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Age-related changes in trimethadione oxidizing capacity.

E Tanaka, A Ishikawa, A Ono

    British Journal of Clinical Pharmacology
    |March 1, 1987
    PubMed
    Summary

    Elderly males exhibit significantly prolonged elimination half-lives and reduced clearance for trimethadione (TMO) compared to younger individuals. This age-related metabolic difference suggests impaired N-demethylation in older populations.

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    Area of Science:

    • Pharmacokinetics and Drug Metabolism
    • Geriatric Medicine
    • Clinical Pharmacology

    Background:

    • Trimethadione (TMO) is an anticonvulsant medication with known metabolic pathways.
    • Age-related changes in drug metabolism can significantly alter pharmacokinetic profiles.
    • Understanding TMO metabolism across different age groups is crucial for optimizing therapeutic use.

    Purpose of the Study:

    • To investigate the pharmacokinetic differences of trimethadione (TMO) metabolism in young versus elderly male patients.
    • To determine the impact of aging on TMO elimination half-life, clearance, and metabolite formation.

    Main Methods:

    • Oral administration of trimethadione (TMO) at a dose of 4 mg/kg to two groups of male subjects (11 young, 11 elderly).
    • Measurement of TMO and its metabolite dimethadione (DMO) serum concentrations over time.

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  • Calculation of pharmacokinetic parameters including elimination half-life, total body clearance, and apparent volume of distribution.

    • Main Results:

    • Elderly males showed a significantly longer TMO elimination half-life (23.5 h vs. 11.8 h, P < 0.01) compared to young males.
    • Total body clearance of TMO was significantly lower in elderly males (29.0 L/h/kg vs. 41.4 L/h/kg, P < 0.01).
    • The ratio of dimethadione (DMO) to TMO in serum at 4 hours was lower in the elderly (0.46 vs. 0.65, P < 0.01), indicating reduced N-demethylation.

    Conclusions:

    • Age significantly impacts trimethadione (TMO) pharmacokinetics, leading to decreased clearance and prolonged half-life in elderly males.
    • The N-demethylation metabolic pathway of TMO appears to be inversely related to age.
    • These findings highlight the importance of considering age in TMO dosing and therapeutic management.