Depression of theophylline elimination by erythromycin

作者：Kenneth W. Renton, Jean D. Gray, Orlando Ricardo Hung · 发表于：Clinical Pharmacology & Therapeutics · 年份：1981 · DOI：10.1038/clpt.1981.182 · 被引用次数：62 · 研究领域：Antibiotics Pharmacokinetics and Efficacy、Cancer therapeutics and mechanisms、Pharmacogenetics and Drug Metabolism

The elimination of a single oral dose of theophylline was studied in 12 healthy subjects before and after 250 mg erythromycin every 8 hr for 10 days. Serum theophylline elimination half-life rose from 4.79 +/- 0.43 hr before to 7.53 +/- 0.71 hr after erythromycin. Theophylline clearance decreased from a mean of 91.6 +/- 27.0 to 54.8 +/- 10.0 ml/kg/hr after erythromycin and the mean apparent volumes of distribution were much the same before and after the antibiotic. The excretion of theophylline and its metabolites was studied in the urine of three of the subjects. In each case the amount of 3-methylxanthine and 1,3-dimethyluric acid decreased after antibiotic. Adjustments of the theophylline dosage may be necessary for patients who take theophylline and erythromycin concurrently to minimize the risk of theophylline toxicity.