DextromethorphanDextrorphanCoughAntitussive AgentsLevorphanolCytochrome P-450 CYP2D6Oxidoreductases, O-DemethylatingCold TemperatureQuinidineGuaifenesinCodeineWhooping CoughChlorpheniraminePerhexilineCytochrome P-450 Enzyme SystemDebrisoquinGastric DilatationExpectorantsMorphinansExcitatory Amino Acid AntagonistsCommon ColdPseudobulbar PalsyMedicine, Chinese TraditionalReceptors, sigmaNasal DecongestantsMicrosomes, LiverMemantineReceptors, N-Methyl-D-AspartatePharmaceutical PreparationsDealkylation