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Multiple-dose quazepam kinetics.

M Chung, J M Hilbert, R P Gural

    Clinical Pharmacology and Therapeutics
    |April 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

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    Quazepam, a benzodiazepine hypnotic, shows rapid absorption and long-lasting effects due to its metabolites. Steady-state kinetics were predictable, explaining its clinical hypnotic action without rebound insomnia.

    Area of Science:

    • Pharmacology
    • Clinical Pharmacokinetics
    • Drug Metabolism

    Background:

    • Quazepam is a benzodiazepine hypnotic agent.
    • Understanding its pharmacokinetic profile is crucial for optimizing therapeutic use.
    • Active metabolites contribute significantly to the overall drug effect.

    Purpose of the Study:

    • To evaluate the steady-state pharmacokinetics of quazepam and its major active metabolites (2-oxoquazepam and N-desalkyl-2-oxoquazepam).
    • To assess the time to reach steady-state drug levels.
    • To correlate kinetic profiles with clinical hypnotic effects.

    Main Methods:

    • Normal subjects received 15 mg of quazepam orally once daily for 14 days.
    • Plasma concentrations of quazepam and its metabolites were analyzed.

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  • Pharmacokinetic parameters were determined using a two-compartment open model.

    • Main Results:

    • Quazepam and its metabolites, 2-oxoquazepam and N-desalkyl-2-oxoquazepam, were rapidly absorbed and appeared quickly in circulation.
    • Elimination half-lives were approximately 41 hr (quazepam), 43 hr (2-oxoquazepam), and 75 hr (N-desalkyl-2-oxoquazepam).
    • Steady-state levels were reached by the seventh dose for quazepam/2-oxoquazepam and thirteenth dose for N-desalkyl-2-oxoquazepam.

    Conclusions:

    • The pharmacokinetic profile of quazepam, characterized by rapid absorption and long elimination half-lives of its active metabolites, supports its clinical efficacy.
    • Predictable steady-state kinetics contribute to rapid sleep induction and sustained hypnotic action.
    • The observed kinetics may explain the lack of significant rebound insomnia with quazepam treatment.