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The effect of ranitidine and cimetidine on imipramine disposition

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Summary

The pharmacokinetic characteristics of imipramine were studied after a single, oral, 100 mg dose was taken by 12 healthy male subjects following 3 days of pretreatment with placebo, cimetidine (300 mg every 6 h), and ranitidine (150 mg every 12 h) in a randomized, double blind, crossover trial. After each imipramine dose plasma samples were collected for 72 h and assayed for imipramine, desipramine, 2-hydroxyimipramine and 2-hydroxydesipramine by HPLC. Cimetidine preadministration statistically prolonged imipramine t1/2 compared to ranitidine (22.7 vs. 13.0 h) or placebo (10.8 h). Mean imipramine area under the curve (AUC) following cimetidine pretreatment was more than double that following placebo (2.633 vs. 0.966 µg·h·ml−1) or ranitidine (1.14 µg·h·ml−1) pretreatment. Imipramine apparent oral clearance was reduced in all 12 subjects after cimetidine. Compared to ranitidine or placebo, cimetidine pretreatment was associated with an increased imipramine/desipramine AUC ratio, suggesting cimetidine-induced impairment of demethylation of imipramine. Ranitidine was not observed to alter imipramine pharmacokinetics.

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Authors and Affiliations

  1. Department of Clinical Pharmacy, Pharmacodynamic Laboratory, College of Pharmacy, College of Medicine and Clinical Research Center at the University of Tennessee, Memphis, TN, USA

    B. G. Wells, J. A. Pieper, T. H. Self, C. F. Stewart, S. L. Waldon, L. Bobo & C. Warner

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  1. B. G. Wells
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  2. J. A. Pieper
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  3. T. H. Self
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  4. C. F. Stewart
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  5. S. L. Waldon
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  6. L. Bobo
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  7. C. Warner
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Wells, B.G., Pieper, J.A., Self, T.H. et al. The effect of ranitidine and cimetidine on imipramine disposition. Eur J Clin Pharmacol 31, 285–290 (1986). https://doi.org/10.1007/BF00981125

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  • DOI: https://doi.org/10.1007/BF00981125

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