Cariprazine as a maintenance treatment in dual schizophrenia: a 6-month observational study in patients with schizophrenia and cannabis use disorder

Schizophrenia is often associated with substance use disorders, particularly cannabis use disorder (CUD). However, treatments frequently fail to address both conditions simultaneously. This study aimed to evaluate the antipsychotic effectiveness of cariprazine in patients with both schizophrenia and CUD in a real-world setting. A 6-month observational study was conducted on 58 patients diagnosed with schizophrenia and CUD, treated with cariprazine. Antipsychotic effectiveness was measured using the Positive and Negative Syndrome Scale and the Clinical Global Impression-Schizophrenia Scale, along with the Improvement and Severity scales. Cannabis consumption and addiction severity were assessed using the Cannabis Abuse Screening Test and the Severity of Dependence Scale, while functioning was evaluated with the Sheehan Disability Inventory. Cariprazine treatment resulted in significant improvements in schizophrenia symptoms (Positive and Negative Syndrome Scale change: -47.88 points, P < 0.0001; Clinical Global Impression-Schizophrenia Scale change: -8.26 points, P < 0.0001). Cannabis use and dependence also decreased (Cannabis Abuse Screening Test change: -7.0 points, P < 0.0001; Severity of Dependence Scale change: -7.88 points, P < 0.0001), alongside improvements in functioning (Sheehan Disability Inventory change: -9.48 points, P < 0.0001). These results suggest that cariprazine is effective for both schizophrenia and CUD, though further research is needed to confirm these findings.