A randomised controlled trial of a psychoeducational group intervention for family and friends of young people with borderline personality disorder features.

Delivering MS-BPD in conjunction with an online psychoeducational intervention was not found to provide additional benefit over and above access to an online intervention alone. In accordance with national guidelines, carer interventions should be routinely offered by youth mental health services as part of early intervention programmes for borderline personality disorder. Further research is warranted into which interventions work for whom, carers' preferences for support and barriers to care.