Study Questions Efficacy of Medicinal Cannabis for Mental Health Conditions

A recent comprehensive review suggests that medicinal cannabis may not effectively treat mental health disorders and could potentially worsen outcomes. The study, published in The Lancet Psychiatry, evaluated 54 trials conducted between 1980 and 2005, focusing on conditions such as anxiety, depression, and post-traumatic stress disorder (PTSD). The researchers found no substantial evidence supporting the efficacy of medicinal cannabis for these conditions.

Dr. Jack Wilson, lead author from the Matilda Centre at the University of Sydney, stated that the routine use of medicinal cannabis could be doing more harm than good by worsening mental health outcomes, such as a greater risk of psychotic symptoms and developing cannabis use disorder, and delaying the use of more effective treatments.

The study also noted that while medicinal cannabis might offer some benefits for conditions like cannabis addiction, autism, insomnia, or Tourette’s syndrome, the quality of evidence was low, and more large-scale trials are needed. The researchers emphasized the need for greater regulation in prescribing medicinal cannabis to ensure patients receive effective treatments while minimizing harm from ineffective or unsafe cannabis products.

In the UK, approximately 50,000 to 60,000 patients use medicinal cannabis, and in the US and Canada, nearly a third of individuals aged 16 to 65 have used cannabis for medicinal purposes, with about half using it to manage their mental health. Major medical bodies, including the American Medical Association, have raised concerns about the largely unregulated growth in prescribing medicinal cannabis and the uncertainty surrounding the efficacy and safety of these products.