Cannabis Appears Safe for Treatment of Chronic Pain

HealthDay News — Cannabis appears to be reasonably safe for chronic pain treatment, according to research published in The Journal of Pain that monitored patients who used the drug for one year. 

Mark Ware, MBBS, director of clinical research for the Alan Edwards Pain Management Unit at McGill University Health Center in Montreal, and colleagues followed 215 adult patients with chronic pain who used medical cannabis for one year. The researchers compared the cannabis users to a control group of 216 chronic pain patients who didn’t use cannabis. The study involved seven pain treatment centers across Canada. The participants using cannabis were given leaf marijuana containing 12.5% tetrahydrocannabinol from hospital pharmacies, Ware said, and it could be smoked, eaten, or inhaled.

There was no difference in serious side effects between the two groups, the researchers found. Cannabis users did have a 73% increased risk of minor side effects.

“Quality-controlled herbal cannabis, when used by cannabis-experienced patients as part of a monitored treatment program over one year, appears to have a reasonable safety profile,” the authors conclude. “Longer term monitoring for functional outcomes is needed.”


Ware MA et al.The Journal of Pain. 2015; doi:10.1016/j.jpain.2015.07.014.