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Intrapatient variability in theophylline kinetics

P D Walson, R C Strunk, L M Taussig

    The Journal of Pediatrics
    |August 1, 1977
    PubMed
    Summary
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    Asthmatic children show significant variability in theophylline pharmacokinetics, even over short periods. Repeated measurements are crucial, as one test cannot reliably predict future theophylline dosage needs.

    Area of Science:

    • Pharmacology
    • Pediatric Medicine
    • Respiratory Medicine

    Background:

    • Theophylline is a critical medication for managing asthma in children.
    • Accurate dosing of theophylline is essential for therapeutic efficacy and minimizing toxicity.
    • Pharmacokinetic parameters, including clearance and half-life (t1/2), dictate theophylline dosage regimens.

    Purpose of the Study:

    • To assess the intrapatient variability of theophylline pharmacokinetic parameters in asthmatic children.
    • To determine if a single pharmacokinetic measurement can predict future dosing requirements.

    Main Methods:

    • Longitudinal study involving seven asthmatic children.
    • Repeat pharmacokinetic measurements of theophylline were conducted over three- to nine-month intervals.

    Related Experiment Videos

  • Analysis focused on intrapatient variability in theophylline clearance and elimination half-life (t1/2).

    • Main Results:

    • Significant intrapatient variability was observed in theophylline clearance and t1/2.
    • Repeat clearance values differed from original measurements by an average of 52% (range: -57% to +142%).
    • This variability impacts the ability to maintain consistent theophylline plasma levels.

    Conclusions:

    • A single theophylline pharmacokinetic determination is insufficient for routine prediction of future dosage regimens in individual pediatric asthma patients.
    • Regular monitoring and repeat pharmacokinetic assessments are necessary for optimizing theophylline therapy in children.
    • Intrapatient variability highlights the dynamic nature of drug metabolism and elimination in this population.