Introduction: Given that recovery‐oriented care focuses on empowering individuals with mental health challenges, collaborative care can be an effective tool for nurses in mental health day hospitals.Aim: To deepen knowledge about the impact of collaborative nursing care for improving health outcomes of mental health day hospital users.Methods: A sequential and transformative mixed methods study was designed. In the first phase of this mixed methods study, quantitative data were collected from 144 users of mental health day hospitals. In phase two, a group of users underwent an intervention based on collaborative nursing care, through participatory action research, and qualitative data were collected. Finally, quantitative data were again collected from all users.Results: The users who participated in the intervention group improved quantitatively in terms of the quality of the therapeutic relationship. They also improved at different stages of the recovery process, thus the qualitative results confirmed that collaborative nursing care was an essential component in their recovery process.Discussion: The findings highlight the critical role of collaborative nursing care in health outcomes. The therapeutic relationship was identified as a key factor in facilitating patient empowerment.Implications: The study supports implementing collaborative nursing care models in mental health settings to enhance patient outcomes.Trial Registration: ClinicalTrials.gov identifier: NCT04814576

Background/Objectives: This study explores the perspectives of mental health professionals on tailoring the Mentis Plus intervention to enhance positive mental health (PMH) in individuals experiencing First-Episode Psychosis (FEP). Although the Mentis Plus Program has been previously implemented in other contexts, it has not yet been applied to FEP care. Therefore, this study aimed to adapt the intervention for future implementation through expert consultation. Methods: A qualitative exploratory-descriptive design was employed. Data were collected via three focus groups comprising multidisciplinary professionals experienced in FEP care. Qualitative content analysis was used to examine the data. Results: Participants viewed the tailored Mentis Plus intervention as a valuable, recovery-oriented tool. Key recommendations included a flexible, group-based format with eight weekly sessions. Suggested intervention components encompassed gratitude journaling, emotional regulation techniques, and collaborative problem-solving exercises. Group delivery was highlighted as essential for mitigating isolation and promoting peer support. Practical implementation strategies included phased session structures and routine emotional check-ins. Identified barriers to implementation included the need for specialized training, limited therapeutic spaces, and the heterogeneity of participant needs. Facilitators included a person-centered approach, institutional backing, and sufficient resources. Conclusions: The findings support the feasibility and clinical relevance of a tailored Mentis Plus FEP Program—Brief Version. Expert-informed insights provide a foundation for adapting mental health interventions to early-psychosis care and inform future research and implementation strategies.