title: The pharmacology of bronchodilator drugs: introduction.
mesh_terms: D001249:Asthma / Q000188:drug therapy*; D000242:Cyclic AMP / Q000502:physiology; D006801:Humans; D013806:Theophylline / Q000627:therapeutic use*
chemical_list: D013806:Theophylline; D000242:Cyclic AMP