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Related Experiment Videos

Three times daily or 8-hourly.

R Nigam, B J Loveday, S L Grainger

    Journal of the Royal Society of Medicine
    |January 1, 1986
    PubMed
    Summary

    Irregular dosing of medications taken three times daily significantly impacts drug levels. This study found inconsistent timing increased peak drug concentrations by 10% and lowered trough levels by 64% compared to regular dosing.

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    Area of Science:

    • Pharmacokinetics and pharmacodynamics
    • Clinical pharmacology
    • Drug administration and patient adherence

    Background:

    • Medication adherence is crucial for therapeutic efficacy.
    • Many patients taking multiple daily doses struggle with consistent timing.
    • Irregular drug intake can lead to suboptimal therapeutic outcomes.

    Purpose of the Study:

    • To assess the impact of irregular drug ingestion timing on pharmacokinetic profiles.
    • To quantify the changes in peak and trough drug levels due to inconsistent dosing intervals.

    Main Methods:

    • Studied 58 outpatients on thrice-daily medication regimens.
    • Recorded actual dosing times over 24 hours.
    • Simulated hydralazine pharmacokinetics based on observed irregular dosing intervals.

    Main Results:

    • Mean intervals between doses were 5.7, 6.1, and 12.2 hours.
    • Irregular administration increased peak drug levels by 10%.
    • Irregular administration decreased trough drug levels by 64% compared to regular 8-hourly dosing.

    Conclusions:

    • Inconsistent drug dosing significantly alters pharmacokinetic parameters.
    • Patient education on regular dosing schedules is essential.
    • Suboptimal drug levels due to irregular intake may reduce treatment effectiveness.

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