from Part I - Treatment Strategies
Published online by Cambridge University Press: 19 October 2021
For many patients with schizophrenia, substance use predates the first psychotic episode. Patients suffering from their first psychotic break are more likely to be daily cannabis users and have a higher rate of tobacco use [1, 2]. Cannabis appears to exert a dose-dependent effect on the risk of developing a psychotic illness and illness onset is earlier [3]. Methamphetamine may increase the risk of schizophrenia on a par with cannabis [4]. Overall, 13–51% of patients entering treatment with their first psychotic episode have a co-occurring substance use disorder [5]. If substance use continues in parallel with a first-episode psychosis, patients fare more poorly in both the short and long terms.
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