Effectiveness and safety of the adjunctive use of an internet-based self-management intervention for borderline personality disorder in addition to care as usual: results from a randomised controlled trial.

Importance: Borderline personality disorder (BPD) is a severe mental disorder that is often inadequately treated.

Objective: To determine if adding a self-management intervention to care as usual (CAU) is effective and safe.

Design: Randomised, controlled, rater-blind trial.