Objective: Our goal was to reduce the prevalence of antipsychotic medication side-effects by providing a short-term training program on the assessment and management of side-effects to case managers. Method: Forty-four patients in receipt of community-based mental health services were allocated to comparison (n = 20) and intervention (n = 24) groups based on the health service district in which they resided. While case managers working with the intervention group attended a short-term training program to improve their assessment and management of neuroleptic side-effects, case managers providing services to the comparison group received no additional training. Side-effects were assessed pre- and postintervention using the Liverpool University Neuroleptic Side-effect Rating Scale (LUNSERS). Results: A reduction in the overall prevalence of side-effects in both groups was observed, however, only those patients in the intervention group reported a statistically significant reduction in mean side-effect scores between the pre- and post-measures (Wilcoxon Matched Pairs Signed-ranks Test, z = −2.8411, two-tailed, p < 0.01). In addition, qualitative data collected during the second survey revealed that patients in the intervention group had acquired some positive management strategies for dealing with unwanted side-effects. The strategies were elicited from eight different patients distributed across six of the 12 case managers who took part in the training program. Conclusions: Training cases managers in the assessment and management of side-effects may help to reduce their impact on the lives of people prescribed neuroleptic medication.