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Effect of omeprazole on the pharmacokinetics of itraconazole

  • PHARMACOKINETICS AND DISPOSITION
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Abstract

Objective: To investigate the effect of omeprazole on the pharmacokinetics of itraconazole.

Methods: Eleven healthy volunteers received a single dose of oral itraconazole (200 mg) on days 1 and 15 and oral omeprazole (40 mg) once daily from day 2 to day 15. Itraconazole pharmacokinetics were studied on days 1 and 15.

Results: Concentrations of itraconazole were higher when it was taken alone than when it was taken with omeprazole. With concomitant omeprazole treatment, the mean AUC0–24 and Cmax of itraconazole were significantly reduced by 64% and 66%, respectively.

Conclusion: Omeprazole affects itraconazole kinetics, leading to a reduction in bioavailability and Cmax. These two drugs should not be used together.

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Authors and Affiliations

  1. Division of Clinical Pharmacology, Department of Medicine, Faculty of Medicine, Prince of Songkla University, Hat Yai, Songkla 90112, Thailand Tel.: +66-074-212070-9; Fax: +66-074-212900/212903/212912, , , , , , TH

    S. Jaruratanasirikul & S. Sriwiriyajan

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  1. S. Jaruratanasirikul
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  2. S. Sriwiriyajan
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Received: 12 November 1997 / Accepted in revised form: 13 January 1998

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Jaruratanasirikul, S., Sriwiriyajan, S. Effect of omeprazole on the pharmacokinetics of itraconazole. E J Clin Pharmacol 54, 159–161 (1998). https://doi.org/10.1007/s002280050438

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  • DOI: https://doi.org/10.1007/s002280050438

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