a bead-filled capsule of sustained-release theophylline ( slo-bid , william h. rorer , inc. , fort washington , pa ) was administered in equal doses twice daily ( 8 am and 8 pm ) to produce serum theophylline concentrations ( stcs ) between 10 and 20 micrograms ml .
C0700842
slo-bid
C0039771
theophylline