Systematic review finds cannabinoids may help PTSD symptoms, especially sleep and nightmares, but evidence is low quality
A systematic review of 10 studies found cannabinoids may reduce PTSD symptoms, particularly sleep disturbances and nightmares, but all studies had medium to high risk of bias and only one was a controlled trial.
Quick Facts
What This Study Found
Every study had medium to high risk of bias and was of low quality. Within these limitations, cannabinoids appeared to decrease global PTSD symptoms, with the most consistent benefits for sleep disturbances and nightmares.
Key Numbers
10 studies included. Only 1 was a randomized controlled trial. All had medium to high risk of bias. Sleep and nightmare improvements were the most consistent findings.
How They Did This
Systematic review including all studies through December 2018 where patients had diagnosed PTSD and used cannabinoids to reduce symptoms. Only one study was an RCT; the rest were observational, retrospective, or case reports.
Why This Research Matters
PTSD is a debilitating condition with limited treatment options, and many patients are already self-medicating with cannabis. This review quantifies how little rigorous evidence exists to guide this practice.
The Bigger Picture
The gap between patient interest in cannabis for PTSD and the quality of available evidence highlights an urgent need for well-designed clinical trials, especially given the large veteran population using cannabis for PTSD.
What This Study Doesn't Tell Us
Nearly all evidence is observational or case-based. The single RCT was a small pilot study. Heterogeneous cannabinoid products and dosing across studies prevent meaningful comparison.
Questions This Raises
- ?Would large-scale RCTs confirm the sleep and nightmare benefits?
- ?Which cannabinoid (THC, CBD, or combination) is most appropriate for PTSD?
- ?Are there PTSD subtypes that respond better to cannabinoids?
Trust & Context
- Key Stat:
- 10 studies, all low quality; sleep/nightmares most consistently improved
- Evidence Grade:
- Preliminary: systematic review finding only low-quality evidence across 10 studies.
- Study Age:
- Published in 2020 in Journal of Dual Diagnosis.
- Original Title:
- The Effectiveness of Cannabinoids in the Treatment of Posttraumatic Stress Disorder (PTSD): A Systematic Review.
- Published In:
- Journal of dual diagnosis, 16(1), 120-139 (2020)
- Authors:
- Hindocha, C, Cousijn, J(5), Rall, M, Bloomfield, M A P
- Database ID:
- RTHC-02611
Evidence Hierarchy
Analyzes all available research on a topic using a structured method.
What do these levels mean? →Frequently Asked Questions
Can cannabis treat PTSD?
The evidence suggests it may help, particularly with sleep problems and nightmares, but the quality of research is too low to make clinical recommendations. All 10 studies had significant limitations.
Why is the evidence so weak?
Cannabis remains federally restricted in many countries, making clinical trials difficult. Most evidence comes from observational studies or case reports rather than the gold-standard randomized controlled trials needed for strong conclusions.
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Cite This Study
https://rethinkthc.com/research/RTHC-02611APA
Hindocha, C; Cousijn, J; Rall, M; Bloomfield, M A P. (2020). The Effectiveness of Cannabinoids in the Treatment of Posttraumatic Stress Disorder (PTSD): A Systematic Review.. Journal of dual diagnosis, 16(1), 120-139. https://doi.org/10.1080/15504263.2019.1652380
MLA
Hindocha, C, et al. "The Effectiveness of Cannabinoids in the Treatment of Posttraumatic Stress Disorder (PTSD): A Systematic Review.." Journal of dual diagnosis, 2020. https://doi.org/10.1080/15504263.2019.1652380
RethinkTHC
RethinkTHC Research Database. "The Effectiveness of Cannabinoids in the Treatment of Posttr..." RTHC-02611. Retrieved from https://rethinkthc.com/research/hindocha-2020-the-effectiveness-of-cannabinoids
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.