in a single-blind , crossover study 10 adult asthmatic patients received a theophylline-ephedrine combination tablet ( theophylline 90 mg , ephedrine 16 mg and phenobarbital 25 mg in an immediate release layer and theophylline 90 mg and ephedrine 32 mg in a sustained release layer ) twice daily or terbutaline 5 mg three times daily for two weeks .
C0004096
asthmatic
C0039771
theophylline