title: The development of drug tolerance during long-term beta2-agonist bronchodilator therapy.
mesh_terms: D001249:Asthma / Q000188:drug therapy / Q000503:physiopathology; D002648:Child; D002986:Clinical Trials as Topic; D004311:Double-Blind Method; D004361:Drug Tolerance; D004809:Ephedrine / Q000627:therapeutic use; D005541:Forced Expiratory Volume; D006801:Humans; D007545:Isoproterenol / Q000627:therapeutic use*; D009921:Metaproterenol / Q000627:therapeutic use*
chemical_list: D009921:Metaproterenol; D004809:Ephedrine; D007545:Isoproterenol