Cannabis use predicts shorter duration of untreated psychosis and lower levels of negative symptoms in first-episode psychosis: a South African study

ABSTRACT

Objective: Cannabis use/abuse is a common co-morbid problem in patients experiencing a first episode of psychotic illness (FEP). The relationship between the clinical presentation of FEP and cannabis abuse is complex and warrants further investigation; especially within the South African context. Method: We tested associations between recent/current cannabis use and duration of untreated psychosis (DUP); age of onset (AO); PANSS-rated (Positive and Negative Syndrome Scale) positive; negative and general psychopathology symptoms and depressive symptoms (Calgary Depression Scale for Schizophrenia) in a sample of 54 patients with FEP. Results: Mean DUP was 34.4 weeks; while mean AO was 24.7 years. Co-morbid cannabis use occurred in 35of the sample and was significantly associated with shorter DUP (Mann-Whitney U; p=0.026). While not significant; there was also a trend association between cannabis use and lower negative symptoms (Mann-Whitney U; p=0.051). Conclusion: Current/recent cannabis use was associated with clinical features of psychosis onset that previously have been associated with better outcome. Medium and long-term outcome for cannabis users however; is likely to depend on whether or not cannabis use is ongoing