Clinical Takeaway
People with PTSD and co-occurring substance use disorders who also use cannabis can still benefit meaningfully from trauma-focused treatments. Clinicians should not withhold or delay evidence-based PTSD care based on a patient’s cannabis use status.
#5 Cannabis use and trauma-focused treatment for co-occurring posttraumatic stress disorder and substance use disorders: A meta-analysis of individual patient data.
Citation: Hill Melanie L et al.. Cannabis use and trauma-focused treatment for co-occurring posttraumatic stress disorder and substance use disorders: A meta-analysis of individual patient data.. Journal of anxiety disorders. 2024. PMID: 38266511.
Design: 6 Journal: 0 N: 4 Recency: 1 Pop: 2 Human: 1 Risk: -2
This meta-analysis directly addresses a critical clinical gap by quantifying whether trauma-focused PTSD treatments remain efficacious in patients with cannabis use comorbidity, a population traditionally excluded from efficacy trials despite high prevalence. The findings clarify treatment planning for the substantial proportion of PTSD+SUD patients who use cannabis, potentially validating or refining current evidence-based protocols rather than requiring alternative approaches. Given the high rates of cannabis use in PTSD populations, these results have immediate implications for real-world treatment selection and patient outcomes in dual-diagnosis settings.
Quality Gate Alerts:
- Preclinical only
Abstract: High rates of cannabis use among people with posttraumatic stress disorder (PTSD) have raised questions about the efficacy of evidence-based PTSD treatments for individuals reporting cannabis use, particularly those with co-occurring alcohol or other substance use disorders (SUDs). Using a subset of four randomized clinical trials (RCTs) included in Project Harmony, an individual patient meta-analysis of 36 RCTs (total N = 4046) of treatments for co-occurring PTSD+SUD, we examined differences in trauma-focused (TF) and non-trauma-focused (non-TF) treatment outcomes for individuals who did and did not endorse baseline cannabis use (N = 410; 70% male; 33.2% endorsed cannabis use). Propensity score-weighted mixed effects modeling evaluated main and interactive effects of treatment assignment (TF versus non-TF) and baseline cannabis use (yes/no) on attendance rates and within-treatment changes in PTSD, alcohol, and non-cannabis drug use severity. Results revealed significant improvements across outcomes among participants in all conditions, with larger PTSD symptom reductions but lower attendance among individuals receiving TF versus non-TF treatment in both cannabis groups. Participants achieved similar reductions in alcohol and drug use across all conditions. TF outperformed non-TF treatments regardless of recent cannabis use, underscoring the importance of reducing barriers to accessing TF treatments for individuals reporting cannabis use.
🧠 This meta-analysis addresses an important clinical gap by examining whether trauma-focused treatments maintain efficacy in patients with co-occurring PTSD and substance use who are actively using cannabis, a question that has significant real-world relevance given the prevalence of this presentation. While the use of individual patient data from rigorous RCTs strengthens the analysis compared to aggregate-level meta-analyses, the relatively small subset of four trials examining cannabis specifically may limit generalizability, and the inability to account for cannabis dose, potency, frequency of use, or the timing of use relative to treatment may obscure important dose-response relationships. Additionally, the heterogeneity inherent in trauma-focused interventions and the potential for unmeasured confounders related to why patients continue cannabis use during treatment deserves consideration when interpreting findings. From a clinical standpoint, these results should guide a more nuanced discussion with patients about their cannabis use during PTSD treatment, moving beyond categorical exclusion criteria while remaining attentive to the possibility that continued