorphine DerivativesEnkephalinsStreet DrugsMarijuana AbuseNaltrexoneOpiumShoulder PainDrug PrescriptionsHeroin DependenceUnited StatesPsychotropic DrugsMusculoskeletal PainSelf MedicationPatient ComplianceEtorphineReceptors, Opioid, muOxycodoneMorphine DependenceAlcoholismAnalgesiaChronic DiseaseDihydromorphinePolypharmacyEnkephalin, Leucine-2-AlanineDrug TherapyCyclazocineRisk FactorsCross-Sectional StudiesEnkephalin, MethionineHydrocodoneEnkephalin, LeucineAntipsychotic AgentsEthylketocyclazocineNonprescription DrugsDouble-Blind MethodCocaine-Related DisordersPrevalenceSelf AdministrationCentral Nervous System Stimulants