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Elimination pathways of terbutaline.

K Tegnér, H T Nilsson, C G Persson

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

    Terbutaline elimination varies significantly across species. Humans and rats extensively metabolize terbutaline, while dogs excrete it largely unchanged, impacting drug efficacy and dosing.

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    Area of Science:

    • Pharmacokinetics and Drug Metabolism
    • Comparative Animal Studies
    • Human Drug Elimination

    Background:

    • Understanding drug elimination pathways is crucial for optimizing therapeutic efficacy and safety.
    • Terbutaline, a beta-2 adrenergic agonist, is used for conditions like asthma and preterm labor.
    • Species-specific differences in drug metabolism can influence dosing regimens.

    Purpose of the Study:

    • To investigate and compare the primary elimination routes of tritium-labeled terbutaline in rats, dogs, and humans.
    • To elucidate the metabolic fate and excretion patterns of terbutaline following intravenous and oral administration.
    • To identify major metabolites and their respective excretion pathways across different species.

    Main Methods:

    • Administration of tritium-labeled terbutaline intravenously and orally to rats, dogs, and human subjects.
    • Quantification of drug and metabolite excretion in urine and bile.
    • Analysis of metabolic profiles, including unchanged drug and conjugates (glucuronide, sulfate).

    Main Results:

    • Rats excrete terbutaline mainly as a glucuronide conjugate via bile (40%) and urine (25%), with 70% first-pass metabolism after oral dosing.
    • Dogs excrete over 90% of a parenteral dose renally as unchanged terbutaline, with minimal biliary excretion and 13% first-pass metabolism.
    • Humans show intermediate elimination, with >90% renal excretion of parenteral doses (2/3 unchanged terbutaline), primarily as a sulfate conjugate, and significant first-pass metabolism (69%).

    Conclusions:

    • Terbutaline elimination pathways differ substantially between rats, dogs, and humans, with significant species-specific metabolism and excretion routes.
    • The high first-pass metabolism in rats and humans suggests limited oral bioavailability without dose adjustment.
    • Understanding these pharmacokinetic differences is essential for appropriate clinical use and drug development.

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