Evidence from a systematic literature review of 47 studies (38 including patients with bipolar disorder, and 9 including relatives of patients with bipolar disorder), suggests that psychoeducation of patients and family members is associated with a lower number of new mood episodes, and a reduction in the number and length of hospitalizations.3

References:
1. Smith D, Jones I, Simpson S. Psychoeducation for bipolar disorder. Adv Psychiatr Treat 2010; 16 (2): 147–154.
2. Salcedo S, Gold AK, Sheikh S, et al. Empirically supported psychosocial interventions for bipolar disorder: current state of the research. J Affect Disord 2016; 201: 203–214.
3. Rabelo JL, Cruz BF, Ferreira JDR, et al. Psychoeducation in bipolar disorder: a systematic review. World J Psychiatry 2021; 11 (12): 1407–1424.