HydrocodoneHydromorphoneCodeineOxycodoneOxymorphoneObstetric Surgical ProceduresAnalgesics, OpioidNarcoticsSubstance Abuse DetectionMorphine DerivativesOpioid-Related DisordersAntitussive AgentsMorphineGas Chromatography-Mass SpectrometryMiosisCytochrome P-450 CYP2D6AcetaminophenOpiate AlkaloidsMethadone