CodeineAntitussive AgentsMorphine DerivativesHydrocodoneSubstance Abuse DetectionNarcoticsGas Chromatography-Mass SpectrometryMorphineDealkylationCytochrome P-450 CYP2D6BiotransformationAnalgesics, OpioidPapaverNalorphineHydromorphoneOpiumDebrisoquinDextropropoxypheneTramadolChromatography, High Pressure LiquidAdministration, OralOxymorphoneEthylmorphineProdrugsCoughDiphenoxylateOxycodoneDextromethorphanSweat