Interpersonal therapy (IPT) is a structured, short-term psychological treatment originally developed by Gerald Klerman and Myrna Weissman in the 1970s for the treatment of major depression. The IPT model is based on the assumption that interpersonal relationships profoundly influence mood, and that difficulties in social or emotional relationships may trigger, worsen, or maintain a depressive episode.
Unlike cognitive or behavioral therapy, IPT does not focus primarily on the patient’s thoughts or behaviors, but on social interactions and relational roles. Its central goal is to help the patient understand and address current interpersonal difficulties that contribute to distress, promoting symptom improvement by strengthening communication and relational skills.
IPT is based on a medical model of depression, in which the depressive episode is viewed as an episodic illness with environmental precipitants, often interpersonal in nature. Treatment focuses on the present and assumes that improving relationship quality and the management of social roles can significantly reduce depressive symptoms.
The main interpersonal factors that may contribute to depression and become central treatment targets are:
Each IPT course focuses on one or two of these themes, selected on the basis of the recent history and analysis of the patient’s current relational context. The intervention aims to strengthen adaptation to these events by improving the ability to communicate, negotiate, and manage role changes or losses.
IPT typically consists of 12–16 sessions, divided into three phases:
Therapy has a time- and content-limited focus, promotes patient empowerment, and uses a collaborative therapeutic relationship that is nevertheless directive, with the therapist taking an active role in defining and managing the course of treatment.
Interpersonal therapy is an evidence-based treatment for depression and focuses on grief, role disputes, transitions and interpersonal difficulties. The presence of a particular relational factor may guide the focus, but is not a validated predictor of superiority. It may be considered for patients who:
IPT is also effective in preventing relapse in recurrent depressive disorders. It has also been successfully adapted for specific populations such as adolescents, older people, and patients with depression during pregnancy or postpartum.
Numerous clinical studies and meta-analyses confirm the efficacy of IPT in reducing depressive symptoms, with outcomes comparable to CBT and pharmacotherapy in mild and moderate depression. The intervention has also proved particularly useful in outpatient and primary-care settings.
Interpersonal therapy is one of the psychotherapies supported by evidence for depression, but is not the mandatory or preferential treatment at every level of severity; it should be selected according to needs, preferences, availability and clinical features.
Recognition of a link between symptoms and relational events may facilitate formulation of the focus, but is not a validated predictor of greater efficacy. Increased perceived support, greater assertiveness and reduced isolation are possible, not necessary, outcomes.
Interpersonal therapy is a brief, structured, scientifically grounded treatment that places relationship quality and adaptation to social change at the center of recovery from depression. Its efficacy, flexibility, and applicability across different stages of life make it a valuable resource in specialist clinical practice and outpatient care.
At a time when depressive suffering is often linked to isolation, loneliness, or crises in emotional bonds, IPT offers a therapeutic space oriented toward restoring meaningful relational connections and the ability to face change with greater balance and confidence.