title: Should bronchodilators be combined in chronic bronchitis and emphysema?
mesh_terms: D000818:Animals; D001286:Atropine Derivatives / Q000627:therapeutic use*; D001991:Bronchitis / Q000188:drug therapy*; D002908:Chronic Disease; D004359:Drug Therapy, Combination; D006801:Humans; D009241:Ipratropium / Q000627:therapeutic use*; D011656:Pulmonary Emphysema / Q000188:drug therapy*; D013806:Theophylline / Q000627:therapeutic use*
chemical_list: D001286:Atropine Derivatives; D013806:Theophylline; D009241:Ipratropium