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We studied the effect of oral terbutaline on serum theophylline levels in 12 children with asthma. Sustained-release theophylline (10 mg/kg twice a day) was given with placebo or terbutaline (0.075 mg/kg three times a day) in a chronic, randomized, double-blind, crossover design. The trough serum theophylline concentration fell from 13.8 +/- 4.0 to 10.8 +/- 3.6 micrograms/ml and the peak expiratory flow rate increased from 285 +/- 30 to 310 +/- 29 L/min after terbutaline. Further investigation is needed to clarify the mechanism of action by which terbutaline decreases serum theophylline levels.
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