Therapy is a term used to describe a wide variety of interactive programs offered by mental health professionals to mitigate personality disorder symptoms.
Personality disorders are notoriously difficult to treat and are sometimes even avoided by some mental healthcare professionals. The most effective strategies involve an intense process of individual and group therapy extending over a number of years, often shored-up with medication. This requires a serious, sustained commitment on the part of the PD sufferer to their own recovery.
Some therapists avoid patients with certain kinds of personality disorders because of the risk to themselves and their practice. PDI's are not good at respecting the professional and personal boundaries of therapists and can become just as demanding to a therapist as they are to the others in their lives.