DextromethorphanLarynxDextrorphanCoughAntitussive AgentsLevorphanolCytochrome P-450 CYP2D6Oxidoreductases, O-DemethylatingCold TemperatureLaryngeal NeoplasmsQuinidineGuaifenesinCodeineWhooping CoughChlorpheniramineLaryngectomyPerhexilineCytochrome P-450 Enzyme SystemDebrisoquinGastric DilatationExpectorantsMorphinansExcitatory Amino Acid AntagonistsCommon ColdPseudobulbar PalsyVocal CordsLaryngeal DiseasesLaryngeal MucosaReceptors, sigmaNasal DecongestantsPhonationMemantineMicrosomes, LiverGlottisReceptors, N-Methyl-D-AspartateLaryngeal MusclesDealkylation