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The repeated one-point method for predicting dose sizes with irregular dosing intervals.

G A Thompson, W A Ritschel

    International Journal of Clinical Pharmacology, Therapy, and Toxicology
    |July 1, 1986
    PubMed
    Summary
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    Calculating drug dosages can be challenging due to limited data or patient-specific changes. A modified repeated one-point method (ROPM) adapts to unequal dosing intervals, improving drug therapy management.

    Area of Science:

    • Pharmacokinetics
    • Clinical Pharmacology
    • Drug Dosing

    Background:

    • Standard drug dosage calculations rely on literature pharmacokinetic parameters.
    • These parameters may be unavailable or show significant interindividual variability.
    • Altered drug distribution and elimination in conditions like heart failure or obesity necessitate dosage adjustments.

    Purpose of the Study:

    • To address limitations of the repeated one-point method (ROPM) in clinical practice.
    • To propose a modification of the ROPM for unequal dosing intervals.
    • To present strategies for optimizing drug regimens under non-ideal dosing schedules.

    Main Methods:

    • The study modifies the ROPM, which typically assumes equal dosing intervals.
    • It explores scenarios with unequal dosing intervals, a common practice in hospitals.

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  • Four specific situations involving dose adjustments are presented and analyzed.

    • Main Results:

    • The modified ROPM offers solutions for maintaining therapeutic drug concentrations despite irregular dosing.
    • Strategies include adjusting dose sizes to keep minimum or maximum concentrations constant.
    • Alternative approaches use equal doses while respecting concentration limits.

    Conclusions:

    • The modified ROPM provides a practical approach for drug dosage calculations when intervals are unequal.
    • This method enhances the reliability of drug therapy initiation and management in diverse clinical settings.
    • It offers flexibility in dose adjustments to ensure patient safety and efficacy.