because there are few published studies on capsulized sustained-release theophylline ( srt ) products in children , we compared slo-bid capsules to theo-dur tablets in a group of school age children and young adults with asthma in an 8-week randomized crossover study design with patients maintaining daily symptom diary cards and peak expiratory flow rates .
C0039771
theophylline
C0004096
asthma