Results of a new yearlong study of prescribed medical marijuana for patients with chronic pain and mental health issues observed an association between cannabis use and symptom improvement, with most side effects limited to dry mouth and sleepiness. At least some of the benefits appeared to fade as the 12-month study period went on, however.

The report, published in the Journal of Pain and Palliative Care Pharmacotherapy, evaluated the effects of medical marijuana on 96 patients over the course of the yearlong observational study, with measurements of pain, depression, anxiety and sleep problems taken at three, six and 12 months.

“We found that the use of medical cannabis was associated with reduced pain during the first 6 months and improved mental well-being over 12 months,” wrote authors, from the University of Melbourne in Australia. “Patients reported not only less pain but also experienced reduced interference from pain in their daily functions. Furthermore, they reported decreased use of pain medications and a large proportion felt that their pain symptoms had significantly improved, as reflected in their reported changes in the severity of pain.”

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