DextromethorphanGarlicDextrorphanCoughAntitussive AgentsLevorphanolCytochrome P-450 CYP2D6Oxidoreductases, O-DemethylatingCold TemperatureQuinidineGuaifenesinAllyl CompoundsSulfinic AcidsCodeinePlants, MedicinalWhooping CoughCytochrome P-450 Enzyme SystemChlorpheniraminePerhexilinePlant ExtractsDebrisoquinGastric DilatationExpectorantsMorphinansExcitatory Amino Acid AntagonistsCommon ColdPseudobulbar PalsyReceptors, sigmaNasal DecongestantsPhytotherapyMemantineMicrosomes, LiverAlliumSulfidesReceptors, N-Methyl-D-AspartateDealkylation