Interpersonal psychotherapy (IPT) is a brief, attachment-focused psychotherapy that centers on resolving interpersonal problems and symptomatic recovery. It is an empirically supported treatment (EST) that follows a highly structured and time-limited approach and is intended to be completed within 12–16 weeks. IPT is based on the principle that relationships and life events impact mood and that the reverse is also true. It was developed by Gerald Klerman and Myrna Weissman for major depression in the 1970s and has since been adapted for other mental disorders. IPT is an empirically validated intervention for depressive disorders, and is more effective when used in combination with psychiatric medications. Along with cognitive behavioral therapy (CBT), IPT is recommended in treatment guidelines as a psychosocial treatment of choice, and IPT and CBT are the only psychosocial interventions that psychiatry residents in the United States are mandated to be trained for professional practice.
Originally named "high contact" therapy, IPT was first developed in 1969 at Yale University as part of a study designed by Gerald Klerman, Myrna Weissman and colleagues to test the efficacy of an antidepressant with and without psychotherapy as maintenance treatment of depression. IPT has been studied in many research protocols since its development. NIMH-TDCRP demonstrated the efficacy of IPT as a maintenance treatment and delineated some contributing factors.
IPT was influenced by CBT as well as psychodynamic approaches. It takes its structure from CBT in that it is time-limited, employs homework, and structured interviews and assessment tools.
The content of IPT's therapy was inspired by Attachment theory and Harry Stack Sullivan's Interpersonal psychoanalysis. Social theory is also influenced in a lesser role to emphasis on qualitative impact of social support networks for recovery. Unlike psychodynamic approaches, IPT does not include a personality theory or attempt to conceptualize or treat personality but focuses on humanistic applications of interpersonal sensitivity.