IPT vs Prolonged Grief Disorder Treatment (PGDT/CGT)
A side-by-side comparison: mechanism, evidence, the conditions each treats, philosophical roots, and where they actually disagree clinically.
At a glance
IPT
- Tradition
- Integrative
- Founder
- Klerman / Weissman (1984)
- Evidence
- Guideline-recommended
- Focus
- Relational + Skill
- Format
- Individual
- Duration
- Short (12-16)
Prolonged Grief Disorder Treatment (PGDT/CGT)
- Tradition
- Integrative
- Founder
- M. Katherine Shear (2005)
- Evidence
- Guideline-recommended
- Focus
- Processing + Restoration
- Format
- Individual
- Duration
- 16 sessions
How they work
IPT
Core mechanism: Improving interpersonal functioning in one of four problem areas (grief, disputes, transitions, deficits) alleviates depression
Ontology: Depression occurs in an interpersonal context; improving relationships and social roles improves mood
Prolonged Grief Disorder Treatment (PGDT/CGT)
Core mechanism: Revisiting the death narrative integrates the reality of loss + imaginal conversations transform the continuing bond + restoration goals rebuild engagement with life
Ontology: Prolonged grief as a failure of natural adaptation: the attachment system cannot update to accommodate the permanence of loss, leaving the bereaved stuck between wanting the person back and knowing they are gone
Conditions treated
1 shared · 3 IPT-only · 0 Prolonged Grief Disorder Treatment (PGDT/CGT)-only
Both treat
Only IPT
What each assumes — and misses
IPT
Philosophical roots: Sullivan (interpersonal psychiatry: personality is the pattern of interpersonal situations); Meyer (psychobiology); Durkheim (social integration and anomie); Bowlby (attachment/loss)
Blind spots: Focused scope (4 problem areas) may miss broader personality patterns; less suited for complex or chronic presentations
Therapeutic voice: It sounds like this grief hasn't had a place to go since your mother died. Let's make room for it here.
Prolonged Grief Disorder Treatment (PGDT/CGT)
Philosophical roots: Bowlby (attachment); Shear (complicated grief as attachment disorder); Foa (emotional processing applied to grief); Klass & Silverman (continuing bonds); Stroebe & Schut (dual process model, source of the loss-oriented and restoration-oriented halves of the protocol); Worden (task model of mourning); DSM-5-TR nosology
Blind spots: Revisiting exercises may feel coercive for clients whose culture doesn't value explicit grief narration; the highly structured protocol may not suit every grieving style; much less evidence for non-death losses than for bereavement; 16-session format may be insufficient for losses compounded by other traumas; PGD diagnosis itself is debated as potentially pathologizing normal grief
Therapeutic voice: I'd like you to close your eyes and tell me the story of the day he died. Start a little before you knew, and tell it as though it's happening now, in the present tense. We'll go about ten minutes. I'm recording it so you can listen at home, and I'm right here the whole time.
Choosing between them
IPT and Prolonged Grief Disorder Treatment (PGDT/CGT) both sit within the Integrative tradition — they share a worldview about what suffering is and how change happens. Differences are more often about technique and emphasis than about underlying theory.
For deeper coverage: see the full IPT and Prolonged Grief Disorder Treatment (PGDT/CGT) pages, or use the interactive comparison tool to add more modalities to this comparison.