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Related Experiment Videos

Tolerance develops to the spatial learning deficit produced by diazepam in rats

R K McNamara1, R W Skelton

  • 1Department of Psychiatry, University of Florida, Gainesville 32610, USA.

Pharmacology, Biochemistry, and Behavior
|March 1, 1997
PubMed
Summary

Tolerance to diazepam

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Behavioral Science

Background:

  • Diazepam, a benzodiazepine, is widely used but its long-term effects on memory and sedation are not fully understood.
  • Understanding tolerance development is crucial for managing therapeutic efficacy and side effects.

Purpose of the Study:

  • To investigate tolerance to diazepam's amnesic effects in rats after chronic treatment.
  • To determine if sedative and amnesic effects of diazepam can be dissociated through differential tolerance.
  • To assess the impact of diazepam withdrawal on mnemonic processes.

Main Methods:

  • Rats received acute or chronic diazepam (3 mg/kg) for varying durations (5, 15, 30 days).
  • Sedation was measured by exploratory activity in an open field.
  • Amnesia was assessed using spatial learning in the Morris water maze.

Main Results:

  • Tolerance to diazepam's sedative effects developed within 5 days.
  • Tolerance to diazepam's amnesic effects required 30 days of chronic treatment.
  • Withdrawal from chronic diazepam caused a mild, temporary disruption in spatial learning.

Conclusions:

  • Tolerance to diazepam's amnesic effects develops with extended chronic use.
  • Sedative and amnesic effects of diazepam appear largely independent due to differing tolerance rates.
  • Cessation of chronic diazepam treatment can transiently impair learning and memory processes.

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