Activating CB1 receptors, either directly or by boosting endocannabinoids, facilitates the extinction of aversive memories with large effect sizes, offering therapeutic potential for PTSD.
PTSD researchers, trauma therapists, psychiatrists, and veterans or trauma survivors exploring cannabinoid options.
Cohen's d >= 1.0 effect sizes
What the researchers found
Direct or indirect CB1 receptor activation consistently facilitated extinction of aversive/traumatic memories across animal and human studies. Effect sizes were large (Cohen's d >= 1.0) in most cases. Key brain areas involved include the medial prefrontal cortex, amygdala, and hippocampus. Timing of administration (around memory formation or reminders) influenced outcomes.
Why it matters
PTSD is fundamentally a disorder of aversive memory that resists extinction. If cannabinoids reliably facilitate this extinction process, they could enhance exposure-based therapies that are the current gold standard for PTSD treatment.
The numbers in context
Effect sizes were large (Cohen's d >= 1.0) in most studies. Effects observed in medial prefrontal cortex, amygdala, and hippocampus. Both CB1 activation and endocannabinoid augmentation were effective.
How the study worked
Comprehensive review of animal and human studies on cannabinoid interventions for aversive memory extinction, with effect size calculations for each intervention.
What this study cannot tell us
Most data comes from animal studies with relatively simple fear conditioning paradigms. Human PTSD involves more complex memory processing. Few clinical trials have tested cannabinoid augmentation of PTSD therapy.
How to read the evidence
Strong: consistent findings across multiple animal and human studies with quantified large effect sizes.
When this study was published
Published in 2019.
The bigger picture
The endocannabinoid system appears to be a natural mechanism for updating threat memories. Enhancing this system pharmacologically could make existing trauma therapies more effective rather than requiring entirely new treatment approaches.
Questions still open
- Could cannabinoids be used as adjuncts to exposure therapy for PTSD? What is the optimal timing of cannabinoid administration relative to trauma memory reactivation?
Common questions
How might cannabinoids help with PTSD?
Is there human evidence for this?
Read the original research
Tempering aversive/traumatic memories with cannabinoids: a review of evidence from animal and human studies.
Psychopharmacology, 236(1), 201-226
Citation
Lisboa, Sabrina F; Vila-Verde, C; Rosa, J; Uliana, D L; Stern, C A J; Bertoglio, L J; Resstel, L B; Guimaraes, F S. (2019). Tempering aversive/traumatic memories with cannabinoids: a review of evidence from animal and human studies.. Psychopharmacology, 236(1), 201-226. https://doi.org/10.1007/s00213-018-5127-x
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