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Cannabinoids and psychosis.

Deepak Cyril D'Souza1

  • 1Department of Psychiatry, Yale University School of Medicine, VA Connecticut Healthcare System, West-Haven, Connecticut 06516, USA.

International Review of Neurobiology
|March 14, 2007
PubMed
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Cannabis use can trigger temporary psychosis and worsen existing psychotic disorders. While not a sole cause of schizophrenia, cannabis may be a contributing factor interacting with genetic risks.

Area of Science:

  • Neuroscience
  • Psychiatry
  • Epidemiology

Background:

  • Cannabinoids are increasingly linked to psychosis, prompting renewed scientific interest.
  • Cannabis use can induce acute psychotic symptoms and exacerbate existing psychotic disorders.

Purpose of the Study:

  • To review evidence for and against the association between cannabinoids and psychosis.
  • To explore the role of cannabis as a potential causal factor in schizophrenia.
  • To investigate the endogenous cannabinoid system's involvement in psychotic disorders.

Main Methods:

  • Review of epidemiological studies on cannabis use and psychosis.
  • Analysis of evidence for causality criteria (dose-response, temporality, etc.).
  • Examination of neurochemical, genetic, and postmortem studies on CB1 receptors.

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Main Results:

  • Cannabinoids can cause acute psychosis and worsen existing conditions, with effects lasting beyond intoxication.
  • Evidence for cannabis as a sole cause of persistent psychosis is inconclusive; it may be a component cause interacting with genetic factors.
  • Schizophrenia rates have not risen proportionally with cannabis use, suggesting it's not the sole cause.

Conclusions:

  • Cannabis exposure is a potential component cause of schizophrenia, interacting with other risk factors.
  • Further research is needed to identify individuals at risk for cannabinoid-related psychosis and understand underlying mechanisms.
  • Dysfunction in the CB1 receptor system may play a role in schizophrenia pathophysiology.