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Related Experiment Videos

Bioavailability of digoxin: some pitfalls and problems.

F Keller, N Rietbrock

    International Journal of Clinical Pharmacology and Biopharmacy
    |December 1, 1977
    PubMed
    Summary

    Tablet formulations of digoxin and its derivatives show varying bioavailability, averaging around 60-75%. Accurate bioavailability measurement requires steady-state data for reliable digoxin absorption analysis.

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    Area of Science:

    • Pharmacokinetics
    • Drug bioavailability
    • Tablet formulation analysis

    Background:

    • Bioavailability is crucial for determining the effective dose of orally administered medications.
    • Digoxin and its derivatives (beta-acetyldigoxin, beta-methyldigoxin) are commonly prescribed, necessitating accurate bioavailability data.
    • Understanding absorption characteristics is key to optimizing therapeutic outcomes.

    Purpose of the Study:

    • To determine the average bioavailability of tablet formulations for digoxin, beta-acetyldigoxin, and beta-methyldigoxin.
    • To establish the importance of steady-state data for accurate bioavailability calculations.
    • To explore methods for estimating bioavailability using single-dose renal excretion data.

    Main Methods:

    • Calculation of bioavailability from steady-state plasma concentration data.
    • Utilizing 24-hour renal excretion values after a single dose for screening bioavailability.
    • Performing absolute and relative bioavailability studies in cross-over arrangements.
    • Determining the absorption rate constant from plasma concentration and renal excretion data.

    Main Results:

    • Average bioavailability for tablet formulations: digoxin (60%), beta-acetyldigoxin (75%), beta-methyldigoxin (75%).
    • The absorption rate constant for digoxin and its derivatives is approximately 0.7 h⁻¹, with an absorption half-life of about 1 hour.
    • Absorption rate constants can be reliably calculated from plasma concentrations or renal excretion rates within 1-2 hours post-dose.

    Conclusions:

    • Tablet formulations of digoxin and its derivatives exhibit moderate to good bioavailability.
    • Steady-state data is essential for accurate bioavailability assessment, minimizing absorption phase influence.
    • Renal excretion data offers a viable screening method for bioavailability estimation, particularly in cross-over study designs.

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