Canada Seeks Feedback on Proposed Opioid and Cannabis Guidelines

By Pat Anson, PNN ditor

Health officials and pain management experts in Canada are seeking public feedback on proposed changes to Canada’s 2017 opioid prescribing guideline. They’re doing it through an online survey, with responses accepted not only from Canadians, but from providers, patients, caregivers and policymakers in the United States and other countries.

“We are very happy to receive feedback from both Canadians and Americans,” says Jason Busse, DC, a clinical epidemiologist and professor of anesthesia at McMaster University. “We are still in the process of drafting the guidelines, as the feedback we receive will affect these documents.”

Busse is leading a panel at McMaster’s Michael G. DeGroote National Pain Centre that has developed 11 draft recommendations for a revised opioid guideline. Survey respondents are being asked whether they agree or disagree with the recommendations, which focus on whether opioids should be a first line treatment for people with chronic non-cancer pain.

Consistent with the current guideline, the panel believes there are several non-opioid treatments that are just as effective as opioids and have less risk of adverse events. It also strongly recommends that opioids not be given to people with a history of opioid overdose, substance abuse, or mental health problems. For pain sufferers without such a history, the panel recommends “discussing a trial” of opioids if nonopioid treatments haven’t lessened their pain.

If opioids are prescribed, the panel suggests avoiding daily doses higher than 80 morphine milligram equivalents (MME), and strongly recommends against doses higher than 150 MME.  The estimated risk of a fatal overdose at 80 MME is relatively low at 0.23% (2.3 overdoses for every 1,000 people) and at 150mg MME is 0.5% (5 in 1,000).

The 80/150 MME recommendations are a substantial change from Canada’s current guideline, which suggest that initial doses of opioids be less than 50 MME and that they not exceed 90 MME.

For people in pain who are stable on long-term opioid therapy, the panel recommends that clinicians “initiate a discussion” of tapering to a lower dose, potentially including discontinuation. If the patient refuses, the panel recommends that another “discussion” be repeated every 6 to 12 months. Forced or involuntary tapering is not recommended.

“The Guideline Panel has formulated their recommendations based on current evidence and the values and preferences of people living with chronic pain. We are seeking public feedback on the current wording of the recommendations and associated remarks. We will review all feedback received in order to further optimize the wording and clarity of the recommendations and remarks,” Busse said in an email to PNN.

To take the opioid survey, click here.

Medical Cannabis Survey

A second survey is also being conducted by the National Pain Centre to help formulate a Canadian guideline for treating chronic pain with medical cannabis. As with the first survey, this one is open to everyone, regardless of where they live.

There are currently four draft recommendations for cannabis. The panel recommends a “trial of cannabis” for chronic pain only if a patient has tried other therapies that haven’t worked. The panel says there is evidence of small improvements in pain, physical function and sleep when cannabis was used.

Smoking cannabis is not recommended. The panel suggests that patients start with low doses of cannabis taken orally in oils and soft gels or inhaled through a vaporizer. Doses can be increased, depending how a patient responds.

Another recommendation is that cannabis be used by patients as a substitute for opioids or to help taper them to lower doses. The panel says “there is little to no difference” in effectiveness between cannabis and opioids, but that cannabis has far less risk of adverse events.

To take the cannabis survey, click here.  

Both surveys will take about 20 minutes to complete and will remain open until 12pm ET, February 29, 2024.

Study Finds Low Risk of Overdose From Prescription Opioids

By Pat Anson, PNN Editor

A large new study that identifies the top risk factors for an overdose involving prescription opioids has inadvertently shown just how low the risk is in the first place.

In a systematic review published in the Canadian Medical Association Journal, researchers at McMaster University looked at 28 studies involving nearly 24 million patients in the United States, Canada and the United Kingdom who were prescribed opioids for chronic pain.

They found 10 “predictors” associated with a higher risk of a fatal or nonfatal overdose, such as a patient taking high doses, having a substance abuse problem, and having multiple prescribers or pharmacies.

Many of these risk predictors are already well-known. What’s different about this study is that the researchers calculated the odds of an overdose happening in different situations and doses. That’s where things get interesting:

“High-certainty evidence from 14 studies involving 1,315,173 patients showed a linear dose–response relationship with opioid overdose. The association was small at a 50-mg morphine equivalent dose/day (OR 1.69, 95% CI 1.50–1.90) and large at 90 mg (OR 2.57, 95% CI 2.08–3.18), with an absolute risk 2.6 per 1000 for fatal overdose and 5.1 per 1000 for nonfatal overdose at a 90-mg morphine equivalent dose/day.”

In plain English, the risk of a fatal overdose at 90 morphine milligram equivalents (MME) is not “large.” It’s only 0.26% at 90 MME, which is considered a fairly high dose. The risk of a fatal overdose is even lower at 50 MME – just 0.16% -- a level that researchers say is “small-to-trivial.”

I’m not a statistician, but 0.26% and 0.16% seem like pretty small odds – similar to the lifetime risk of dying in a car accident, fire or drowning. Unlike opioids, there is no talk of a ban on swimming pools, motor vehicles or matches.

“I think that most people living with chronic pain would agree with your interpretation,” says co-author Jason Busse, DC, a clinical epidemiologist and professor of anesthesia at McMaster University. “I do think, however, that a minority of patients will place greater value on the possibility of overdose and death even though the absolute risk is small.”

Busse’s involvement in the study is notable, because he was the lead investigator in Canada’s 2017 opioid guideline, which suggest that initial doses of opioids be kept under 50 MME and strongly recommend that they never exceed 90 MME. The CDC opioid guideline in the United States makes similar recommendations.

Given the small risk of an overdose actually happening at 50 or 90 MME, the new study would seem to debunk both guidelines. Busse sees it a bit differently, telling me by email that the overdose calculations will help patients understand the risks associated with prescription opioids.

“Our work in this area has suggested that most people living with chronic pain, who have not found sufficient relief with non-opioid therapy, would be interested in a trial of opioids. Specifically, when provided with the evidence for benefits and harms, including the risk of overdose, that most patients in whom non-opioid therapy has proven insufficient would elect to pursue a trial of opioid therapy,” Busse said.

“By presenting the evidence to patients, and helping them to understand the anticipated benefits and harms, we can help ensure that the decisions they make are the right ones for themselves.”

Unfortunately, pain patients in the U.S. and Canada don’t get to make decisions for themselves. Decisions are made for them by doctors, pharmacists, regulators, and law enforcement. Patients increasingly have trouble finding a provider willing to treat them or getting a prescription filled at a pharmacy.

And because the “voluntary” opioid guidelines are usually treated as mandatory,  patients who are prescribed opioids are often kept at ineffective low doses that are well below 90 or even 50 MME.

‘Opiods Kill and Opioids Are Bad’

Experts say the low risk of overdose from prescription opioids was established in previous studies, but people got caught up in opioid hysteria and ignored the evidence. The new study, they say, is no different.

“This paper examines well plowed ground and provides no new insight. Quite the contrary, it obfuscates through oversimplification of the problem,” says Stephen Nadeau, MD, a Professor of Neurology at the University of Florida College of Medicine. “The essential message is that opioids kill and opioids are bad.”

Nadeau says Busse and his co-authors ignored factors like genetic differences in opioid metabolism and put too much emphasis on the risk of a patient having multiple prescribers or pharmacies. The latter could simply be a sign that they were abandoned by a doctor or turned away by a pharmacy, not doctor shopping. Statistics mined from databases don’t tell you that.

“This paper takes a rigorous statistical approach to explain what is happening in a highly heterogeneous population in which there is a high probability of misconstruing the sources of variance. I think it would have been OK if published in 2015, but we have learned a thing or two since then and now the paper serves only to obfuscate and mislead,” said Nadeau.

Two findings in the study worth highlighting are that researchers found little risk of an overdose when a patient is co-prescribed opioids with benzodiazepines, sedatives or muscle relaxants – the so-called “Holy Trinity.” The overdose risk is also “small-to-trivial” when a patient is given long-acting opioids instead of short-acting ones. Those findings contradict the recommendations made in the U.S. and Canadian guidelines.

“The opioid crisis has generated interest in identifying patients at higher risk of addiction or overdose and has led to the development of several screening tools; however, these instruments have either not been validated or shown poor psychometric properties,” wrote lead author Li Wang, PhD, a researcher at McMaster University. “Our findings suggest that awareness of, and attention to, several patient and prescription characteristics, may help reduce the risk of opioid overdose among people living with chronic pain.”

One of the co-authors of the study is David Juurlink, MD, a member of Physicians for Responsible Opioid Prescribing (PROP), an anti-opioid activist group. Like several other PROP members, Juurlink disclosed that he has been a paid expert witness in legal cases involving opioids.

Previous studies have also found that the risk of overdose is small — 0.3% — in Medicaid and Medicare patients prescribed opioids for the first time. Another study of Medicare patients found that over 90% had little to no risk of overdosing. Low risk patients had only 0.006% chance of an overdose.

Guideline Recommends Topical Pain Relievers for Muscle Aches and Joint Sprains

By Pat Anson, PNN Editor

A new guideline for primary care physicians recommends against the use of opioid medication in treating short-term, acute pain caused by muscle aches, joint sprains and other musculoskeletal injuries that don’t involve the lower back.

The joint guideline by the American College of Physicians (ACP) and the American Academy of Family Physicians (AAFP) – which collectively represent nearly 300,000 doctors in the U.S. – recommends using topical pain creams and gels containing non-steroidal anti-inflammatory drugs (NSAIDs) as first line therapy. Other recommended treatments include oral NSAIDs, acetaminophen, specific acupressure, or transcutaneous nerve stimulation (TENS).

Musculoskeletal injuries, such as ankle, neck and knee injuries, are usually treated in outpatient settings. In 2010, they accounted for over 65 million healthcare visits in the U.S., with the annual cost of treating them estimated at over $176 billion.

"As a physician, these types of injuries and associated pain are common, and we need to address them with the best treatments available for the patient. The evidence shows that there are quality treatments available for pain caused by acute musculoskeletal injuries that do not include the use of opioids," said Jacqueline Fincher, MD, president of ACP.

Opioids, including tramadol, are only recommended in cases of severe injury or intolerance to first-line therapies. While effective in treating pain, the guideline warns that a “substantial proportion” of patients given opioids for acute pain wind up taking them long-term.   

The new guideline, published in the Annals of Internal Medicine, recommends topical NSAIDs, with or without menthol, as the first-line therapy for acute pain from non-low back, musculoskeletal injuries. Topical NSAIDs were rated the most effective for pain reduction, physical function, treatment satisfaction and symptom relief.

Treatments found to be ineffective for acute musculoskeletal pain include ultrasound therapy, non-specific acupressure, exercise and laser therapy.

"This guideline is not intended to provide a one-size-fits-all approach to managing non-low back pain," said Gary LeRoy, MD, president of AAFP. "Our main objective was to provide a sound and transparent framework to guide family physicians in shared decision making with patients."

Guideline Based on Canadian Research

Interestingly, the guideline for American doctors is based on reviews of over 200 clinical studies by Canadian researchers at McMaster University in Ontario, who developed Canada’s opioid prescribing guideline. The Canadian guideline, which recommends against the use of opioids as a first-line treatment, is modeled after the CDC’s controversial 2016 opioid guideline.  

After reviewing data from over 13 million U.S. insurance claims, McMaster researchers estimated the risk of prolonged opioid use after a prescription for acute pain was 27% for “high risk” patients and 6% for the general population.

"Opioids are frequently prescribed for acute musculoskeletal injuries and may result in long-term use and consequent harms," said John Riva, a doctor of chiropractic and assistant clinical professor in the Department of Family Medicine at McMaster. "Potentially important targets to reduce rates of persistent opioid use are avoiding prescribing opioids for these types of injuries to patients with past or current substance use disorder and, when prescribed, restricting duration to seven days or less and to lower doses."

Riva and his colleagues said patients are also at higher risk of long-term use if they have a history of sleep disorders, suicide attempts or self-injury, lower socioeconomic status, higher household income, rural residency, lower education level, disability, being injured in a motor vehicle accident, and being a Medicaid recipient.

A history of alcohol abuse, psychosis, episodic mood disorders, obesity, and not working full-time “were consistently not associated with prolonged opioid use.”

The McMaster research, also published in the Annals of Internal Medicine, was funded by the National Safety Council (NSC), a non-profit advocacy group in the U.S. supported by major corporations and insurers. The NSC has long argued against the use of opioid pain relievers, saying they “do not kill pain, they kill people.”