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Can CBD Make You Forget Your Trauma?

Dragana Komnenov PhD
PTSD spelled in distressed wood boxes

Cannabis could be the breakthrough treatment for trauma and PTSD

Post-traumatic stress disorder (PTSD) is a psychiatric illness affecting millions of people. It takes hold after a person has experienced a trauma or a life-threatening event. The symptoms of PTSD negatively impact cognition, mood, emotion, and social ability.  Pharmaceuticals and psychiatric therapy have mixed success, with many patients unable to find escape from their condition. We need new therapies that will treat the multi-faceted nature of PTSD symptomology.

Trauma Affected Soldier Collapsed on his knees

Could Cannabis be the Answer? 

Cannabinoid medicine is being investigated as a treatment for PTSD  because it has both anxiolytic (anti-anxiety) and memory-modifying effects. The most pressing question for researchers to answer now, is when to administer cannabis medicine following a traumatic event. There appears to be an important window of opportunity during which, the administration of cannabis could prevent the development of PTSD.

This mental health condition is complicated by the fact that not all individuals experiencing a traumatic event will go on to develop PTSD. So, what is it that protects these individuals from developing this debilitating mental health condition?

Could the answer lie in “endocannabinoid tone?”  A study (2013) found that there were reduced levels of endocannabinoids in workers and victims who developed PTSD following the 9/11 terrorist attacks on America.  Those who did not develop PTSD had normal levels of endocannabinoids. Since this study, additional research has been done to relate the decrease of the endocannabinoid tone to the development of PTSD.

Buds in a glass container

 

Cannabinoids may exert beneficial effects for PTSD via various mechanisms. These could interfere with memory retrieval process and thus help in preventing the recall of the traumatic memory that led to PTSD. Alternatively, cannabinoids could enhance extinction learning, which is a form of learning that allows the previously anxiety (fear) forming memory to become non-threatening again.

Cannabinoids and PTSD Treatment

This is likely the most promising aspect of using cannabinoids for PTSD treatment. This is because the psychotherapies used employ these same excitation mechanisms. In fact, in several studies using pre-clinical models of PTSD, administration of cannabidiol (CBD) found in the cannabis plant enhanced extinction learning. Furthermore, accumulating clinical evidence in recent years suggests that medical cannabis and cannabinoids are effective in relieving PTSD symptomatology.

The first case report on this topic came out in 2012. It involves a 19-year-old patient with severe abuse-related PTSD triggered by flashbacks. He reported to his doctor that consuming cannabis allows him to maintain cognitive control when he remembers traumatic episodes. What stunned his physicians even more was that the therapist he was seeing also reported improvement in self-control and stability, even though the therapist was not aware of the patients ‘self-medicating’ with cannabis.

Another study, involving 80 PTSD patients in New Mexico, found that patients using medical cannabis experienced significant symptom severity reduction, including the loss of: re-experiencing symptoms, numbing, avoidance and hyperarousal.

Nurse taking patient history

 

Two other studies explored the synthetic cannabinoid, Nabilone, in PTSD patients. In both studies, more than three quarters of the patients reported a complete cessation of nightmares. They also report and a significant reduction in daytime flashbacks. Yet another study, using Nabilone in 58 PTSD patients, reported a significant reduction of PTSD symptoms severity as assessed by the common PTSD questionnaire.

A Promising Avenue

The studies conducted with PTSD patients all highlight cannabinoid receptor signaling as a promising avenue of therapeutics for PTSD. The likely reason for this lies in the effect of cannabinoid signaling on the activity of other neurons. When cannabinoid receptors become occupied by cannabinoids,  activity of the surrounding target neuronal circuits downregulates.

In PTSD, neuronal activity heightens in the centers responsible for fear, anxiety and memory. This means we can  expect activation of cannabinoid receptors to prevent the hyperactivation of these neurons. This results in improved PTSD symptomatology.

The likely reason some individuals develop PTSD after traumatic events is because their endocannabinoid tone reduces. Thus, they lack the inhibitory signals for the neuronal centers responsible for fear, anxiety and memory. Therefore, we can think of cannabinoid signaling in PTSD as a “breaking mechanism” preventing the acceleration of fear. This provides PTSD patients with much needed relief from anxiety associated emotions.

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Dragana Komnenov
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