The efficacy of sustained release theophylline (Pro-Vent), in asthma.
D000328:Adult; D000368:Aged; D001249:Asthma / Q000188:drug therapy*; D002986:Clinical Trials as Topic; D003692:Delayed-Action Preparations; D004311:Double-Blind Method; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D013806:Theophylline / Q000008:administration & dosage / Q000627:therapeutic use*
D003692:Delayed-Action Preparations; D013806:Theophylline