DextromethorphanDextrorphanPulmonary EmphysemaEmphysemaAntitussive AgentsLevorphanolCytochrome P-450 CYP2D6Subcutaneous EmphysemaOxidoreductases, O-DemethylatingMediastinal EmphysemaQuinidineGuaifenesinChlorpheniramineCodeinePerhexilineCytochrome P-450 Enzyme SystemDebrisoquinGastric DilatationMorphinansExcitatory Amino Acid AntagonistsPseudobulbar PalsyReceptors, sigmaCoughExpectorantsMemantineMicrosomes, LiverReceptors, N-Methyl-D-Aspartatealpha 1-Antitrypsin DeficiencyDealkylationPancreatic Elastase