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Related Experiment Videos

Physiologic disposition of pergolide.

A Rubin, L Lemberger, P Dhahir

    Clinical Pharmacology and Therapeutics
    |August 1, 1981
    PubMed
    Summary

    This study tracked 14C-pergolide absorption and metabolism in healthy individuals. Most radioactivity was eliminated via urine and feces, with plasma levels peaking early and declining rapidly.

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    Area of Science:

    • Pharmacology
    • Drug Metabolism
    • Endocrinology

    Background:

    • Pergolide is a potent dopaminergic ergoline derivative.
    • It is clinically used for Parkinson's disease and hyperprolactinemic disorders.
    • Understanding its pharmacokinetic profile is crucial for therapeutic application.

    Purpose of the Study:

    • To investigate the absorption, distribution, metabolism, and excretion (ADME) of pergolide in healthy human subjects.
    • To characterize the pharmacokinetic profile of pergolide and its metabolites.
    • To assess the relationship between plasma pergolide levels and its pharmacological effects.

    Main Methods:

    • Administration of a single oral dose of 14C-labeled pergolide (138 micrograms) to healthy volunteers.
    • Measurement of radioactivity in plasma, red blood cells, and saliva over 96 hours.
    • Analysis of drug binding to plasma proteins.
    • Quantification of radioactivity excreted in urine, feces, and expired breath.

    Main Results:

    • Radioactivity was detected in plasma and red blood cells within 15-30 minutes, peaking at 1-2 hours and becoming undetectable after 96 hours.
    • Salivary radioactivity was significantly lower than plasma radioactivity.
    • Plasma radioactivity was not solely due to unchanged pergolide and did not correlate with the duration of prolactin-lowering effects.
    • Pergolide exhibited significant binding to plasma proteins, resistant to displacement by other drugs or metabolites.
    • Elimination occurred primarily through urine (55%) and feces (40%), with a minor portion (5%) excreted as 14CO2 in breath.

    Conclusions:

    • Pergolide is rapidly absorbed and distributed, with its effects potentially mediated by metabolites or complex pharmacokinetic interactions.
    • The drug undergoes extensive metabolism and is eliminated efficiently through both renal and fecal routes.
    • Understanding pergolide's protein binding and metabolite profile is essential for optimizing its therapeutic use in neurological and endocrine conditions.

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