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[Basic mechanisms of chronopharmacology].

G Labrecque, P M Bélanger

    Pathologie-Biologie
    |June 1, 1987
    PubMed
    Summary

    Drug effects and kinetics change over time due to biological rhythms. Understanding these circadian rhythms in absorption, metabolism, and excretion is key for optimizing drug therapy.

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    Area of Science:

    • Pharmacology
    • Chronobiology
    • Physiology

    Context:

    • Biological rhythms significantly influence drug pharmacokinetics and pharmacodynamics.
    • Factors like food intake do not fully explain circadian variations in xenobiotic absorption.
    • Existing research highlights time-dependent changes in drug absorption, metabolism, and excretion.

    Purpose:

    • To explore the role of circadian rhythms in drug absorption, metabolism, and excretion.
    • To identify key physiological factors contributing to time-dependent drug effects and kinetics.
    • To emphasize the importance of chronopharmacology in understanding drug behavior.

    Summary:

    • Circadian rhythms influence drug absorption via changes in blood flow and biliary secretion.
    • Hepatic enzyme activity, plasma protein binding, and blood flow impact drug metabolism rhythms.
    • Kidney function variations (urinary pH, glomerular filtration) explain circadian rhythms in drug elimination.

    Impact:

    • Highlights the necessity of considering biological timing for effective drug administration.
    • Suggests that circadian variations in drug elimination, metabolism, and absorption are multifactorial.
    • Underscores the need for further research into molecular mechanisms for improved drug optimization.

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