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Morphinelike arousal by methadone during sleep

W B Pickworth, G L Neidert, D C Kay

    Clinical Pharmacology and Therapeutics
    |December 1, 1981
    PubMed
    Summary
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    Methadone and morphine have similar acute effects on sleep, increasing wakefulness and decreasing sleep quality. However, long-term use shows differences in their impact on arousal.

    Area of Science:

    • Pharmacology
    • Sleep Medicine
    • Neuroscience

    Background:

    • Opioid medications like methadone and morphine are widely used for pain management.
    • Understanding their acute and chronic effects on sleep is crucial for patient care.
    • Previous research suggests differing long-term effects on arousal between methadone and morphine.

    Purpose of the Study:

    • To compare the acute effects of methadone and morphine on sleep patterns.
    • To investigate if methadone induces insomnia similar to morphine.
    • To examine differences in arousal effects between the two opioids.

    Main Methods:

    • A randomized, double-blind, crossover study design was employed.
    • Seven non-dependent male opiate addicts participated.

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  • Sleep patterns were monitored after administration of methadone, morphine, or placebo via intramuscular injection.

    • Main Results:

    • Methadone and morphine demonstrated equipotent effects on increasing wakefulness and drowsiness.
    • Both drugs significantly reduced sleep efficiency and delta sleep.
    • Latency to rapid eye movement sleep (REMS) increased, while total REMS decreased with both opioids.

    Conclusions:

    • Acute administration of methadone produces sleep-arousal effects comparable to morphine.
    • This contrasts with observed differences in long-term administration, where morphine causes persistent arousal and methadone does not.
    • Findings highlight distinct chronic effects despite similar acute sleep disruption profiles.