AnalgesicsStructure-Activity RelationshipInhibitory Concentration 50Analgesics, OpioidDrug Screening Assays, AntitumorMolecular StructureDrug DesignAnalgesics, Non-NarcoticSmall Molecule LibrariesDrug Evaluation, PreclinicalStereoisomerismIndolesDose-Response Relationship, DrugEnzyme InhibitorsAnalgesiaAntineoplastic AgentsCell Line, TumorPainPain MeasurementModels, MolecularMorphineAntiviral AgentsPain, PostoperativeMicrobial Sensitivity TestsCrystallography, X-RayTramadolCell SurvivalKineticsCell LineCell ProliferationProtein BindingPhenacetinAcetaminophenDextropropoxypheneAnti-Inflammatory Agents, Non-SteroidalDrug ToleranceCodeinePain ThresholdPlant ExtractsMeperidineFentanylPentazocineReceptors, Opioid, muAnesthetics, LocalHyperalgesiaOxycodonePain ManagementSulfur CompoundsDipyroneInjections, SpinalVolatile Organic CompoundsBupivacaineNaloxoneAnalgesia, EpiduralCarrageenanDouble-Blind MethodKetoprofenAnalgesia, Patient-ControlledReceptors, OpioidKidney Papillary NecrosisNarcotic AntagonistsTolmetinIbuprofenHydrocodoneNefopamKetorolacNeuralgiaRats, Sprague-DawleyNociceptionPain, IntractableEdemaHydromorphoneCyclohexanecarboxylic AcidsNalorphineAminesPhenolsBuprenorphineAcupuncture AnalgesiaMagnetic Resonance SpectroscopyDiclofenacNociceptorsMorphinansAnti-Inflammatory AgentsMorphine DerivativesAmidesAcetic AcidTime FactorsSpiro CompoundsAnalgesia, ObstetricalButorphanolHypnotics and SedativesHeterocyclic CompoundsChromatography, High Pressure LiquidBiphenyl CompoundsOxymorphoneSulfhydryl CompoundsNarcoticsMeptazinolNociceptive PainOrganotin Compounds