Prolonged Exposure (PE) Therapy

1. Overview

What PE Is

Prolonged Exposure is a specific, manualized form of trauma-focused cognitive behavioral therapy. It identifies avoidance as the central maintainer of PTSD and treats avoidance directly. Two principal forms of exposure are interleaved across the protocol: imaginal exposure (revisiting the trauma memory in the office) and in vivo exposure (approaching trauma-related but objectively safe situations in everyday life). Education, breathing retraining, and processing of the exposure experience round out the treatment.

The Logic of Exposure

For many PTSD sufferers, the trauma is intrusively re-experienced and simultaneously avoided — the memory pushes itself into awareness and is immediately pushed away. Daily life is similarly organized around avoidance of places, people, sensations, and topics that trigger trauma reminders. Avoidance offers short-term relief but prevents the memory from being integrated and prevents the reminders from being relearned as safe. PE intervenes by gently, deliberately, repeatedly approaching what has been avoided, in a way the survivor can tolerate, until the emotional charge subsides on its own.

The Patient's Active Role

PE is not a passive treatment. The client engages directly with their most difficult memory and with the situations they have been avoiding. Between sessions, the client listens to recordings of imaginal exposure, completes in vivo assignments, and tracks their experience. The therapist provides expert guidance, encouragement, and pacing — but the central work is done by the client.

The Trajectory

Most clients experience intense emotional activation during the first few imaginal exposures. Subjective distress ratings during exposure typically decrease across repetitions within a session and across sessions over the course of treatment. Outside of session, the most reliable signs of improvement are reduced avoidance, fewer intrusions, and a sense that the memory now belongs to the past rather than continuously bleeding into the present.

2. Historical Origins

Edna Foa and the Center for the Treatment and Study of Anxiety

Edna Foa, an Israeli-American clinical psychologist trained at the University of Illinois and a longtime researcher at the University of Pennsylvania, has been one of the most influential figures in anxiety and PTSD treatment for more than four decades. Her Center for the Treatment and Study of Anxiety at Penn became one of the world's leading sites for the development and dissemination of exposure-based therapies.

From OCD to Rape Trauma

Foa's early work focused on exposure and response prevention for obsessive-compulsive disorder, where she helped establish exposure as the active ingredient in effective OCD treatment. In the 1980s, she turned her attention to rape-related PTSD, applying and adapting exposure principles to this distinct clinical problem. The first studies of what would become PE appeared in the late 1980s and early 1990s.

Formalization of the Protocol

Through a series of randomized trials, Foa and colleagues refined the PE protocol, comparing it to stress inoculation training, cognitive processing therapy, and supportive counseling. The treatment manual was published in 1998 (Treating the Trauma of Rape) and updated in subsequent editions, with a clinician's guide and a client workbook (Reclaiming Your Life from a Traumatic Experience) published in the 2000s.

Dissemination Through the VA and DoD

Beginning in the mid-2000s, the U.S. Department of Veterans Affairs initiated a national rollout of PE training for VA clinicians, alongside Cognitive Processing Therapy. This dissemination effort — among the largest training initiatives ever undertaken for an evidence-based psychotherapy — significantly expanded access to PE for veterans with combat-related PTSD and established PE as one of the two primary PTSD treatments in the VA system.

International Spread

PE has been translated into multiple languages and tested across populations including survivors of sexual assault, motor vehicle accidents, terrorism, combat, refugee trauma, childhood abuse, and natural disasters. Training is offered through the Center for the Treatment and Study of Anxiety, the VA's national training program, and authorized international trainers.

Recognition

Foa was named to the TIME 100 list of most influential people in 2010 in recognition of her work. PE itself remains one of the most rigorously studied psychotherapies in any field, with an evidence base spanning decades and continents.

3. Theoretical Foundations

Emotional Processing Theory

The theoretical core of PE is emotional processing theory, articulated by Foa and Michael Kozak in the 1980s. The theory holds that fear is represented in memory as a network of associations between stimuli, responses, and meanings. In PTSD, this fear network is unusually broad (many situations have come to trigger it), unusually intense (small triggers produce strong responses), and unusually distorted (objectively safe situations are coded as dangerous). For the network to change, two conditions are necessary: the network must be activated (the client must contact the emotion), and information incompatible with the network must be present (the client must experience that the feared outcome does not occur, that the memory can be tolerated, and that emotion subsides on its own).

Habituation and Inhibitory Learning

The original PE model emphasized within-session and between-session habituation — the decrease in physiological and subjective distress with repeated exposure. More recent theoretical work, particularly by Michelle Craske and colleagues, has refined the model in terms of inhibitory learning. In this view, the original fear learning is not erased; instead, new safety learning is developed that competes with and inhibits the fear learning. Effective exposure is designed to maximize this new learning. The practical PE protocol largely retains its original form, but contemporary trainers integrate inhibitory learning principles.

Avoidance as the Maintaining Mechanism

PE treats avoidance — both behavioral (avoiding situations) and cognitive/emotional (avoiding thoughts, feelings, memories) — as the central process maintaining PTSD. Avoidance prevents the fear network from being activated in a corrective way and prevents the survivor from learning that the avoided material can be tolerated. Treatment systematically reverses avoidance.

Cognitive Change Through Behavioral Engagement

Although PE is not primarily a cognitive therapy, cognitive change is a major outcome. Through exposure, clients revise beliefs such as I cannot handle remembering this, the world is completely dangerous, or remembering will destroy me. These belief revisions emerge from behavioral evidence rather than from direct cognitive disputation, though processing discussions during sessions support the cognitive shift.

The Distinction from Flooding

PE is sometimes confused with flooding — a more aggressive earlier exposure approach in which the client is exposed to maximum-intensity fear stimuli at once. PE, by contrast, is graduated, paced, collaborative, and accompanied by careful preparation, processing, and psychoeducation. The intensity emerges from the trauma material itself, not from artificial maximization.

4. How a Typical Course Works

Pre-Treatment Assessment

Before beginning PE, the therapist conducts a thorough assessment to confirm PTSD, identify any comorbidities or risk factors, and ensure that exposure is appropriate at this time. Baseline measures (such as the PCL-5 for PTSD symptoms) are collected and tracked throughout treatment. Clients with active suicidality, untreated psychosis, severe substance dependence, or ongoing trauma exposure may need stabilization before PE begins.

Session 1: Orientation and Information Gathering

The first session, typically 90 minutes, introduces the rationale and overview of PE, gathers information about the trauma history and current symptoms, and identifies the index trauma — the specific event that will be the focus of imaginal exposure. The client is introduced to breathing retraining, a brief calming skill used outside of sessions.

Session 2: Psychoeducation and Initial Planning

Session two covers common reactions to trauma (normalizing reactions the client may have been pathologizing), introduces the rationale and procedure for in vivo exposure, and begins constructing the in vivo hierarchy — a list of avoided but safe situations rank-ordered by anticipated distress.

Session 3: First Imaginal Exposure

The third session introduces imaginal exposure. The client recounts the trauma in first person, present tense, with eyes closed, in as much detail as they can manage. The recounting typically lasts 30 to 45 minutes and is repeated several times within the session if time allows. The session is audio-recorded so the client can listen to it daily between sessions. Subjective Units of Distress (SUDS) are tracked throughout. Processing — discussion of what arose during exposure — follows.

Sessions 4–10: Continued Exposure and Processing

The middle phase of treatment continues weekly imaginal exposure to the index trauma, working successively through in vivo assignments, and processing each. As the client's distress around the original recounting subsides, the imaginal exposure may shift to hot spots — the most disturbing moments of the trauma — for more focused work. In vivo assignments progress up the hierarchy.

Sessions 11–15: Consolidation and Termination

Later sessions consolidate gains, address any remaining hot spots, complete higher items on the in vivo hierarchy, and prepare for treatment end. Final sessions include a review of progress, relapse prevention planning, and identification of any remaining issues that may need ongoing attention.

Variations in Length and Pacing

The standard protocol is 8 to 15 sessions, with most clients completing in 10 to 12. Twice-weekly delivery is common and well-supported. Massed PE — completing the protocol within one to three weeks — has been tested particularly in military and veteran populations and is increasingly available in intensive outpatient programs.

5. Core Techniques

Imaginal Exposure

The central technique of PE is imaginal exposure. The client closes their eyes and recounts the trauma in first person and present tense, including sensory details (what they saw, heard, smelled, felt in their body), thoughts at the time, and emotions. The recounting is repeated multiple times within a session, typically with the therapist asking the client to rate distress periodically. As repetition continues, distress ratings typically decline. The recounting is audio-recorded and the client listens to it daily between sessions.

Hot Spots

As the global recounting becomes less distressing, the therapist often narrows focus to hot spots — the specific moments of the trauma that remain most disturbing. The client revisits these moments in particular detail, often slowing down to walk through brief portions repeatedly. Hot-spot work commonly produces the largest gains in the middle phase of treatment.

In Vivo Exposure

In vivo exposure consists of approaching real-world situations, places, sensations, or activities that have come to feel dangerous because they remind the client of the trauma but are objectively safe. Examples might include driving past the location of an assault, attending crowded events, watching a movie that contains trauma-related material, or being in a relationship at a level of intimacy that has been avoided. Assignments are negotiated collaboratively, ordered by anticipated distress, and assigned for repeated practice between sessions.

Breathing Retraining

A brief diaphragmatic breathing skill is introduced early in treatment as a way to manage acute distress between sessions and in everyday life. It is explicitly not used during imaginal exposure (which is supposed to elicit emotion, not suppress it). Breathing retraining is a small component of PE and not the active ingredient.

Processing

After each imaginal exposure, the therapist and client discuss what arose — emotions, memories, insights, beliefs that surfaced. Processing supports cognitive integration and helps the client articulate the shifts that exposure is producing. Although less elaborated than the cognitive worksheets of CPT, the processing component of PE is essential and skilled.

Self-Monitoring

Clients track between-session activities: in vivo exposures completed, distress ratings before and after, listening to imaginal exposure recordings, and any other relevant data. Monitoring supports adherence, reveals avoidance patterns, and provides material for in-session discussion.

Common Patient Concerns and Therapist Responses

A common patient concern is that imaginal exposure will be retraumatizing or will make symptoms worse. The honest response, well-supported by research, is that exposure typically produces a temporary intensification of distress around the trauma material, particularly in early sessions, followed by sustained improvement. Long-term outcomes are robustly favorable. The brief intensification is not retraumatization; it is the activation necessary for the fear network to be modified. Skilled therapists prepare clients carefully, address ambivalence directly, and pace exposure to be tolerable.

6. Conditions It Treats and Evidence Base

PTSD: The Core Indication

PE has been tested in dozens of randomized controlled trials across diverse populations: survivors of sexual assault, combat veterans, refugees, motor vehicle accident survivors, survivors of terrorist attacks, childhood abuse survivors, and survivors of natural disasters. Across these trials, PE consistently produces large effect sizes for PTSD symptom reduction and substantial proportions of clients who no longer meet PTSD diagnostic criteria after treatment. Effects are typically durable, maintained at 6-month, 12-month, and longer follow-ups.

Co-occurring Depression

PTSD and depression frequently co-occur, and PE produces clinically meaningful reductions in depression symptoms alongside PTSD symptoms. This is consistent with the substantial overlap between trauma-related cognitive patterns and depressive cognition.

Comorbid Substance Use

Historically, comorbid substance use was treated as a contraindication for PE. More recent research, including studies of integrated treatments such as Concurrent Treatment of PTSD and Substance Use Disorders Using PE (COPE), has shown that PE can be safely delivered alongside or in coordination with substance use treatment, with meaningful improvements in both domains.

PE for Adolescents

PE has been adapted for adolescents (PE-A), with developmentally appropriate modifications including more psychoeducation, more involvement of caregivers in certain elements, and greater attention to peer and school contexts. Randomized trials support the efficacy of PE-A in adolescent PTSD.

Massed PE for Veterans

Compressed delivery formats — typically the full PE protocol delivered over two weeks in an intensive outpatient setting — have been tested in military and veteran populations with positive results. Outcomes are comparable to standard weekly delivery, with the practical advantage of faster symptom relief and reduced dropout from extended weekly treatment. Intensive outpatient programs offering massed PE have proliferated, particularly for combat-related PTSD.

Comparative Evidence

Head-to-head trials of PE and CPT have generally found the two treatments produce comparable outcomes, with neither showing consistent superiority. PE has also been compared favorably to medications, supportive therapy, and waitlist controls. The treatment is sometimes preferred over CPT for clients whose primary symptom is avoidance and intrusive re-experiencing; CPT may be preferred for clients whose primary distress is around the meanings of the trauma.

What PE Has Not Been Shown to Treat

PE is not a treatment for primary substance use disorders, primary psychotic disorders, primary personality disorders, or relationship problems independent of trauma. While it is increasingly used in clients with complex PTSD, the evidence base in classical PTSD is stronger; in complex presentations, PE may be augmented with skills training, stabilization, or other approaches.

7. Comparison with Other Therapies

PE vs. CPT

Prolonged Exposure and Cognitive Processing Therapy are the two PTSD treatments most heavily disseminated in the United States, both supported by extensive randomized trial evidence. PE focuses primarily on the memory and avoidance — repeated engagement with the trauma narrative and graduated approach to avoided situations. CPT focuses primarily on the beliefs the trauma produced — cognitive worksheets to identify and revise stuck points. Head-to-head trials generally show comparable outcomes. Clients differ in preference: some find direct re-engagement with the memory more bearable and effective; others find structured cognitive work more bearable and effective. Clinically, both are reasonable first-line options.

PE vs. EMDR

EMDR uses bilateral stimulation while the client holds aspects of the trauma in mind, with a different theoretical framework (adaptive information processing). Comparative trials generally find PE and EMDR roughly comparable for PTSD outcomes. PE includes between-session listening and explicit in vivo exposure assignments; EMDR generally has less between-session homework. Choice often comes down to client preference, therapist availability, and clinical fit.

PE vs. Trauma-Focused CBT (TF-CBT)

TF-CBT is a separate protocol developed primarily for children and adolescents and incorporating family involvement. PE-A is an adapted version of PE for adolescents that is more individual-focused. The treatments share core exposure principles but differ in age range, family integration, and protocol structure.

PE vs. Medication

SSRIs (particularly sertraline and paroxetine, both FDA-approved for PTSD) and SNRIs are common medication choices for PTSD. Head-to-head comparisons of PE and medication generally favor PE on PTSD-specific outcomes, with PE producing larger effect sizes and more durable gains. Combination of PE with medication is common and can be appropriate; medications alone tend to produce smaller gains than evidence-based psychotherapy.

PE vs. Brainspotting or Somatic Approaches

Brainspotting, somatic experiencing, and related body-based approaches have a much smaller evidence base than PE. They may appeal to clients who prefer non-verbal, body-based work or who have not tolerated exposure-based treatment, but they cannot currently claim equivalence in empirical support. Some clinicians integrate elements, though the evidence for combination approaches is limited.

PE vs. Present-Centered Therapy

Present-Centered Therapy is a supportive, problem-solving approach used as an active comparison in many PTSD trials. PE consistently outperforms PCT on PTSD-specific outcomes, though PCT itself produces meaningful improvement and is a reasonable option for clients who decline trauma-focused work.

8. Who Provides It and How to Find a Therapist

Training Pathway

PE training typically involves a four-day workshop followed by case consultation on supervised cases. The Center for the Treatment and Study of Anxiety at the University of Pennsylvania is the primary developer-affiliated training site. The VA has its own national training program for VA clinicians. PE certification, where offered, generally requires completion of training plus demonstration of competence on supervised cases.

Who Delivers PE

PE is delivered by licensed mental health clinicians — psychologists, social workers, counselors, marriage and family therapists, psychiatrists, and psychiatric nurses — who have completed formal PE training. Fidelity to the manual is important; outcomes are weaker when PE is delivered with significant deviations.

Where to Find a PE Therapist

VA-eligible veterans can access PE through the VA system. Many community mental health agencies, university clinics, and private practices offer PE. Directories maintained by the Center for the Treatment and Study of Anxiety and other professional bodies list trained clinicians. Useful questions when evaluating a provider include:

• Have you completed formal PE training and case consultation?
• How many full PE cases have you delivered?
• Are you comfortable working with my specific trauma type?
• Do you offer twice-weekly or massed PE?
• How do you handle symptom intensification during early sessions?

Cost and Access

PE is typically priced as standard psychotherapy in the clinician's region, with insurance coverage depending on license and network status. In the United States, VA-eligible veterans can access PE at no charge through the VA. Intensive outpatient programs offering massed PE are increasingly available, sometimes covered by insurance, sometimes private pay.

Telehealth PE

PE can be delivered effectively over secure video, expanding access to clients in rural or underserved areas. Some clinicians prefer in-person delivery for the first imaginal exposure to facilitate close monitoring, then transition to telehealth.

9. Limitations and Criticisms

Engagement Challenge

The central clinical challenge of PE is engagement. Avoidance is itself a core symptom of PTSD; asking the client to repeatedly engage with what they most want to avoid runs directly against the symptom that brought them to treatment. Clients commonly experience intense ambivalence — wanting to feel better, dreading the work required. Skilled therapists invest substantially in motivation, rationale, and pacing; less skilled clinicians may push prematurely or capitulate to avoidance.

Temporary Symptom Intensification

It is common in the early weeks of PE for some symptoms — intrusions, sleep disturbance, emotional reactivity — to intensify before improving. While research consistently shows long-term improvement, the short-term intensification is real and can be discouraging. Clients need to be prepared and supported through this phase.

Dropout

PE has a non-trivial dropout rate, particularly in the first several sessions. Strategies to retain clients include thorough preparation, addressing ambivalence directly, twice-weekly delivery (which appears to reduce dropout in some studies), and massed formats.

Complex PTSD

Complex PTSD — arising from prolonged or repeated interpersonal trauma — involves features beyond classical PTSD: emotion dysregulation, disturbances in self-organization, relational difficulties. PE was developed primarily for classical PTSD; in complex presentations it may be augmented with stabilization, skills training (such as STAIR), or other approaches. There is active debate about whether trauma-focused treatment should be delivered earlier or later in complex cases; current evidence supports introducing trauma-focused work earlier than was once thought, with appropriate stabilization.

Active Trauma

PE generally assumes the trauma has ended. For clients in ongoing trauma — domestic violence, active combat, ongoing political persecution — stabilization and safety planning take priority. Exposure to a memory of trauma that is still occurring rarely makes sense.

Severe Dissociation

Significant dissociation during imaginal exposure can prevent the emotional engagement necessary for processing. Clients with severe dissociative symptoms may need dissociation-focused preparatory work before PE, or may benefit from approaches more explicitly designed for dissociation.

Therapist Variability

PE outcomes depend on therapist skill in conducting imaginal exposure, processing the experience, structuring in vivo work, and managing avoidance. Therapists who deliver the protocol mechanically or who allow client avoidance to dominate sessions tend to produce weaker outcomes.

Cultural Considerations

Detailed first-person recounting of the trauma may be less culturally acceptable in some contexts. Cultural adaptations have been developed for several settings, but unadapted application of PE may not fit every client or community.

10. What to Expect in Your First Sessions

Before You Start

Most PE therapists will conduct an initial assessment session to confirm the diagnosis, gather trauma history, screen for issues that may need attention first (active suicidality, severe substance dependence, untreated psychosis, ongoing trauma), and orient you to the protocol. Expect direct discussion of the rationale for exposure — therapists who skip this step often lose clients early.

The First Session

Session one focuses on orientation and information gathering. The therapist will explain the rationale of PE, ask about the trauma history at a survey level, identify the index trauma (the event that will be the focus of imaginal exposure), and introduce breathing retraining. You will not yet do imaginal exposure.

The Second Session

Session two covers common reactions to trauma — a normalizing review of symptoms many trauma survivors experience — introduces the rationale and procedure for in vivo exposure, and begins constructing your in vivo hierarchy. The hierarchy is a working list of safe but avoided situations, rank-ordered by how much distress you anticipate. You will receive your first in vivo assignment, usually from the lower part of the hierarchy.

The First Imaginal Exposure

Session three is typically the first imaginal exposure. The therapist will explain the procedure carefully and answer questions. You will then close your eyes and recount the trauma in present tense, in as much detail as you can manage, with periodic distress ratings. The recounting is recorded. After exposure ends, you and the therapist will process — discussing what arose, what you noticed, and what surfaced. Many clients find this session more bearable than they expected; some find it intensely difficult. Both reactions are normal.

The First Week of Listening

Between sessions, you will be asked to listen to the imaginal exposure recording daily and complete your assigned in vivo exposures. Listening can be hard — many clients procrastinate the first time. Once started, distress typically subsides faster than expected with repetition.

Common Early Experiences

• Dread of session three the way one might dread a difficult procedure
• Surprise at being able to talk through the memory — and surprise at how exhausting it is
• Intensified intrusions and sleep disturbance in the first week or two
• Strong urges to drop out of treatment, particularly between sessions three and five
• Noticeable progress on in vivo items that had seemed impossible

The Middle Phase

Most clients begin to see meaningful change between sessions 4 and 8. Distress ratings during imaginal exposure decline. In vivo items higher on the hierarchy become tolerable. Sleep often improves. Intrusions become less frequent or less intense. The middle phase is also when hot-spot work typically intensifies.

The Closing Phase

Later sessions focus on consolidating gains, completing higher in vivo items, addressing any remaining hot spots, and preparing for termination. A final review compares baseline and current symptom measures, identifies any remaining issues, and develops a plan for maintenance.

Self-Care During Treatment

PE is demanding. Adequate sleep, moderate physical activity, social support, and limited alcohol use substantially affect what you can do in session. Many clients find it useful to schedule treatment during a period of relatively manageable life stress rather than during high-intensity times.

If You Struggle

If between-session work becomes impossible, if symptoms intensify and do not begin to settle, or if you find yourself unable to engage with imaginal exposure, raise these concerns directly with your therapist. Skilled therapists can adjust pacing, work on motivation, increase support, or — if indicated — modify the approach. Persistent inability to engage is a clinical signal, not a personal failure.