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Research ArticleArticle

IN VITRO AND IN VIVO EVALUATION OF THE METABOLISM AND PHARMACOKINETICS OF SEBACOYL DINALBUPHINE

Li-Heng Pao, Cheng-Huei Hsiong, Oliver Yoa-Pu Hu, Jhi-Jung Wang and Shung-Tai Ho
Drug Metabolism and Disposition March 2005, 33 (3) 395-402; DOI: https://doi.org/10.1124/dmd.104.002451
Li-Heng Pao
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Cheng-Huei Hsiong
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Oliver Yoa-Pu Hu
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Jhi-Jung Wang
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Shung-Tai Ho
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Abstract

A diester prodrug of nalbuphine, sebacoyl dinalbuphine (SDN), and its long-acting formulation are currently being developed to prolong the duration of nalbuphine. A comparative in vitro hydrolysis study was conducted for SDN in rat, rabbit, dog, and human blood. Both SDN and nalbuphine in blood or plasma were measured by high-performance liquid chromatography. The hydrolysis rates of SDN in blood were ranked as follows: rat > rabbit > human > dog. The rapid formation of nalbuphine in the blood accounted for almost 100% of the prodrug, which supported the contention that nalbuphine is the major metabolite after SDN hydrolysis. The hydrolysis profiles of SDN were similar both in plasma and in red blood cells when compared in the blood. In vitro release results of SDN long-acting formulation showed that the rate-limited step of SDN hydrolysis to nalbuphine in blood is the penetration of SDN from oil into the blood. After intravenous administration of SDN in sesame oil into rats, nalbuphine quickly appeared in plasma and, thereafter, exhibited monoexponential decay. Pharmaceutical dosage forms affecting the drug disposition kinetics were demonstrated after intravenous administration. The AUC of nalbuphine was significantly higher and clearance was significantly lower, without changes in the t1/2 of nalbuphine after intravenous dosing of SDN in sesame oil when compared with that of intravenous dosing with nalbuphine HCl in rats. Overall, these results suggest that SDN fulfilled the original pro-soft drug design in which the prodrug can rapidly metabolize to nalbuphine, and no other unexpected compounds were apparent in the blood.

Footnotes

  • This work was supported in part by grants from the National Science Council of Taiwan, Republic of China (NSC-84-2622-B-016-002).

  • Article, publication date, and citation information can be found at http://dmd.aspetjournals.org.

  • doi:10.1124/dmd.104.002451.

  • ABBREVIATIONS: SDN, sebacoyl dinalbuphine; HPLC, high-performance liquid chromatography; AUC, area under the curve; Cr/Cp, ratio of the drug concentration in red blood cells versus that in plasma; Hct, hematocrit of whole blood.

    • Received October 4, 2004.
    • Accepted December 10, 2004.
  • The American Society for Pharmacology and Experimental Therapeutics
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Drug Metabolism and Disposition: 33 (3)
Drug Metabolism and Disposition
Vol. 33, Issue 3
1 Mar 2005
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Research ArticleArticle

IN VITRO AND IN VIVO EVALUATION OF THE METABOLISM AND PHARMACOKINETICS OF SEBACOYL DINALBUPHINE

Li-Heng Pao, Cheng-Huei Hsiong, Oliver Yoa-Pu Hu, Jhi-Jung Wang and Shung-Tai Ho
Drug Metabolism and Disposition March 1, 2005, 33 (3) 395-402; DOI: https://doi.org/10.1124/dmd.104.002451

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Research ArticleArticle

IN VITRO AND IN VIVO EVALUATION OF THE METABOLISM AND PHARMACOKINETICS OF SEBACOYL DINALBUPHINE

Li-Heng Pao, Cheng-Huei Hsiong, Oliver Yoa-Pu Hu, Jhi-Jung Wang and Shung-Tai Ho
Drug Metabolism and Disposition March 1, 2005, 33 (3) 395-402; DOI: https://doi.org/10.1124/dmd.104.002451
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