A manual-based form of psychodynamic therapy (PT), labeled dynamic deconstructive psychotherapy, has been developed for particularly challenging patients with BPD, especially those with co-occurring substance use disorders. It aims to remediate specific neurocognitive capacities that are responsible for processing of emotional experiences, and so diminishes symptoms of BPD and promotes the development of a coherent and differentiated self-structure. PT has been shown to be helpful for BPD, but has not been tested for people who have BPD with co-occurring substance use disorders.