Tagcannabis use disorder

Reading of the Week: Cannabis, Cannabis, Cannabis – With Papers from Psychological Medicine, Psychiatric Services, and Annals of Internal Medicine

From the Editor

“It’s the only thing that works.”

So many of our patients swear by cannabis. It has become a popular choice for everything from anxiety to chronic pain. And though the literature is relatively young, now we know more about cannabis than before. This week, we focus on three new papers.

The first selection is a paper by Dr. Emmet Power (of the Royal College of Surgeons in Ireland) and his co-authors from Psychological Medicine. Does frequent and dependent cannabis use in youth affect IQ? Doing a systematic review and meta-analysis, they find seven papers. They conclude: “We found that young people who use cannabis frequently or dependently by age 18 have declined in IQ at follow up and this may be due to a decline in verbal IQ.”


In the second selection, we consider a new paper from Psychiatric Services. Dr. Corneliu N. Stanciu (of Dartmouth College) and his co-authors did a systematic review of cannabis for several disorders. “With only eight very small studies, insufficient evidence was found for efficacy of CBD and THC to manage affective disorders, anxiety disorders, or PTSD.”

Finally, in the third selection, we look at a paper from Annals of Internal Medicine. Drs. Arthur Robin Williams (of Columbia University) and Kevin P. Hill (of Harvard University) pose 15 questions about cannabis and answer them. The authors are practical and thoughtful. The clinical bottom line: “Millions more adults now meet criteria for cannabis use disorder in a given year, and all clinicians, not just mental health professionals, have vital roles in improving clinical management, from screening and diagnosis to overseeing treatment plans.”


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Reading of the Week: Cannabis for Mental Illness (CJP)? Also, Cannabidiol for the Cannabis Use Disorder (Lancet Psych) & Love on the Police (Globe)

From the Editor

“Should I take cannabis for my mental illness?”

Our patients ask this question – in our EDs, inpatient wards, and outpatient clinics. We shouldn’t be surprised. Cannabis is now legal, and private industry pushes the medicinal benefits of cannabis. But what does the literature say?

This week, we have three selections.

The first is a new Canadian Psychiatric Association position statement that considers cannabis and mental illness. Dr. Philip G. Tibbo (of Dalhousie University) and his co-authors systematically reviewed the literature. They found 29 RCTs, including for anxiety and psychotic disorders. “Use of cannabis or a cannabinoid product should never delay (or replace) more evidence-based forms of treatment.”

marijuana-candy-sizedMany products, little evidence?

But is there emerging evidence for cannabis? Tom P. Freeman (of the University College London) and his co-authors did a phase 2a trial using CBD to address cannabis use disorder, which is written up in The Lancet Psychiatry. “In the first randomised clinical trial of cannabidiol for cannabis use disorder, cannabidiol 400 mg and 800 mg were safe and more efficacious than placebo at reducing cannabis use.”

Finally, on a pivot, in the third selection, we consider an essay from The Globe and Mail. Rebeccah Love writes about her own experiences with psychosis and her recovery. She also considers whether police should be involved in mental health crises. “The image of a police officer – often a big white man with a gun – is interpreted as a threat, an agent of death, an oppressor.”


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