Across 14 studies of cannabis and PTSD, evidence was mixed for overall symptom improvement but suggested possible benefits for re-experiencing and arousal symptoms, while patients with comorbid cannabis use disorder showed consistently worse outcomes.
PTSD clinicians, military/veteran healthcare providers, cannabis prescribers, addiction specialists
CUD patients: worsened outcomes in all 3 studies
What the researchers found
Of 10 studies in non-CUD samples, 5 suggested benefits and 5 showed no effect or worsening. Four studies found benefits for cluster B (re-experiencing) and cluster E (arousal/reactivity) symptoms. All 3 CUD studies reported worsening.
Why it matters
Many PTSD patients use cannabis. The finding that comorbid CUD consistently worsened outcomes while targeted symptom relief appeared in non-CUD users suggests the relationship depends on use patterns.
The numbers in context
14 studies; 5/10 showed benefits for overall symptoms in non-CUD; 4 showed benefits for clusters B and E; 3/3 CUD studies showed worsening.
How the study worked
Systematic review of PubMed, PsycINFO, and EMBASE for studies of cannabis in patients with PTSD using validated measures, January 1990-February 2023. 14 studies met criteria.
What this study cannot tell us
Mixed study designs. Few studies overall (14). Cannot standardize across different cannabis products.
How to read the evidence
Systematic review with appropriate methodology, limited by small number of studies and mixed designs.
When this study was published
2024 publication reviewing studies through February 2023
The bigger picture
The divergence between controlled cannabis use (mixed but some benefits) and cannabis use disorder (consistently harmful) may reflect the dose-response curve seen across cannabis research.
Questions still open
- Which cannabinoid formulations and doses are most effective for PTSD clusters B and E?
- Does CUD worsen PTSD through cannabis-specific mechanisms or general addiction burden?
Common questions
Does cannabis help with PTSD?
Can cannabis make PTSD worse?
Read the original research
A Systematic Review of the Clinical Effects of Cannabis and Cannabinoids in Posttraumatic Stress Disorder Symptoms and Symptom Clusters.
The Journal of clinical psychiatry, 85(1)
Citation
Rodas, Justyne D; George, Tony P; Hassan, Ahmed N. (2024). A Systematic Review of the Clinical Effects of Cannabis and Cannabinoids in Posttraumatic Stress Disorder Symptoms and Symptom Clusters.. The Journal of clinical psychiatry, 85(1). https://doi.org/10.4088/JCP.23r14862
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