Anesthetics, DissociativeXylazineAnalgesicsExcitatory Amino Acid AntagonistsAnesthetics, CombinedAnestheticsMidazolamDose-Response Relationship, DrugDouble-Blind MethodThiopentalReceptors, N-Methyl-D-AspartateDepressive Disorder, Treatment-ResistantAnesthesia, IntravenousAnalgesics, OpioidAnesthetics, IntravenousPain, PostoperativeAcepromazineConscious SedationStereoisomerismAdjuvants, AnesthesiaPropofolAnesthesiaMedetomidinePsychoses, Substance-InducedTreatment OutcomeAnalgesiaPain MeasurementPentobarbitalAnesthesia, CaudalMorphineInjections, IntramuscularDrug-Related Side Effects and Adverse ReactionsAnesthesia, GeneralPreanesthetic MedicationDrug Therapy, CombinationFentanylAntidepressive AgentsTime FactorsDrug InteractionsInjections, SpinalAntipsychotic AgentsRats, Sprague-DawleyPain, IntractablePainInfusions, IntravenousAdministration, OralDrug Administration ScheduleTiletamineInjections, IntravenousAnalgesia, EpiduralDrug CombinationsProspective StudiesCross-Over StudiesVomitingAnesthetics, LocalDiazepamMemantineHyperalgesiaNeurotoxicity SyndromesPhencyclidinePlacebosRespirationDrug SynergismAnesthesia, DentalAnalgesia, Patient-ControlledBrainDrug ToleranceAdjuvants, PharmaceuticRats, WistarEtomidateClinical Trials as TopicZolazepamDizocilpine MaleateRandom AllocationDexmedetomidineDisease Models, AnimalDextromethorphanHeart RateAnesthesia Recovery PeriodHallucinogensSchizophreniaBehavior, AnimalAnticonvulsantsN-MethylaspartateNauseaAdministration, RectalBlood PressureBupivacaineAntineoplastic AgentsAnti-Anxiety AgentsElectroencephalographyAmnesia, AnterogradeSurgical Procedures, MinorAnalysis of VariancePiperidinesNitrous OxideRiluzoleBenzodiazepinesLidocaineHalothane