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Chlorpropamide bioavailability and pharmacokinetics

R Huupponen, R Lammintausta

    International Journal of Clinical Pharmacology, Therapy, and Toxicology
    |July 1, 1981
    PubMed
    Summary
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    This study on chlorpropamide pharmacokinetics in healthy volunteers found consistent absorption but long, variable elimination half-lives. Bioavailability differences are unlikely to explain interindividual variations in steady-state concentrations.

    Area of Science:

    • Pharmacology
    • Clinical Pharmacy
    • Drug Metabolism

    Background:

    • Chlorpropamide is an oral hypoglycemic agent.
    • Significant interindividual variability in chlorpropamide steady-state concentrations has been reported.
    • Understanding chlorpropamide pharmacokinetics is crucial for optimizing its therapeutic use.

    Purpose of the Study:

    • To investigate the pharmacokinetics of chlorpropamide.
    • To assess the impact of intravenous and oral administration on chlorpropamide bioavailability.
    • To explore potential reasons for interindividual variations in chlorpropamide concentrations.

    Main Methods:

    • Eight healthy volunteers participated in the study.
    • Pharmacokinetic parameters were determined after intravenous (i.v.) and oral (p.o.) administration of chlorpropamide.

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  • Area under the curve (AUC) and elimination half-life were analyzed.

    • Main Results:

    • A long elimination half-life for chlorpropamide was observed, with notable intersubject variability.
    • Normalized areas under the curve (AUCs) were consistent across subjects, indicating similar absorption.
    • No significant difference was found between AUCs after i.v. and p.o. administration, suggesting comparable bioavailability.

    Conclusions:

    • Chlorpropamide exhibits a long and variable elimination half-life.
    • The bioavailability of chlorpropamide appears consistent between intravenous and oral routes.
    • Differences in bioavailability are unlikely to be the primary cause of observed interindividual variations in chlorpropamide steady-state concentrations.