title: Prevalence of Substance Use in People With First-Episode Psychosis.
abstract: OBJECTIVE
  People experiencing a first episode of psychosis often have co-occurring substance use, which increases risk of prolonged psychosis and impairs recovery. This article examines the prevalence of substance use in people with first-episode psychosis.
  
  
  METHODS
  The authors searched MEDLINE and other databases for articles published between 1990 and 2009 that described current or lifetime prevalence of substance use, misuse, abuse, or dependence in individuals with first-episode psychosis.
  
  
  RESULTS
  Forty-four unique studies provided information. More than 25% of individuals with first-episode psychosis in reviewed studies indicated current or lifetime alcohol use, lifetime alcohol abuse/dependence, current or lifetime cannabis use, or lifetime cannabis abuse or dependence. For all substances, lifetime prevalence of abuse/dependence was higher than current abuse/dependence.
  
  
  CONCLUSIONS
  Despite variation in assessment methods, findings were generally consistent. Individuals with first-episode psychosis have lower current substance prevalence than lifetime prevalence, suggesting cessation of some substance use prior to seeking treatment for psychosis.
authors.affiliation: a Columbia University and New York State Psychiatric Institute , New York , New York , USA.
authors.forename: Jennifer P
authors.initials: JP
authors.lastname: Wisdom
authors.affiliation: a Columbia University and New York State Psychiatric Institute , New York , New York , USA.
authors.forename: Jennifer I
authors.initials: JI
authors.lastname: Manuel
keywords: co-occurring disorders; first-episode psychosis; schizophrenia; systematic review