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Dose-dependent pharmacokinetics of prednisolone in normal and adrenalectomized rats

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Abstract

The pharmacokinetics of prednisolone after 5- and 50-mg/kg doses given as the sodium succinate salt was examined in normal and adrenalectomized rats. Prednisolone, prednisone, and corticosterone concentrations in plasma were determined by HPCL and free prednisolone measured by equilibrium dialysis. Prednisolone sodium succinate was rapidly and completely hydrolyzed to prednisolone as indicated by the absence of the ester from plasma within 5 min after intravenous injection. Prednisolone was rapidly metabolized to prednisone, while corticosterone concentrations in normal rats declined rapidly and were undetectable by 1 hr. Adrenalectomy had no effect on the disposition and protein binding of prednisolone. Dose, however, had a marked effect on prednisolone pharmacokinetics, with mean plasma clearance decreasing from 6.18 to 3.07 L/h per kg and mean steady-state volume of distribution decreasing from 2.14 to 1.05 L/kg from the lower to higher steroid dose. Half-life (0.50 hr) and mean residence time (0.35 hr) were unaffected by dose. Prednisolone plasma protein binding was nonlinear due to saturation of transcortin binding. Changes in pharmacokinetic parameters were not related to the nonlinear plasma binding, but were more likely caused by saturation of elimination pathways and tissue binding sites.

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  1. F. Douglas Boudinot

    Present address: College of Pharmacy, University of Georgia, 30602, Athens, Georgia

Authors and Affiliations

  1. Department of Pharmaceutics, School of Pharmacy, State University of New York at Buffalo, 14260, Buffalo, New York

    F. Douglas Boudinot & William J. Jusko

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  2. William J. Jusko
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Supported in part by grant GM-24211 from the National Institutes of General Medical Sciences, NIH.

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Boudinot, F.D., Jusko, W.J. Dose-dependent pharmacokinetics of prednisolone in normal and adrenalectomized rats. Journal of Pharmacokinetics and Biopharmaceutics 14, 453–467 (1986). https://doi.org/10.1007/BF01059655

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