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Related Experiment Videos

Psychiatric symptoms in cannabis users

H Thomas1

  • 1Mid-Glamorgan Rotational Training Scheme in Psychiatry, Glanrhyd/Penyfai Hospital, Wales.

The British Journal of Psychiatry : the Journal of Mental Science
|August 1, 1993
PubMed
Summary

Cannabis intoxication can cause psychiatric symptoms and acute anxiety. While cannabis may worsen existing mental health conditions, evidence for it causing chronic psychosis is not convincing.

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Area of Science:

  • Psychiatry
  • Neuroscience
  • Pharmacology

Background:

  • Cannabis use is associated with various psychological effects.
  • Distinguishing intoxication phenomena from adverse reactions is crucial for clinical understanding.

Purpose of the Study:

  • To differentiate typical cannabis intoxication effects from adverse reactions.
  • To evaluate the evidence for cannabis as a cause of distinct psychiatric disorders.
  • To assess cannabis's role in the course of established mental illnesses.

Main Methods:

  • Review of clinical phenomena associated with cannabis use.
  • Classification of acute reactions, including anxiety and psychotic episodes.
  • Analysis of existing evidence regarding chronic psychiatric disorders and cannabis.

Main Results:

  • Cannabis intoxication commonly presents with psychiatric symptoms.
  • Acute anxiety is the most frequent adverse reaction; psychotic episodes are infrequent.
  • No distinct clinical entity of 'cannabis psychosis' is supported by consistent features.
  • Limited evidence suggests cannabis may influence, but not cause, chronic psychotic or affective disorders.

Conclusions:

  • Cannabis-induced psychiatric symptoms are typically transient and context-dependent.
  • Current evidence does not support cannabis as a direct cause of chronic psychotic or affective disorders.
  • Further research is needed to clarify the etiological role of cannabis in psychiatric conditions.

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