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Related Experiment Videos

Morphine tolerance and sensitization in the hamster.

P Schnur

    Pharmacology, Biochemistry, and Behavior
    |January 1, 1985
    PubMed
    Summary

    Researchers studied how morphine affects hamster movement. Repeated morphine doses showed decreased sedative effects (tolerance) and increased excitatory effects (sensitization), extending previous findings to higher doses.

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    Area of Science:

    • Pharmacology
    • Neuroscience
    • Behavioral Science

    Background:

    • Morphine exhibits biphasic effects on behavior, including sedation and excitation.
    • Previous studies have documented behavioral tolerance and sensitization to morphine in hamsters at lower doses.

    Purpose of the Study:

    • To investigate the effects of higher doses of morphine on hamster locomotor activity.
    • To characterize the dose-dependent changes in morphine's biphasic action.

    Main Methods:

    • Hamsters were administered repeated doses of morphine ranging from 5 to 40 mg/kg.
    • Locomotor activity was monitored to assess behavioral responses.

    Main Results:

    • Repeated morphine administration led to a decrease in sedative effects, indicating tolerance.
    • Conversely, excitatory effects of morphine increased with repeated administration, demonstrating sensitization.
    • These effects were observed across a higher dose range than previously studied.

    Conclusions:

    • The study confirms and extends findings on behavioral tolerance and sensitization to morphine in hamsters.
    • Higher doses of morphine elicit pronounced and distinct patterns of tolerance and sensitization.

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