NalorphineLevorphanolPentazocineNarcotic AntagonistsLevallorphanNaloxoneCyclazocineNarcoticsMorphineDrug and Narcotic ControlMeperidineAnalgesics, OpioidMorphinansOpiumAlphaprodineHormone AntagonistsLegislation, DrugDextropropoxypheneAnalgesicsDopamine AntagonistsExcitatory Amino Acid AntagonistsNeurokinin-1 Receptor AntagonistsOpioid-Related DisordersFentanylDose-Response Relationship, DrugMethadoneOxymorphoneHistamine H2 AntagonistsInterleukin 1 Receptor Antagonist ProteinHeroinCodeineMuscarinic AntagonistsGABA AntagonistsPain, PostoperativeHistamine H1 AntagonistsPurinergic P1 Receptor AntagonistsPreanesthetic MedicationPiperidinesRats, Sprague-DawleyHistamine AntagonistsNicotinic AntagonistsAdenosine A2 Receptor AntagonistsAdrenergic alpha-1 Receptor AntagonistsNaltrexonePurinergic P2 Receptor AntagonistsSpasmHydrocodonePainInert Gas NarcosisSerotonin 5-HT3 Receptor AntagonistsSubstance-Related DisordersReceptors, OpioidSerotonin 5-HT2 Receptor AntagonistsDibenzocycloheptenesAlcoholics AnonymousAdenosine A1 Receptor AntagonistsOxycodoneDrug ToleranceLeukotriene AntagonistsAngiotensin Receptor AntagonistsReceptors, Opioid, muMorphine DependenceAnalgesiaAnesthesiaIsonipecotic AcidsSubstance Withdrawal SyndromeTime FactorsRats, WistarPain Measurement