DextromethorphanDextrorphanCoughAntitussive AgentsLevorphanolCytochrome P-450 CYP2D6Oxidoreductases, O-DemethylatingCold TemperatureQuinidineGuaifenesinAirway ObstructionCodeineAirway RemodelingAirway ResistanceWhooping CoughChlorpheniraminePerhexilineCytochrome P-450 Enzyme SystemDebrisoquinExpectorantsGastric DilatationMorphinansExcitatory Amino Acid AntagonistsCommon ColdPseudobulbar PalsyNasal DecongestantsReceptors, sigmaMemantineMicrosomes, LiverReceptors, N-Methyl-D-AspartateDealkylationBronchiRespiratory System