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Canada’s National Guideline for the Clinical Management of Opioid Use Disorder (OUD) has been updated to reflect the latest literature. The new document recommends buprenorphine and methadone as first-line treatments for OUD.
Opioid use and OUD remain the leading causes of drug-related death worldwide. In Canada, the number of apparent opioid-related deaths increased from 2831 in 2016 to 8049 in 2023. Despite the expansion of treatment options, including the lifting of restrictions on methadone prescribing in 2018, there has been a substantial surge in opioid-related harms, the authors wrote.
“OUD and opioid-related harms have devastating outcomes for our communities across Canada,” author Ginette Poulin, MD, a family physician at the University of Manitoba in Winnipeg, Manitoba, Canada, said in a statement. “With the growing dangers associated with the illicit market, we need to ensure we are sharing the most relevant therapeutic tools and up-to-date knowledge to help providers and communities address this complex issue.”
The 2024 update, which was drafted by the Canadian Research Initiative in Substance Matters (CRISM), was published on November 12 in CMAJ.
Expanding Access
The COVID-19 pandemic marked an increase in opioid-related harms, senior author Julie Bruneau, MD, Canada research chair in addiction medicine and professor of family and emergency medicine at the Université de Montréal, Montréal, Quebec, Canada, told Medscape Medical News. Access to essential services and support for people with OUD became restricted, and the drug supply became toxic and volatile.
“In March 2018, CRISM published the first Canadian national clinical practice guideline to assist clinicians in making informed decisions regarding the clinical management of OUD, and recommendations were made in light of existing evidence on prioritizing available treatments,” said Bruneau.
“This guideline is intended for use by healthcare providers, including physicians, nurse practitioners, pharmacists, clinical psychologists, social workers, medical educators, and clinical care case managers with or without specialized experience in addiction treatment. We hope it will help expand access to evidence-based interventions for people with OUD beyond tertiary care,” she said.
Bruneau added that integrating first-line opioid agonist treatment into primary care could reduce stigma, increase early screening and patient retention, and help reduce Canada’s opioid crisis.
The CRISM guideline development team carried out a comprehensive systematic review of the literature published from January 1, 2017, to September 14, 2023. The team, which included patients with OUD, drafted and graded their recommendations using the Grading of Recommendations, Assessment, Development and Evaluation approach.
“First, OUD management should be based on a patient-centered approach, which includes respect for the patient’s rights, preferences, and dignity,” said Bruneau.
Highlights of the guideline include the following recommendations:
Buprenorphine, with or without naloxone, and methadone can be used as standard first-line treatment options.
Opioid agonist treatment with slow-release oral morphine should be made available and offered as a second-line option.
Patients with OUD should not be offered withdrawal management as stand-alone treatment because it is associated with increased rates of relapse, morbidity, and mortality.
Psychosocial treatment, interventions, and supports can be offered as adjunct treatments but should not be a mandatory component of standard treatment for OUD and should not prevent access to opioid agonist therapy.
Harm reduction strategies should be offered as part of the continuum of care for patients with OUD.
Pregnant people can be offered buprenorphine or methadone as treatment options.
Treating More Patients
“Too many people die from untreated opioid addiction in Canada,” Co-author Peter Selby, MD, director of medical education at the Centre for Addiction and Mental Health, said in a statement. “We have medicines that help people stop using, but too few patients are treated due to stigma and lack of prescribers knowing what to do. These national guidelines help them use proven medications to not only prevent death but also help people recover.”
“That both buprenorphine and methadone are now to be considered first-line therapy for the management of OUD is an important change to the guideline,” said Abhimanyu Sud, MD, PhD, research chair in primary care and population health systems at Humber River Health and assistant professor of family and community medicine at the University of Toronto. He did not participate in drafting the guidelines.
“There is a lot of good evidence that these agents are effective for the management of OUD. We had this idea that methadone was harder or somehow more unsafe than buprenorphine, and that buprenorphine was therefore a safer therapy that should be used more widely. Now we have very high-potency opioids that are circulating, and methadone, as a strong opioid agonist, has an important role to play. Clinical experience has borne that out, and this is reflected in the guidelines,” said Sud.
“When we treat patients who are using fentanyl, for example, or fentanyl analogs, or they’re not sure what they are using because the drug supply has been so contaminated, you sometimes need another agent. Also, a lot of patients do not respond very well to buprenorphine, so for many people, a full agonist like methadone is needed,” he added.
Giving higher priority to slow-release morphine is a good move, and the drug’s use is likely to be safe when administered by a skilled clinician, said Akash Goel, MD, staff physician in the Department of Anesthesiology and Pain Medicine at St. Michael’s Hospital and assistant professor of anesthesiology and pain medicine at the University of Toronto. Goel was not involved in drafting the guideline.
The updated document will empower patients to make informed decisions about their care, he said. “Buprenorphine, for example, may not be the right selection for all patients. The updated guideline recognizes this. So, for patients who are at risk of failing OUD therapy and going back to using, buprenorphine may not be the best option. The new guideline gives patients the opportunity to have a conversation with their healthcare providers and then decide what’s the best way forward for them.”
The guideline was supported by Health Canada and the Canadian Institutes of Health Research (CIHR) via CRISM. Poulin reported receiving honoraria for presentations from the Master Clinician Alliance and Indivior outside this work. Bruneau reported receiving a CIHR research grant and a grant from Health Canada’s Substance Use and Addictions Program. Outside this work, Bruneau received a National Institutes of Health research grant and consulting fees for Gilead Sciences and AbbVie.
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