Abstract
Comorbid substance use is a major complication for people with schizophrenia and related disorders, with the most common drugs of abuse being nicotine, caffeine, alcohol, cannabis, and cocaine. Psychologists working in this area need to understand the broader effects of substance use on psychotic symptoms and psychosocial functioning and be able to assess this comorbidity, to help guide treatment plans and/or direct patients to appropriate services. Drawing on the international evidence base, this chapter will introduce readers to best practice in the screening and assessment of co-occurring substance use in people with psychosis, outline the strengths and limitations of available tools, and discuss the challenges involved in the assessment process.
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