title: Isotretinoin use and risk of depression, psychotic symptoms, suicide, and attempted suicide.
abstract: BACKGROUND
  It has been suggested that there is a causal association between isotretinoin therapy and the risk of depression, psychotic symptoms, suicide, and attempted suicide.
  
  
  OBJECTIVE
  To further investigate the proposed association between isotretinoin therapy and the risk of depression, psychotic symptoms, suicide, and attempted suicide using a formal study design.
  
  
  METHODS
  Large population-based cohort studies.
  
  
  METHODS
  The Canadian Saskatchewan Health Database and the United Kingdom General Practice Research Database.
  
  
  METHODS
  Data were analyzed for 7195 isotretinoin users and 13,700 oral antibiotic users with acne from the Canadian Saskatchewan Health Database and for 340 isotretinoin users and 676 oral antibiotic users with acne from the United Kingdom General Practice Research Database. All subjects had computer-recorded histories of between 6 months and 5 years before, and at least 12 months after, their first isotretinoin or antibiotic prescription.
  
  
  METHODS
  Prevalence rates of neurotic and psychotic disorders, suicide, and attempted suicide were compared between isotretinoin and antibiotic users and within isotretinoin users as their own comparison (pretreatment vs posttreatment). The results were expressed as relative risks, calculated using multiple logistic regression analyses.
  
  
  RESULTS
  Relative risk estimates, comparing isotretinoin use and oral antibiotic use with nonexposure to either drug for newly diagnosed depression or psychosis, were approximately 1.0 regardless of the data source. Similarly, relative risk estimates were all around 1.0 when comparing before with after isotretinoin use. The relative risk estimate for suicide and attempted suicide was 0.9 (95% confidence interval, 0.3-2.4) when comparing current isotretinoin exposure with nonexposure.
  
  
  CONCLUSIONS
  This study provides no evidence that use of isotretinoin is associated with an increased risk for depression, suicide, or other psychiatric disorders.
authors.affiliation: Boston Collaborative Drug Surveillance Program, 11 Muzzey St, Lexington, MA 02421, USA. sjick@bu.edu
authors.forename: S S
authors.initials: SS
authors.lastname: Jick
authors.forename: H M
authors.initials: HM
authors.lastname: Kremers
authors.forename: C
authors.initials: C
authors.lastname: Vasilakis-Scaramozza
mesh_terms: D000152:Acne Vulgaris / Q000188:drug therapy; D000293:Adolescent; D000328:Adult; D000900:Anti-Bacterial Agents / Q000009:adverse effects; D002648:Child; D015331:Cohort Studies; D003863:Depression / Q000139:chemically induced* / Q000453:epidemiology; D003879:Dermatologic Agents / Q000009:adverse effects*; D005260:Female; D006801:Humans; D015474:Isotretinoin / Q000009:adverse effects*; D008297:Male; D011618:Psychotic Disorders / Q000453:epidemiology / Q000209:etiology*; D012189:Retrospective Studies; D012307:Risk Factors; D013405:Suicide / Q000706:statistics & numerical data; D013406:Suicide, Attempted / Q000706:statistics & numerical data; D006113:United Kingdom
chemical_list: D000900:Anti-Bacterial Agents; D003879:Dermatologic Agents; D015474:Isotretinoin