Cannabis and psychosis in acute psychiatric admissions

This study assessed the duration of admission and time to relapse in 62 acute psychiatric in‐patients who had urinary drug screens performed because of suspicion of illicit drug use. Some 51% of those with psychosis (n = 45) and 29% of those with non‐psychotic illness (n = 17) were THC‐positive although this was not significant. In those with recurrent admissions for psychosis tetrahydrocannabinol (THC)‐positive subjects were significantly younger. The duration of admission was 7 days shorter in the THC‐positive group but this was not significant. Their duration since last admission (rapidity of relapse) was 10 months versus 33 months which was significant.