Efficacy of dyphylline (dihydroxypropyltheophylline) in exercise-induced bronchospasm.

The efficacy of dyphlline in prevention of exercise-induced bronchospasm (EIB) was studied in seven subjects. A single 15 mg/kg dose of dyphylline 40 minutes prior to exercise prevented EIB as documented by a significantly smaller mean greatest percent decrease in forced expiratory volume in one second when compared to placebo. Mean serum dyphylline concentrations 40 minutes after a dose of 15 mg/kg were probably in the lower portion of the therapeutic range.