Early readmission to psychiatric units poses a significant challenge for both patients and healthcare institutions. It hampers patient progress and prognosis, and the professional approach taken during discharge can greatly influence the recovery process. This paper proposes a multicomponent discharge transition intervention to mitigate the risk of early readmission to a mental health hospitalization unit (MHHU). The present proposal consists of two distinct phases with two clearly differentiated main objectives. On the one hand, following an observational design, the development of a measurement instrument to assess patients’ risk of early readmission, allowing for stratification into the high-, medium-, and low-risk categories. On the other hand, according to a quasi-experimental design, the implementation and evaluation of the intervention program, with a focus on tailored interventions to ensure adherence and continuity of care post-discharge, with a more intensive approach for high-risk patients. A post-discharge psychotherapeutic group will also be introduced for high-risk cases to support recovery. The program’s effectiveness will be evaluated by comparing the early readmission rates at the Regional Hospital of Malaga’s MHHU to those of the previous year. Two other hospitals in the province, where the intervention is not applied, will serve as control groups. Success will also be measured through pre- and post-assessments of the recovery, functionality, subjective well-being, social support, and treatment satisfaction of those participating in the psychotherapeutic group. This proposal aims to address the issue of early readmission by enhancing predictability and understanding intervention strategies to reduce readmission rates.