title: Cannabis and acute psychosis.
abstract: The Present State Examination was used to assess the psychopathology of 23 psychotic patients who were cannabis positive on urinary screening, and 46 matched drug-free controls. Cases and controls were indistinguishable in terms of psychopathology, DSMIII diagnoses, onset of recent illness, the proportion of first admissions, ethnicity, and socio-economic class, differing only in their histories of substance use. These data suggest that psychosis which develops or recurs in the context of cannabis use does not have a characteristic psychopathology or mode of onset, and is not restricted to a particular ethnic or socio-demographic group. There is thus little evidence to support the validity of 'cannabis psychosis' as a diagnostic entity.
authors.affiliation: Department of Psychological Medicine and Genetics, Institute of Psychiatry and King's College Hospital, London, UK.
authors.forename: P K
authors.initials: PK
authors.lastname: McGuire
authors.forename: P
authors.initials: P
authors.lastname: Jones
authors.forename: I
authors.initials: I
authors.lastname: Harvey
authors.forename: P
authors.initials: P
authors.lastname: Bebbington
authors.forename: B
authors.initials: B
authors.lastname: Toone
authors.forename: S
authors.initials: S
authors.lastname: Lewis
authors.forename: R M
authors.initials: RM
authors.lastname: Murray
mesh_terms: D000208:Acute Disease; D000328:Adult; D002186:Cannabinoids / Q000493:pharmacokinetics; D005260:Female; D006801:Humans; D008297:Male; D008385:Marijuana Smoking / Q000009:adverse effects*; D008609:Mental Status Schedule; D010343:Patient Admission; D011569:Psychiatric Status Rating Scales; D011605:Psychoses, Substance-Induced / Q000175:diagnosis / Q000209:etiology*; D015813:Substance Abuse Detection
chemical_list: D002186:Cannabinoids