twenty-one patients , 12 to 18 years of age , with nocturnal asthma controlled with sustained-release theophylline administered twice daily , were enrolled in a 10-week , double-blind , two-way crossover study that compared theo-dur tablets administered twice daily with an equivalent daily dose of uniphyl tablets administered once daily at bedtime .
C0039771
theophylline
C0700814
uniphyl