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Drug kinetics in childbirth

R L Nation

    Clinical Pharmacokinetics
    |July 1, 1980
    PubMed
    Summary

    During childbirth, physiological changes significantly alter how maternal drugs are absorbed, distributed, and cleared. Understanding these drug disposition changes is crucial for safe maternal and neonatal care.

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    Area of Science:

    • Pharmacology
    • Obstetrics
    • Neonatal Medicine

    Background:

    • Numerous drugs are administered during labor and delivery for maternal or fetal effects.
    • Physiological and biochemical changes during childbirth can significantly impact drug pharmacokinetics.
    • Placental transfer and potential neonatal drug burden are critical considerations.

    Purpose of the Study:

    • To review how physiological changes during labor and delivery affect drug disposition (absorption, distribution, clearance).
    • To highlight factors influencing fetal exposure and neonatal drug burden.
    • To emphasize the importance of these pharmacokinetic alterations in clinical management.

    Main Methods:

    • Review of existing literature on drug kinetics during labor and delivery.
    • Analysis of physiological changes impacting drug absorption, distribution, and clearance.
    • Examination of factors influencing fetal drug exposure and neonatal outcomes.

    Main Results:

    • Drug absorption may be altered by gastrointestinal function and blood flow changes.
    • Drug distribution is influenced by altered maternal blood volume, protein binding, and placental transfer.
    • Drug clearance data is limited but suggests potential alterations during childbirth, with possible fetal/placental contributions.

    Conclusions:

    • Labor and delivery induce significant physiological changes that modify drug disposition.
    • Factors like maternal posture, drug administration route, and timing affect fetal exposure and neonatal drug burden.
    • Awareness of altered pharmacokinetics is essential for optimizing maternal and neonatal care during childbirth.

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