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Related Experiment Videos

Pharmacokinetics of digoxin: interpreting bioavailability.

N Sanchez, L B Sheiner, H Halkin

    British Medical Journal
    |October 20, 1973
    PubMed
    Summary

    Digoxin bioavailability may appear different based on measurement methods. Methodological errors in bioavailability estimation require clinical awareness, especially for digoxin drug evaluations.

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    Area of Science:

    • Pharmacokinetics
    • Drug bioavailability studies
    • Clinical pharmacology

    Background:

    • Accurate assessment of oral drug bioavailability is critical for effective therapeutic use.
    • Digoxin bioavailability can be influenced by various factors, necessitating careful study design.
    • Understanding potential discrepancies in bioavailability measurements is essential for patient safety.

    Purpose of the Study:

    • To investigate the impact of feeding state on digoxin oral bioavailability estimation.
    • To highlight potential methodological errors in assessing drug bioavailability.
    • To emphasize the importance of critical evaluation of bioavailability data by clinicians.

    Main Methods:

    • A crossover study design was employed with three subjects.
    • Digoxin tablets were administered in both fasting and fed states.
    • Bioavailability was assessed using peak serum concentration, area under the curve, and urinary excretion.

    Main Results:

    • Peak serum digoxin concentration and AUC suggested higher bioavailability in the fasting state.
    • Cumulative five-day urinary digoxin excretion showed identical bioavailability in both fasting and fed states.
    • A discrepancy between different bioavailability assessment methods was observed.

    Conclusions:

    • Estimation of digoxin bioavailability is susceptible to significant methodological errors.
    • Clinicians must be aware of these potential errors when interpreting bioavailability data.
    • Careful consideration of measurement methodology is crucial for accurate drug bioavailability assessment.

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