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Related Experiment Videos

Zopiclone poisoning: tissue distribution and potential for postmortem diffusion

D J Pounder1, J I Davies

  • 1Department of Forensic Medicine, University of Dundee, UK.

Forensic Science International
|May 13, 1994
PubMed
Summary

This study examined zopiclone (a hypnotic drug) distribution in a fatal overdose case. Zopiclone showed stable postmortem blood levels with minimal redistribution, but gastric residue caused localized increases.

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Area of Science:

  • Forensic Toxicology
  • Pharmacology

Background:

  • Zopiclone is a cyclopyrrolone hypnotic agent.
  • This study investigates its tissue distribution and postmortem redistribution in a fatal overdose case.

Observation:

  • A fatal suicidal overdose case involving a 29-year-old female was analyzed.
  • Zopiclone blood concentrations ranged from 0.9-2.0 µg/ml initially and 0.9-1.8 µg/ml after 40 hours.
  • Significant concentrations were found in spleen (5.8 µg/g), peri-renal fat (5.0 µg/g), and liver (up to 4.9 µg/g).

Findings:

  • Zopiclone exhibited minimal preferential concentration in solid organs.
  • Postmortem blood concentrations remained relatively stable with little evidence of redistribution artifacts.
  • Elevated levels in the left liver lobe and left lung were attributed to postmortem diffusion from gastric residue.

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Implications:

  • Zopiclone's pharmacokinetic profile suggests relatively stable postmortem blood concentrations.
  • Understanding postmortem diffusion is crucial for interpreting drug levels in forensic investigations.
  • This data aids in the toxicological analysis of zopiclone-related fatalities.