bronchodilation and side effects of 28 days treatment with either a full therapeutic dose of theophylline slow-release preparation 500 mg twice daily ( 400-600 mg ) , a slow-release terbutaline preparation 10 mg twice daily or combinations of the 2 drugs in full or half doses were evaluated in 31 asthmatic outpatients in a double-blind , randomized crossover design .
C0039542
terbutaline
C0004096
asthmatic