Co-Occurring Disorders Editor · Last reviewed January 2025
The co-occurrence of anxiety disorders 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
Anxiety disorders are among the most common mental health conditions co-occurring with SUDs. Individuals with any anxiety disorder have approximately twice the odds of having a SUD compared to the general population. Alcohol use disorder, benzodiazepine dependence, and cannabis use disorder are particularly commonly co-occurring with anxiety. Anxiety drives substance use as self-medication; chronic alcohol and stimulant use causes or worsens anxiety through neurobiological mechanisms including GABA dysregulation and HPA axis sensitization. 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
SSRIs and SNRIs are the preferred pharmacotherapy for anxiety disorders in this population — no abuse potential, no problematic interactions with MAT medications. Buspirone is a useful non-habit-forming option for GAD. Benzodiazepines, while effective for acute anxiety, carry significant dependence and misuse risk in individuals with SUD histories — most guidelines recommend against long-term benzodiazepine use in this population. CBT with exposure components is the primary psychotherapy, modified to account for substance use. Seeking Safety addresses anxiety/PTSD and SUD without requiring trauma processing — a valuable first-phase intervention for individuals in early recovery who are not yet ready for trauma-focused work.
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: Depression & Addiction · PTSD & Addiction · Benzo & Mental Health