Co-Occurring Disorders Editor · Last reviewed January 2025
The co-occurrence of PTSD and substance use disorders is one of the most clinically significant presentations in behavioral health treatment. Understanding how these two conditions interact, which came first, and how integrated treatment addresses both simultaneously is essential for effective care.
Prevalence and the Bidirectional Relationship
PTSD and substance use disorders co-occur at high rates — 30–60% across studies of each condition's treatment-seeking populations. Many individuals with PTSD use substances specifically to manage hyperarousal, intrusive symptoms, emotional numbing, and sleep disruption. Alcohol, opioids, cannabis, and benzodiazepines are most commonly used. Substance use maintains PTSD by preventing the natural fear extinction that would otherwise occur, making integrated treatment particularly important for this pairing. The relationship is bidirectional and mutually reinforcing: mental health symptoms drive substance use as self-medication, and substance use worsens, triggers, or maintains mental health symptoms through direct neurobiological effects and disruption of sleep, social functioning, and daily routines.
Diagnostic Complexity
Accurately diagnosing both conditions in the context of active substance use is challenging. Many substances produce psychiatric symptoms during intoxication or withdrawal that mimic primary mental health conditions. Comprehensive dual diagnosis assessment by a clinician trained in both areas — ideally after a period of sobriety or stable use — is essential. That said, severe psychiatric symptoms may require immediate treatment regardless of substance use status.
Why Sequential Treatment Often Fails
When mental health symptoms are driving substance use as self-medication, leaving those symptoms untreated undermines sobriety. When substance use is maintaining psychiatric symptoms through neurobiological dysregulation or psychological avoidance, leaving addiction untreated undermines psychiatric treatment. Integrated simultaneous treatment consistently outperforms sequential approaches in the research literature.
Integrated Treatment
Seeking Safety — a present-focused coping skills approach developed by Lisa Najavits — has the largest evidence base of any dual diagnosis treatment, with positive results across 25+ randomized controlled trials in diverse PTSD-SUD populations. COPE (Concurrent Treatment of PTSD and SUD Using Prolonged Exposure) directly integrates PE for PTSD with CBT for SUD with positive trial results. Substance use treatment should be provided concurrently with trauma treatment — PTSD symptoms driving substance use do not improve with abstinence alone. Pharmacotherapy includes SSRIs for PTSD symptoms (sertraline and paroxetine are FDA-approved) and MAT where indicated for opioid or alcohol use disorder. Prazosin has evidence for PTSD-related nightmares and sleep disruption.
Finding Integrated Treatment
SAMHSA's National Helpline (1-800-662-4357) and treatment locator at findtreatment.gov identify programs with dual diagnosis specialty. When evaluating programs, ask specifically whether both conditions are treated simultaneously, whether a psychiatric prescriber is on staff, and what evidence-based co-occurring disorders treatments are used.
Related: Trauma-Informed Care · CBT for Dual Diagnosis · PTSD Overview