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The effect of troleandomycin, a macrolide antibiotic, on theophylline elimination was examined in eight patients with chronic asthma. Clearance from serum was reduced by 50 +/- 6% (mean +/- SD) during administration of 250 mg troleandomycin four times daily. Reduction of clearance persisted to a lesser degree in one of these patients examined while receiving 250 mg troleandomycin daily. An increase in serum theophylline concentration can thus result from initiating troleandomycin in asthmatic patients receiving continuous treatment with theophylline. This may be at least a partial explanation for the apparent benefit of troleandomycin in chronic asthma and also suggests that possibility of inducing theophylline toxicity, including seizures, as was observed in one of the patients in this study.
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