Anesthetics, DissociativeSubstance-Related DisordersCocaine-Related DisordersXylazineAnalgesicsAmphetamine-Related DisordersHeroin DependenceHeroinExcitatory Amino Acid AntagonistsMethamphetamineAnesthetics, CombinedOpioid-Related DisordersAnestheticsDrug UsersMidazolamSubstance Abuse DetectionThiopentalSubstance Abuse, IntravenousReceptors, N-Methyl-D-AspartateAlcoholismDepressive Disorder, Treatment-ResistantNarcoticsAnalgesics, OpioidOxycodoneStreet DrugsBuprenorphineAcepromazineOpiumDose-Response Relationship, DrugAnesthesia, IntravenousAnesthetics, IntravenousCocaineEuphoriaConscious SedationSubstance Abuse Treatment CentersPropofolAnesthesiaStereoisomerismMedetomidineAdjuvants, AnesthesiaHallucinogensPentobarbitalAnesthesia, CaudalDouble-Blind MethodMorphineHydromorphoneCrack CocainePsychoses, Substance-InducedMMPIDynamin IIIInjections, IntravenousMethadoneCodeineAnesthesia, GeneralPreanesthetic MedicationBrainToken EconomyAntitussive AgentsNarcotic AntagonistsPain, PostoperativeDiagnosis, Dual (Psychiatry)HydrocodoneTiletamineAmphetaminesAnalgesiaInjections, IntramuscularMethylphenidateCentral Nervous System StimulantsHemopneumothoraxTime FactorsRats, Sprague-DawleyDenial (Psychology)PupilN-Methyl-3,4-methylenedioxyamphetaminePseudoephedrineAntidepressive AgentsTherapeutic CommunityCloxacillinCannabisPain, IntractableGas Chromatography-Mass SpectrometryPain MeasurementFentanylDrug InteractionsZolazepamBehavior, AddictiveDrug Administration RoutesDrug CombinationsReinforcement (Psychology)PhencyclidineRacloprideNalbuphineSubstance Withdrawal SyndromeAnalysis of VariancePrefrontal CortexOxymorphoneHeart RateMemantineInjections, SpinalAcquired Immunodeficiency Syndrome