title: The background to Duovent.
abstract: The tone of bronchial muscle depends on the balance between the activity of the parasympathetic and sympathetic divisions of the autonomic nervous system. It is possible to produce broncho-dilatation either by stimulating the sympathetic pathway with sympathomimetic agents such as fenoterol or inhibiting the action of the parasympathetic system using anti-cholinergic agents such as ipratropium bromide.
mesh_terms: D000336:Aerosols; D001286:Atropine Derivatives / Q000627:therapeutic use*; D004338:Drug Combinations / Q000494:pharmacology / Q000627:therapeutic use; D004357:Drug Synergism; D004983:Ethanolamines / Q000627:therapeutic use*; D005280:Fenoterol / Q000494:pharmacology / Q000627:therapeutic use*; D005541:Forced Expiratory Volume; D006801:Humans; D009241:Ipratropium / Q000494:pharmacology / Q000627:therapeutic use*; D008173:Lung Diseases, Obstructive / Q000188:drug therapy*
chemical_list: D000336:Aerosols; D001286:Atropine Derivatives; D004338:Drug Combinations; D004983:Ethanolamines; C030809:fenoterol, ipratropium drug combination; D005280:Fenoterol; D009241:Ipratropium