Pass on the joint, new study shows

DAGGA: ALL RESEARCH INCONCLUSIVE ON BENEFITS

No reviews have considered the effects or safety of various cannabinoids.

People with psychiatric disorders may want to pass on the joint – at least until further research is done, a new Australian study suggests. The paper, published in The Lancet Psychiatry, looked at 83 previous studies conducted over almost four decades on medical cannabinoids, including products from the cannabis plant, such as leaves, buds and oils, as well as pharmaceutical-grade cannabinoids.

The authors found insufficient evidence that the products were safe and effective in treating six common disorders: depression, anxiety, attention-deficit hyperactivity disorder, Tourette syndrome, post-traumatic stress disorder and psychosis.

Cannabis and cannabinoids are increasingly being made available for medicinal use in North America, Britain and Australia without being subjected to the standard process that includes testing and scrutinising by government regulatory bodies, lead author Louisa Degenhardt said.

“One of the most striking things about the spread of legislation in multiple countries permitting cannabis/cannabinoids for medicinal purposes is that this is in many instances happening outside of the regulatory frameworks that medicine development typically occurs within,” said Degenhardt, from the National Drug and Alcohol Research Centre at the University of New South Wales in Sydney.

The study found that after chronic non-cancer pain, mental health is one of the most common reasons for using medicinal cannabinoids.

But no reviews have considered the varying effects of the different types of cannabinoids or their safety, and the only studies into long-term effects were conducted on individuals using cannabis for recreational use.

In most randomised-controlled trials of the effects of cannabinoids on depression and anxiety, the use was related to another condition, like chronic pain or multiple sclerosis.

Some studies showed improvement in anxiety symptoms, but it was unclear if that effect was due to improvements in the primary condition.

In one small study of patients with psychosis, pharmaceutical THC – the active substance in cannabis – actually worsened symptoms.

“There are risks of developing dependence,” said Degenhardt. “There is evidence that people who use cannabis regularly may be at increased risk of developing depression and psychotic symptoms.” – AFP