title: Comorbidity of substance misuse and mental illness in community mental health and substance misuse services.
abstract: BACKGROUND
  Improved management of mental illness and substance misuse comorbidity is a National Health Service priority, but little is known about its prevalence and current management.
  
  
  OBJECTIVE
  To measure the prevalence of comorbidity among patients of community mental health teams (CMHTs) and substance misuse services, and to assess the potential for joint management.
  
  
  METHODS
  Cross-sectional prevalence survey in four urban UK centres.
  
  
  RESULTS
  Of CMHT patients, 44% (95% CI 38.1-49.9) reported past-year problem drug use and/or harmful alcohol use; 75% (95% CI 68.2-80.2) of drug service and 85% of alcohol service patients (95% CI 74.2-93.1) had a past-year psychiatric disorder. Most comorbidity patients appear ineligible for cross-referral between services. Large proportions are not identified by services and receive no specialist intervention.
  
  
  CONCLUSIONS
  Comorbidity is highly prevalent in CMHT, drug and alcohol treatment populations, but may be difficult to manage by cross-referral psychiatric and substance misuse services as currently configured and resourced.
mesh_terms: D000328:Adult; D003156:Community Mental Health Services / Q000458:organization & administration; D015897:Comorbidity; D003430:Cross-Sectional Studies; D003695:Delivery of Health Care / Q000458:organization & administration; D017831:Diagnosis, Dual (Psychiatry); D004739:England / Q000453:epidemiology; D005260:Female; D006801:Humans; D007400:Interprofessional Relations; D008297:Male; D001523:Mental Disorders / Q000453:epidemiology* / Q000628:therapy; D010348:Patient Care Team; D015995:Prevalence; D012017:Referral and Consultation; D019966:Substance-Related Disorders / Q000453:epidemiology* / Q000628:therapy; D014504:Urban Health / Q000706:statistics & numerical data