CodeineAntitussive AgentsMorphine DerivativesHydrocodoneSubstance Abuse DetectionNarcoticsMorphineGas Chromatography-Mass SpectrometryNalorphinePapaverDealkylationAnalgesics, OpioidHydromorphoneOpiumDebrisoquinDextropropoxypheneCytochrome P-450 CYP2D6EthylmorphineOxymorphoneCoughDiphenoxylateOxycodoneDextromethorphan