Sociodemographic and clinical characteristics of patients presenting with first-episode psychosis and concurrent substance misuse.

Aims: To determine the incidence of concurrent substance misuse among individuals entering first-episode psychosis treatment, and examine whether patients with concurrent substance misuse differ on variables relevant to service planning.

Methods: Consecutive patients (n=376) were assessed using standardized instruments.

Results: Twenty-two per cent met abuse or dependence criteria for a single substance, and 8% met criteria for two substances.