In a recent study of dosing in a heterogeneous psychiatric outpatient population (2), we observed that 32% of patients were treated with antipsychotics at dosages classified as “excessive,” because they exceeded by 1.5 times the designated daily dose (DDD) defined by the World Health Organization. To better understand this potential concern, we compared dosing of patients treated by psychiatrists and those treated by general practitioners, because these professionals may differ in their dosing strategies (3). We therefore expanded our analysis to compare prescription patterns of the two groups, as well as characteristics of the prescribers themselves. The patient population and methods were described previously (2); the protocol was approved by the University of British Columbia Research Ethics Board. A total of 406 patients, who provided written informed consent, were recruited from community mental health teams in Vancouver, British Columbia, between October 2005 and October 2006. Antipsychotic dosing was compared by converting to chlorpromazine equivalent (CE) doses, because we have shown that DDDs are unreliable predictors of extrapyramidal symptoms (4). Data about prescribers were obtained through the British Columbia Medical Association. Statistical analyses included chi square tests and analysis of variance.