Psychosocial interventions are vital in treating severe mental illness, yet their use remains limited, and patients often lack adequate information about them. Patient-focused versions of clinical guidelines are designed to enhance mental health literacy and inform patients about available treatments, but these resources are underutilized. This study evaluated the impact of implementing a patient-focused psychosocial intervention guideline on empowerment, knowledge, and use of psychosocial interventions among individuals with severe mental illness.

Multicentre, cluster-randomised trial. The study population comprised adult patients with a severe mental disorder. The intervention group received a multimodal, structured, and protocol-led patient-focused guideline implementation, whereas the control group received treatment as usual. Data were analysed using hierarchical linear models. The primary outcome was the change in patients’ empowerment.

There was no significant intervention effect on empowerment (effect size=0.13, p=0.605), which increased slightly in both groups. The number of psychosocial interventions familiar to patients increased significantly more in the intervention group. Exploratory analyses suggest that patient empowerment could have been influenced by COVID-19-related stress, patient age, the severity of functional impairment, and migration background. The improvement in the utilisation of psychosocial interventions did not differ significantly between the intervention group (M=1.1, SD=2.5) and the control group (M=1.3, SD=2.4).

The implementation of a patient-focused psychosocial intervention guideline failed to enhance empowerment among service users. However, our analyses indicate that the intervention led to an improvement in patient knowledge with respect to guideline content. The availability of psychosocial interventions may have been significantly constrained by the COVID-19 pandemic.