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Distribution of terbutaline.

A Ryrfeldt, C H Ramsay

    European Journal of Respiratory Diseases. Supplement
    |January 1, 1984
    PubMed
    Summary

    Whole body autoradiography in mice showed terbutaline radioactivity in most tissues was lower than blood. However, lung and heart concentrations of unchanged terbutaline were significantly higher, especially after respiratory administration.

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    Area of Science:

    • Pharmacokinetics
    • Radiopharmacology
    • Drug Distribution Studies

    Background:

    • Terbutaline is a bronchodilator used to treat asthma and COPD.
    • Understanding its distribution is crucial for optimizing therapeutic efficacy and minimizing side effects.

    Purpose of the Study:

    • To investigate the whole-body distribution and tissue-specific concentrations of terbutaline and its metabolites in mice.
    • To compare drug distribution following intravenous, oral, and respiratory administration routes.

    Main Methods:

    • Whole-body autoradiography using [3H]terbutaline in mice.
    • Intravenous, oral, and respiratory administration of the radiolabeled drug.
    • Quantification of radioactivity in various tissues and blood over time.

    Main Results:

    • Tissue and organ radioactivity generally mirrored or was lower than blood radioactivity, except in excretory organs, due to terbutaline's hydrophilic nature.
    • Significant concentrations of unchanged terbutaline in organs like the lung and heart were severalfold higher than serum levels.
    • This organ accumulation was most pronounced after respiratory administration and increased with time, suggesting slower tissue-to-blood redistribution.

    Conclusions:

    • Terbutaline exhibits complex tissue distribution, with potential for significant accumulation in target organs like the lungs.
    • Respiratory administration may enhance local drug concentrations, warranting further investigation into its clinical implications.
    • The findings suggest a possible discrepancy between blood clearance and tissue redistribution kinetics for terbutaline.

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