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. 1983 Apr;15(4):411–418. doi: 10.1111/j.1365-2125.1983.tb01523.x

Cimetidine inhibits theophylline clearance in patients with chronic obstructive pulmonary disease: a study using stable isotope methodology during multiple oral dose administration.

R E Vestal, K E Thummel, B Musser, G D Mercer
PMCID: PMC1427813  PMID: 6849776

Abstract

1 The effect of concurrent cimetidine administration on the disposition of theophylline was investigated in eight male patients (56-78 years) with chronic obstructive pulmonary disease (COPD). 2 The patients, who were taking oral theophylline preparations chronically (384-1020 mg/day), received a [15N], [13C]-labelled analogue of theophylline (10 mg i.v.) before and during cimetidine treatment (1200 mg/day p.o.). 3 During cimetidine treatment trough levels of theophylline increased 34% (6.4 +/- 0.8 to 8.6 +/- 1.0 micrograms/ml, P less than 0.05), half-life increased 48% (6.5 +/- 0.6 to 9.6 +/- 0.8 h, P less than 0.001), and total plasma clearance decreased 33% (3.88 +/- 0.46 to 2.59 +/- 0.33 l/h, P less than 0.001), without a significant change in volume of distribution or protein binding. 4 The effect of cimetidine on plasma levels of theophylline was maximal within 72 h. Levels returned to control values within 48 h after its discontinuation. 5 Although there was no correlation with mean plasma concentrations of cimetidine, the change in clearance of theophylline correlated with initial clearance values (r = 0.72). 6 Cimetidine reduced the plasma clearance of theophylline in patients with COPD to an extent similar to that reported in healthy volunteers.

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Selected References

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