Double-blind evaluation of an anti-asthmatic agent.
D000293:Adolescent; D000328:Adult; D001249:Asthma / Q000188:drug therapy*; D001993:Bronchodilator Agents / Q000627:therapeutic use*; D002648:Child; D002986:Clinical Trials as Topic; D005260:Female; D006140:Guaifenesin / Q000627:therapeutic use*; D006801:Humans; D008297:Male; D008875:Middle Aged; D010919:Placebos; D012129:Respiratory Function Tests; D013566:Sympathomimetics / Q000627:therapeutic use*; D013806:Theophylline / Q000627:therapeutic use*
D001993:Bronchodilator Agents; D010919:Placebos; D013566:Sympathomimetics; D006140:Guaifenesin; D013806:Theophylline