BackgroundEpidemiological data on alcohol-induced psychotic disorder and delirium (alcohol-induced psychotic syndrome, AIPS) are scarce.AimsTo investigate the epidemiology of AIPS, the risk factors for developing AIPS among people with alcohol dependence, and mortality associated with alcohol dependence with or without AIPS, in a sample drawn from the general population of Finland.MethodA general population sample of 8028 persons were interviewed with the Composite International Diagnostic Interview and screened for psychotic disorders using multiple sources. Best-estimate diagnoses of psychotic disorders were made using the Structured Clinical Interview for DSM–IV Axis I Disorders and case notes. Data on hospital treatments and deaths were collected from national registers.ResultsThe lifetime prevalence was 0.5% for AIPS and was highest (1.8%) among men of working age. Younger age at onset of alcohol dependence, low socioeconomic status, father's mental health or alcohol problems and multiple hospital treatments were associated with increased risk of AIPS. Participants with a history of AIPS had considerable medical comorbidity, and 37% of them died during the 8-year follow-up.ConclusionsAlcohol-induced psychotic disorder is a severe mental disorder with poor outcome.