News Release 

Cannabis found not to be a substitute for opioids

No evidence to suggest cannabis helps patients stop using opioids

McMaster University

IMAGE

IMAGE: Dr. Zainab Samaan, associate professor of psychiatry and behavioural neurosciences at McMaster University and a Hamilton staff psychiatrist view more 

Credit: McMaster University (2018)

HAMILTON, ON (Nov. 19, 2019) - There has been interest in cannabis being used as a replacement drug for people with opioid use disorder, but research at McMaster University has found it doesn't work.

The research team looked at all research on the effects of cannabis use on illicit opioid use during methadone maintenance therapy, which is a common treatment for opioid use disorder, and found six studies involving more than 3,600 participants.

However, a meta-analysis of the studies found cannabis use didn't reduce illicit opioid use during treatment nor did it retain people in treatment.

The study was published today in the Canadian Medical Association Journal.

"There is limited evidence that cannabis use may reduce opioid use in pain management, and some high-profile organizations have suggested cannabis is an 'exit drug' for illicit opioid use, but we found no evidence to suggest cannabis helps patients with opioid use disorder stop using opioids," said senior author Dr. Zainab Samaan, associate professor of psychiatry and behavioural neurosciences at McMaster and a Hamilton staff psychiatrist.

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The study was funded by the Canadian Institutes of Health Research.

Editors: A picture of Zainab Samaan is attached.

Post embargo link to the paper: https://bit.ly/2Qjs7fn

For more information or to arrange an interview, please contact:

Veronica McGuire
Media Relations
Faculty of Health Sciences

location: HSC-2E47
phone: (905) 525-9140 x 22169
email: vmcguir@mcmaster.ca

McMaster University | Brighter World

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