Benzodiazepines Worsen PTSD Outcomes and Should Be Avoided
Benzodiazepines are contraindicated in PTSD and should not be used, as they significantly increase the risk of developing PTSD after trauma, worsen overall symptom severity, interfere with effective psychotherapy, and are associated with aggression, depression, and substance use in this population. 1, 2
The Evidence Against Benzodiazepines in PTSD
Increased Risk of PTSD Development
The most concerning finding is that benzodiazepines administered shortly after trauma actually increase the likelihood of developing PTSD. In one study, 63% of participants receiving benzodiazepines (clonazepam or alprazolam) within one week of trauma met criteria for PTSD at 6 months, compared to only 23% receiving placebo 3. A 2022 meta-analysis of cohort studies confirmed this pattern, showing a 53% increased risk of PTSD in patients who received benzodiazepines compared to those who did not (RR = 1.53) 4.
Worsening of Existing PTSD
For those already diagnosed with PTSD, benzodiazepines are ineffective and potentially harmful. A comprehensive 2015 systematic review analyzing 5,236 participants concluded that benzodiazepines are ineffective for PTSD treatment and prevention, with risks outweighing any potential short-term benefits 2. Specific problems include:
- Worse overall PTSD severity
- Worse psychotherapy outcomes (interfering with evidence-based treatments like prolonged exposure and cognitive processing therapy)
- Increased aggression
- Worsening depression
- Increased substance use 2
Official Guideline Recommendations
The 2023 VA/DoD Clinical Practice Guideline for PTSD explicitly recommends against the use of benzodiazepines for PTSD treatment 1. This represents the strongest level of recommendation against their use, based on the accumulated evidence of harm.
Why Benzodiazepines May Worsen Depression and PTSD
Neurobiological Mechanisms
Benzodiazepines interfere with the natural fear extinction and memory consolidation processes that are essential for recovery from trauma. Research shows altered benzodiazepine receptor binding in PTSD patients, particularly in the prefrontal cortex 5, 6. By artificially enhancing GABAergic inhibition during the critical period after trauma, benzodiazepines may:
- Block the emotional processing necessary for natural recovery
- Interfere with fear extinction learning (the neurobiological basis of exposure therapy)
- Prevent adaptive stress responses that facilitate resilience
- Impair memory consolidation in ways that maintain traumatic memories
Depression Connection
For depression specifically, benzodiazepines create several problems:
- Rebound anxiety and depression upon withdrawal - even gradual tapering can be associated with rebound anxiety, hallucinations, and worsening mood 7
- Interference with antidepressant efficacy - benzodiazepines may blunt the therapeutic effects of evidence-based treatments
- Dependence and withdrawal - long-term use (which occurs in approximately 50% of patients prescribed these medications) leads to physical dependence, and withdrawal itself causes depressive symptoms 8
- Cognitive impairment - the sedative effects impair the cognitive engagement necessary for psychotherapy
Clinical Implications
What to Use Instead
For PTSD: The guideline strongly recommends manualized psychotherapies (prolonged exposure, cognitive processing therapy, or EMDR) as first-line treatment. If medication is needed, SSRIs (paroxetine, sertraline) or venlafaxine are recommended 1.
For anxiety in PTSD patients: Evidence-based psychotherapies (particularly CBT) and/or antidepressants approved for anxiety should be offered instead of benzodiazepines 7.
For depression: Antidepressants (SSRIs/SNRIs) are appropriate and do not carry the same risks as benzodiazepines 8.
Common Pitfalls to Avoid
Don't prescribe benzodiazepines "just for a few weeks" - even short-term use after trauma increases PTSD risk 3, 4
Don't use benzodiazepines to help patients "tolerate" trauma-focused therapy - they actually worsen psychotherapy outcomes 2
Recognize existing benzodiazepine use as a treatment barrier - if patients are already on benzodiazepines, prioritize careful tapering (25% dose reduction every 1-2 weeks) with CBT support before or alongside trauma-focused treatment 7
Don't confuse short-term symptom relief with treatment efficacy - while benzodiazepines may provide immediate anxiety reduction, they prevent the long-term recovery mechanisms necessary for PTSD resolution
Special Consideration: Comorbid Conditions
In patients with comorbid bipolar disorder and PTSD, benzodiazepine use was associated with only small improvements in depression but poorer quality of life overall 9. This reinforces that even when benzodiazepines appear to help one symptom, the overall impact on functioning and recovery is negative.
The evidence is clear and consistent: benzodiazepines should be considered relatively contraindicated for patients with PTSD or recent trauma 2. Evidence-based psychotherapies and appropriate antidepressants should be favored instead.