OxycodoneOxymorphoneAnalgesics, OpioidHydrocodoneMorphinansNarcoticsMorphineDelayed-Action PreparationsForensic MedicinePainPain MeasurementSubstance Abuse DetectionPain, PostoperativeAnesthetics, IntravenousOpioid-Related DisordersDouble-Blind MethodAnalgesia, EpiduralMiosisMorphine DerivativesNarcotic AntagonistsNaloxoneAdministration, CutaneousOpiate AlkaloidsReceptors, Opioid, muSufentanilAdjuvants, AnesthesiaAnesthesia, IntravenousAlfentanilBupivacaineCodeineCytochrome P-450 CYP2D6Preanesthetic MedicationDrug InteractionsAnesthetics, CombinedAnalgesia, ObstetricalCorydalisGas Chromatography-Mass Spectrometry