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Age and fentanyl pharmacokinetics

J B Bentley, J D Borel, R E Nenad

    Anesthesia and Analgesia
    |December 1, 1982
    PubMed
    Summary

    Elderly patients exhibit higher serum fentanyl concentrations and a longer drug effect duration due to decreased drug clearance. This pharmacokinetic difference impacts fentanyl dosing in older adults.

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    Area of Science:

    • Pharmacology
    • Geriatric Medicine
    • Anesthesiology

    Background:

    • Fentanyl is a potent opioid analgesic commonly used in clinical practice.
    • Age-related physiological changes can alter drug pharmacokinetics, potentially affecting efficacy and safety.

    Purpose of the Study:

    • To compare fentanyl pharmacokinetics in younger (<50 years) versus older (>60 years) adult patients.
    • To investigate the impact of age on fentanyl serum concentrations, elimination half-life, and clearance.

    Main Methods:

    • Two groups of adult patients received an equivalent intravenous dose of fentanyl (10 microgram/kg).
    • Serum fentanyl concentrations and pharmacokinetic parameters were analyzed and compared between age groups.

    Main Results:

    • Older patients demonstrated significantly higher serum fentanyl concentrations compared to younger patients.
    • The terminal elimination half-life of fentanyl was prolonged in the elderly group (945 min vs. 265 min).
    • Drug clearance was markedly reduced in older adults (265 ml/min vs. 991 ml/min).

    Conclusions:

    • Age significantly influences fentanyl pharmacokinetics, leading to higher drug exposure in elderly patients.
    • Reduced drug clearance in older adults results in a prolonged duration of fentanyl's clinical effect.
    • These findings suggest a need for careful fentanyl dose titration in geriatric populations.

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