PseudoephedrineDextromethorphanEphedrineNasal DecongestantsDextrorphanAntitussive AgentsLevorphanolEphedraPhenylpropanolamineCytochrome P-450 CYP2D6TriprolidineOxidoreductases, O-DemethylatingLoratadineNonprescription DrugsChlorpheniramineSneezingCetirizineQuinidineDrug and Narcotic ControlCommon ColdGuaifenesinMethamphetamineCodeinePerhexilineCytochrome P-450 Enzyme SystemDebrisoquinGastric DilatationMorphinansExcitatory Amino Acid AntagonistsTabletsPseudobulbar PalsyLegislation, DrugReceptors, sigmaSubstance Abuse DetectionHistamine H1 Antagonists, Non-SedatingExpectorantsMemantineMicrosomes, LiverDouble-Blind MethodCoughOctanols