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Plasma concentrations, bioavailability and dissolution of chlorpropamide.

T Taylor, D F Assinder, L F Chasseaud

    European Journal of Clinical Pharmacology
    |March 11, 1977
    PubMed
    Summary

    Two new Melitase tablets demonstrate equivalent chlorpropamide bioavailability to the reference formulation. Formulation differences were not statistically significant, indicating comparable drug performance for this hypoglycemic agent.

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    Area of Science:

    • Pharmacokinetics and Drug Bioavailability
    • Pharmaceutical Formulation Development

    Background:

    • Chlorpropamide is a widely used hypoglycemic agent.
    • Evaluating the bioavailability of new drug formulations is crucial for therapeutic equivalence.

    Purpose of the Study:

    • To compare the bioavailability of chlorpropamide from two new Melitase tablet formulations against a reference formulation.
    • To assess the rate and extent of chlorpropamide absorption from the new formulations.

    Main Methods:

    • Bioavailability study comparing three chlorpropamide formulations (two new, one reference).
    • Analysis of plasma concentrations and dissolution profiles.
    • Statistical analysis including 95% confidence intervals and analysis of variance.

    Main Results:

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    • All three formulations showed equivalent bioavailability in both rate and extent, with 95% confidence intervals within approximately 16% of the reference.
    • Formulation-related differences in bioavailability and mean plasma concentrations were not statistically significant.
    • In vitro dissolution was pH-dependent, with faster dissolution at pH 7.2 compared to pH 2.0.

    Conclusions:

    • The new Melitase tablet formulations are bioequivalent to the reference chlorpropamide formulation.
    • Subject-related variability was a significant factor in bioavailability parameters.
    • The findings support the interchangeability of the new formulations with the existing reference product.