title: Bronchodilator effect of ephedrine and theophylline after two to four weeks of repeated dosing.
mesh_terms: D000328:Adult; D000402:Airway Obstruction / Q000188:drug therapy*; D002986:Clinical Trials as Topic; D004359:Drug Therapy, Combination; D004809:Ephedrine / Q000008:administration & dosage* / Q000627:therapeutic use; D005540:Forced Expiratory Flow Rates; D005541:Forced Expiratory Volume; D006801:Humans; D010634:Phenobarbital / Q000008:administration & dosage / Q000627:therapeutic use; D010919:Placebos; D013806:Theophylline / Q000008:administration & dosage* / Q000627:therapeutic use
chemical_list: D010919:Placebos; D013806:Theophylline; D004809:Ephedrine; D010634:Phenobarbital