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Effect of cimetidine on the absorption of orally administered tetracycline



Effect of cimetidine on the absorption of orally administered tetracycline



British Journal of Clinical Pharmacology 9(2): 153-158



1 Six healthy female subjects received orally two 250 mg tetracycline tablets either with 400 mg cimetidine or placebo. In a separate experiment six healthy female volunteers received 500 mg tetracycline as a suspension on the fifth day of a 6 day regime of 400 mg cimetidine or placebo, 8 hourly and at bedtime. 500 mg tetracycline as tablets was also given with cimetidine only. 2 Following a single dose of cimetidine the mean peak tetracycline plasma concentration was significantly reduced by 1.2 microgram/ml and the area under the plasma concentration, time curve was decreased by 40%. The 72 h urinary tetracycline excretion was diminished by approximately 30%. 3 Tetracycline had no effect on the plasma concentration, time profile of cimetidine. 4 Administration of 400 mg cimetidine 8 hourly and at night for 6 days and dosing with 500 mg tetracycline as tablets or suspension on the fifth day produced no alteration in tetracycline kinetics. 5 It was concluded that under clinical circumstances it is unlikely that cimetidine produces a clinically significant alteration in tetracycline absorption or disposition. 6 The bioavailability of tetracycline from tablets and suspension was found to be similar (31.2% and 36.9% of the dose excreted in the urine over 72 h). 7 The mean renal clearance of tetracycline was 83.8 ml/min (95% confidence interval +/- 9.2 ml/min) and was unaltered by cimetidine treatment.

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Accession: 042900444

Download citation: RISBibTeXText

PMID: 7356903

DOI: 10.1111/j.1365-2125.1980.tb05826.x


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