A Systematic Review of Clinical Phenomenology, Differential Diagnosis and Prognostic Outcomes of Substance-Induced Psychotic Disorders.
Valerio Ricci, Giovanni Martinotti, Giuseppe Maina
The International journal of social psychiatry April 26, 2026 Peer reviewed DOI: 10.1177/00207640261439774 via PubMed
Summary
Distinguishing substance-induced psychotic disorders from primary psychotic disorders with substance use is a diagnostic challenge. A systematic review of 36 studies with over 80,000 individuals found that cannabis-induced psychosis shows prominent positive symptoms, preserved negative domains, and elevated affective and anxiety features, with 36% to 46% transitioning to schizophrenia spectrum disorders.
Study at a glance
| Design | systematic review |
|---|---|
| Sample size | 80,000 |
| Population | individuals with substance-induced psychotic disorders |
| Key finding | Cannabis- and methamphetamine-induced psychoses show distinctive phenomenological signatures, but substantial overlap with primary psychotic disorders and diagnostic conversion rates of 25% to 39% underscore the need for longitudinal monitoring. |
Abstract
Distinguishing substance-induced psychotic disorders (SIPD) from primary psychotic disorders with concurrent substance use remains a critical diagnostic challenge for treatment planning and prognostic counseling. To systematically review the clinical phenomenology of SIPD, identify distinguishing symptom patterns, and examine relationships between phenomenology and outcomes. A systematic search of PubMed, PsycINFO, and Web of Science (1990-2025) was conducted for studies examining clinical characteristics of SIPD using standardized diagnostic criteria and validated instruments. Study quality was assessed using the Newcastle-Ottawa Scale. The review was registered on PROSPERO (CRD42025123563; 19/11/2025). Thirty-six studies encompassing over 80,000 individuals were included. Cannabis-induced psychosis was consistently characterized by prominent positive symptoms, preserved negative domains, and elevated affective and anxiety features, with transition rates to schizophrenia spectrum disorders ranging from 36% to 46%. Methamphetamine-induced psychosis presented along a phenomenological gradient, from simple persecutory delusions and tactile hallucinations in transient cases-accompanied by markedly elevated violence rates (75.6%)-to complex multimodal sensory disturbances in persistent presentations. Despite these substance-specific signatures, substantial phenomenological overlap with primary psychotic disorders and poor diagnostic stability, with 25% to 39% of initial SIPD diagnoses converting to primary disorders over follow-up, limit the utility of cross-sectional assessment alone. Superior antipsychotic response at lower doses emerged as a potential marker favoring substance-induced over primary etiology. SIPD exhibit distinctive phenomenological signatures varying by substance class, yet considerable overlap with primary psychotic disorders and poor diagnostic stability underscore the necessity of longitudinal monitoring and integrated psychiatric-addiction care.