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Related Experiment Videos

Vancomycin disposition: the importance of age.

N R Cutler, P K Narang, L J Lesko

    Clinical Pharmacology and Therapeutics
    |December 1, 1984
    PubMed
    Summary

    Elderly individuals exhibit altered vancomycin pharmacokinetics, with a longer half-life and reduced clearance. These changes necessitate adjustments to vancomycin dosing regimens in older populations.

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    Area of Science:

    • Pharmacology
    • Geriatric Medicine
    • Drug Metabolism

    Background:

    • Vancomycin is a critical antibiotic for treating serious Gram-positive bacterial infections.
    • Age-related physiological changes can significantly impact drug pharmacokinetics.
    • Understanding vancomycin kinetics in the elderly is crucial for optimizing treatment and minimizing toxicity.

    Purpose of the Study:

    • To investigate the influence of age on vancomycin disposition and excretion.
    • To compare vancomycin pharmacokinetic parameters between young and elderly healthy male subjects.
    • To determine if current vancomycin dosing recommendations are appropriate for the elderly population.

    Main Methods:

    • Intravenous infusion of vancomycin (6 mg/kg) in 12 healthy men (6 young, 6 elderly).
    • Serial blood and urine sample collection for 2 days post-dosing.
    • Assay of unchanged vancomycin using radioimmunoassay and analysis via a three-compartment model (SAAM-27).

    Main Results:

    • Mean vancomycin half-life (t1/2) was significantly longer in the elderly (12.1 hr) compared to young subjects (7.2 hr).
    • Total systemic and renal clearances of vancomycin were reduced in the elderly, independent of renal function.
    • Volume of distribution at steady state increased in the elderly, potentially due to enhanced tissue binding.

    Conclusions:

    • Age significantly alters vancomycin pharmacokinetics, characterized by prolonged elimination and reduced clearance in the elderly.
    • Current vancomycin dosing regimens may require modification for elderly patients to ensure efficacy and safety.
    • Further research into vancomycin excretion mechanisms, likely glomerular filtration, is supported by these findings.

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