Chronic Pain Patients Report Improvement from Cannabis Oil

By Pat Anson, PNN Editor

Patients with chronic pain and other illnesses who did not respond to conventional treatment reported improvements in pain, anxiety, depression, fatigue and quality of life after being prescribed cannabis oil for three months, according to a large new Australian study. There were no improvements in patients with insomnia.

Researchers at the University of Sydney surveyed 2,327 patients with chronic health issues who were prescribed cannabis oil products containing cannabinoids, delta-9-tetrahydrocannabinol (THC) and cannabidiol (CBD). The oils are made by Little Green Pharma , a company that specializes in cannabis-based medicine and provided funding for the Quality of Life Evaluation Study (QUEST Initiative).

Over two-thirds of the participants (69%) suffered from chronic pain. Half were being treated for more than one health condition; and one in four were unemployed, on leave, or had limited work duties due to illness.   

Medical cannabis was legalized in Australia in 2016. Cannabis is only available by prescription in Australia to patients with health conditions that are unresponsive to conventional treatment.

“Short-term findings over 3-months indicate that patients prescribed MC (medical cannabis) in practice have improved HRQL (health-related quality of life) and reduced fatigue. Patients experiencing anxiety, depression, or chronic pain also improved in those outcomes over 3-months, but no changes in sleep disturbance were observed in patients with sleep disorders,” researchers reported in PLOS ONE.  

“The study continues to follow patients over 12-months to determine whether improvements in PROs (patient reported outcomes) are maintained long-term. In addition, further subgroup analyses will be undertaken to determine whether patients with specific health conditions have better outcomes compared with others when using validated condition-specific questionnaires.”

The researchers did not measure adverse effects in the QUEST Initiative, but 30 participants withdrew from the study due to “unwanted side effects.” The authors noted that more research on cannabis oil products used in the study is needed in order to successfully treat patients with insomnia and sleep disorders.

Another recent survey in Australia of patients with chronic illness found significant improvements in their physical and mental health after they started using medical cannabis. Most of the cannabis products in that study were oils containing CBD and/or THC.   

Australian Guideline Calls for Safer Opioid Tapering

By Pat Anson, PNN Editor

Public health experts in Australia have released what is being called the first international guideline to help primary care doctors safely reduce or stop prescribing opioids to adults with chronic non-cancer pain.

The Guideline for Deprescribing Opioid Analgesics contains 11 recommendations developed by a panel of general practitioners, pain specialists, addiction specialists, pharmacists, nurses and physiotherapists. The guideline emphasizes slow and individualized tapering for patients when long-term opioid use does not improve their pain and quality of life or when they experience adverse side effects. Tapering is not recommended for anyone nearing the end-of-life.

“Internationally, we were seeing significant harms from opioids, but also significant harms from unsolicited and abrupt opioid cessation. It was clear that recommendations to support safe and person-centred opioid deprescribing were required,” said lead author Aili Langford, PhD, a pharmacist and Research Fellow at Centre for Medicine Use and Safety, Monash University.

Millions of pain patients in the U.S. were tapered or cut off cold turkey after the CDC released its 2016 opioid prescribing guideline. Both the American Medical Association and the FDA warned that rapid tapering was causing “serious harm” to patients, including withdrawal, uncontrolled pain, substance abuse and suicide.

In response to that criticism, the revised 2022 CDC guideline took a more cautious approach to tapering, recommending a dose reduction of just 10% a month, a much slower rate than the 10% a week that the agency previously recommended.

The U.S. Department of Veterans Affairs and Department of Defense (VA/DoD) also modified their approach to tapering, which at one time called for tapers of up to 20% every four weeks.  The updated VA/DoD guideline says there is “insufficient evidence to recommend for or against any specific tapering strategies.”

The Australian guideline doesn’t get caught up in fractions or percentages. It simply calls for “gradual tapering” that is tailored to each patient’s needs and preferences. A key recommendation is to discuss tapering as early as possible with patients, to develop a plan when they are first prescribed opioids.  

“Shared decision-making and ensuring that patients have ways to manage their pain are essential when a deprescribing plan is being discussed,” said Liz Marles, MD, a general practitioner and clinical director at the Australian Commission on Safety and Quality in Health Care.  

“These new guidelines further support appropriate use of opioid analgesics and how to safely prescribe and stop prescribing them. They ask clinicians to consider reducing or stopping opioids when the risk of harm outweighs the benefits for the individual.”

One in five adults in Australia have chronic pain, but few actually wind up taking opioids long-term. The guideline authors estimate that only 5% of opioid “naive” patients become long-term users, well below misleading claims by anti-opioid activists that over 25% of pain patients develop opioid dependence or opioid use disorder.

“I am curious to know how many people who are on chronic opioid therapy feel a need to be tapered,” said Lynn Webster, MD, a pain management expert and Senior Fellow at the Center for U.S. Policy.  “Only 5% of opioid-naïve patients remain on opioids for 3 months or longer. Considering the fact that about 10% of the population has severe enough pain to affect quality of life, this statistic argues against the theory that just being exposed to an opioid leads to chronic opioid use.”

Webster says most of the recommendations in the Australian guideline are practical, but he’s concerned that some of the evidence used to support them is “misunderstood and misleading.”

“They make it abundantly clear that tapering should not be forced and that there are serious consequences to forced tapering. But they also use the common yet flawed statement that there is little evidence that opioids are effective for chronic non-cancer pain. Of course, the lack of evidence is not evidence,” Webster said.

Although opioids have been used for thousands of years for pain relief, the clinical evidence for or against their use remains thin. Most of the evidence used to support the Australian guideline was deemed by the authors to be insufficient, unclear or weak. Only one of the 11 tapering recommendations was supported by evidence of “moderate certainty.”

Cannabis Study Finds ‘Significant Improvements’ in Physical and Mental Health

By Pat Anson, PNN Editor

The use of medical cannabis was associated with “significant improvements” in physical and mental health in a large survey of Australian adults suffering from chronic pain and other health problems.

Over 3,100 people participated in the survey. Chronic non-cancer pain was the most common condition reported (68.6%), followed by cancer pain (6%), insomnia (4.8%) and anxiety (4.2%).  

Australia has relatively stringent rules for medical cannabis. Patients have to exhaust all other forms of treatment and consult with a physician, who reviews their medical history and suitability for cannabis before writing a prescription.

Most of the prescriptions for survey participants were for cannabis products taken orally, such as oils and capsules, with only a small number for dried cannabis flower. About 80% of the cannabis products were rich in cannabidiol (CBD), with the rest dominant in tetrahydrocannabinol (THC) or a balanced mix of CBD and THC.

Patients were asked to rate their wellness and quality of life in eight categories on a scale of 0-100, including general health, body pain, physical functioning, physical limitations, mental health, emotional limitations, social functioning and vitality. The surveys were conducted at the start of the study and then every 45 days after cannabis therapy was initiated, with a total of 15 follow up surveys.   

The study findings, recently published in JAMA Network Open, showed sustained improvement in all eight wellness categories after participants started taking cannabis, with body pain improving an average of 10 to 15 points on the 100-point scale. Researchers also found “pronounced and statistically significant improvements” in mental, social and emotional health.

“This study suggests a favorable association between medical cannabis treatment and quality of life among patients with a diverse range of conditions. However, clinical evidence for cannabinoid efficacy remains limited, and further high-quality trials are required,” wrote lead author Thomas Arkell, PhD, a psychopharmacologist at the Swinburne University of Technology in Melbourne.

Adverse events such as sleepiness and dry mouth were relatively common during cannabis therapy, but were usually mild or moderate.

Before starting cannabis therapy, patients were taking an average of nearly five medications a day, the most common being simple analgesics (54%), opioids (48%), antidepressants (45%), benzodiazepines (34%) and gabapentinoids (22%). The study did not examine if medication use declined once participants started taking cannabis.  

“While we cannot exclude the possibility that adverse events may have been caused in whole or part by the disease state and concomitant medications, the relatively high incidence of adverse events still affirms the need for caution with THC prescribing and careful identification of patients with contraindications,” Arkell wrote.

Medical cannabis was legalized in Australia in 2016. Since then, over 332,000 Australians have been given cannabis prescriptions, mostly for chronic pain (55%), anxiety (23%) and sleep disorders (6%).

Pain management experts in Australia have long taken a dim view of cannabis. In 2021, the Australian and New Zealand College of Anaesthetists released new guidance urging doctors not to prescribe medical cannabis for chronic non-cancer pain because of a lack of good quality research.

Turning From Victim to Victor After Being Electrocuted

By Gabriella Kelly-Davies, PNN Columnist

Kim Sullivan’s life changed irrevocably one Black Friday in 1998 when she was electrocuted in a swimming pool. At the time, Kim was enjoying life as a graphic designer and busy mum with two young daughters. They lived on a nine-acre property near the beach in Australia’s Far North Queensland, surrounded by lush tropical rainforest and fruit trees.

“My remote life was idyllic, the perfect place to bring up a growing family,” she recalls.

Kim and her family were staying with friends in Cairns, a city in Queensland, so they could buy groceries and run some errands. It rained overnight, and they woke to a stifling hot, sticky morning. Kim’s daughters asked her if they could swim, so she put on their floaties, and they headed to the kidney-shaped pool in the backyard.

The two girls swam at the front end of the pool near the steps, while Kim kept an eye on them from the edge, still in her white cotton pajamas. Her daughters asked her to turn on the spa jets, so she went down to the spot that housed the electrical switches and turned the dials.

Meanwhile, Kim’s daughters had jumped from the pool. As she joined them, they started screaming. Distraught, they kept falling over and trying to stand up. When Kim wrapped her arms around their little bodies to comfort them, she felt an electric current surge up her legs.

Kim fell to her knees, and then an invisible force catapulted her three meters into the air. She landed in the pool, dazed and barely conscious.

KIM SULLIVAN

Kim’s muscles froze and she struggled to move, but she somehow maneuvered herself to the edge of the pool, all the while screeching at her children to run inside the house. She tried to get out, but when she touched the pebblecrete, it buzzed with 240 volts of electricity.

“It was the most painful experience I ever encountered,” she recalls, “even worse than childbirth.”

Afterwards, blisters formed on Kim’s fingertips. They burned and stung. She had excruciating pain running up the insides of her arms and under her armpits, and a similar pain up the backs of her legs. Her neck and shoulders ached, and so did her lower back. She struggled with a constant headache that tormented her.

Exhausted and traumatized, Kim couldn’t touch a hot cup or put her hands in warm water. Doing up a zipper or buttons was impossible, and her constant flashbacks triggered panic attacks. Her terrifying nightmares disrupted her sleep, leaving her bone tired.

All too soon, Kim fell into a deep depression, and she struggled to look after her family because of crippling headaches, chronic back and neck pain, and debilitating attacks of shingles. She felt shattered with exhaustion every morning when she woke up.

Kim could no longer work as a graphic designer, and she was unable to do the things that previously gave her pleasure because of her chronic pain and fatigue. In the end, she had to rely on a government homecare service to clean her house, change the bedsheets and cook meals for her family. She felt guilty and ashamed about using a service designed for elderly people, and her confidence plummeted.

Learning How to Manage Pain

Kim spent years on the medical merry-go-round consulting rheumatologists, psychiatrists, neuropsychologists, naturopaths, physiotherapists, acupuncturists and massage therapists. But nothing eased her intractable pain or depression. Eventually, she took part in a multidisciplinary pain management program at a regional hospital.

“The defining moment for me was when my doctor explained how the electric shock had disrupted the way my brain cells communicated with my spinal cord and nerve endings. The electric current caused a malfunction in the way my nervous system processed pain signals. My doctor reassured me that my symptoms were normal responses to an electric shock and that I could learn techniques to reduce their impact on my life,” Kim explained.

During the pain management program, Kim started doing carefully graded exercise, gentle yoga and meditation, and she learned psychological techniques that changed the way she thought about and responded to her pain. She also learned to pace herself rather than her usual pattern of doing too much, triggering a flare-up and having to rest in bed for several days.

“I learned valuable techniques on how to manage my pain,” she said. “But it wasn’t easy. It took a lot of practice and patience to master such a different way of living with a disabling condition that had radically transformed my life.”

Once Kim understood why she was the way she was, she stopped feeling stigmatized by people she felt judged her. “Pain is invisible, and people think it’s all in your head. They think you’re a drug-seeker or a malingerer and hypochondriac. Some even claim you are just lazy and looking for attention,” Kim told me.

After the program, Kim focused on being as healthy as she could by carefully managing what she was doing and not overdoing things. Every day she goes for a long walk that energizes her, and she does a carefully graded exercise program with an exercise physiologist. She also meditates and does yoga.

“I still have bad days, but through it all, I feel more confident that I can self-manage my symptoms rather than spiraling back into dependency and brain fog. I was lucky to have an amazing support team. Through them I gradually realized that to turn from victim to victor, I needed to take control by self-managing my condition,” Kim said.

Kim is now an advocate for people living with chronic pain and eager to share what she’s learned.

“Self-management gives you the freedom to make your own choices and not rely on opioids or passive treatments by doctors and other health professionals. The benefits of passive treatments are usually short-lived, and they are expensive. They also disempower you. Self-managing your pain empowers you and boosts your confidence,” she said.

“By sharing my story, I hope I can help people like me who have tried everything, but nothing worked for them. I want to raise awareness of chronic pain and reduce its stigma and social isolation so that more people who live with pain can enjoy a better life.”

Gabriella Kelly-Davies lives with chronic migraine.  She recently authored “Breaking Through the Pain Barrier,” a biography of trailblazing Australian pain specialist Dr. Michael Cousins. Gabriella is President of Life Stories Australia Association and founder of Share your life story.

Few Patients on Long-Term Opioids Engage in Risky Behavior

By Pat Anson, PNN Editor

Only a small percentage of pain patients on long-term opioid therapy ask for higher doses, renew their prescriptions early or divert their medication to another person, according to a new study that challenges many common assumptions about prescription opioids.

For five years, Australian researchers followed over 1,500 patients taking opioid pain medication, with annual interviews asking them about their opioid use and behavior. The study is believed to be the first of its kind to follow patients on opioid therapy for such a long period.   

Most of the patients suffered from chronic back, neck or arthritis pain, and were taking opioids for at least 6 weeks at the start of the study, including about 15% who were taking high doses exceeding 200 MME (morphine milligram equivalent) per day. The CDC opioid guideline recommends that daily doses not exceed 90 MME.  

Researchers found that “problematic opioid use” was infrequent and steadily declined over time, with less than 10% of patients asking for higher doses or for a prescription to be renewed early. Less than 5% of patients tampered with their medications or diverted them to another person.     

“Contrary to the predominant thinking in pain management, the findings of this study suggest considerable fluidity in opioid use over time among many patients with CNCP (chronic non-cancer pain) who use opioids,” wrote lead author Louisa Degenhardt, PhD, Deputy Director of the National Drug and Alcohol Research Centre at University of New South Wales.

By the end of the study, patients were more likely to have stopped taking opioids (20%) than they were to be diagnosed with opioid dependence (8%), suggesting that long-term opioid use does not always lead to dependence or addiction. Even when they were diagnosed as opioid dependent, most patients did not meet the criteria for dependence the following year, suggesting the original diagnosis was faulty.

JAMA Network Open

Researchers noted there was “substantial variation” in how patients answered questions from year to year about their opioid use and behavior. Most who reported risky behavior did so in only one of the annual interviews.  

“This finding challenges a common view that the risk of opioid-related behaviors is static and that risk assessment at the start of opioid treatment can predict which patients will develop opioid use disorder,” researchers concluded in JAMA Network Open. “By contrast, individuals who engage in opioid-related behaviors change over time, which also suggests that opioid behaviors of concern need not persist.”

“This study shows what most clinicians treating CNCP with opioids already know, which is that most individuals do fine with chronic opioid therapy. It is only a few people who develop a problem, and that can’t be easily predicted based on a person's early behaviors associated with opioids prescribed for pain,” said Dr. Lynn Webster, a PNN columnist and past president of the American Academy of Pain Medicine.

“It refutes the argument that patients on chronic opioid therapy inevitably will abuse, become addicted, or never cease using opioids once started.” 

Webster noted that most people in the study were stable and few demonstrated any abuse or harm from opioids, including those on high doses who were less likely to ask for more medication.

“I think the overriding message of this study is that the one-size-fits all approach to using opioids for CNCP is flawed. The idea that everyone should be at a low level doesn't address individual needs,” Webster said.

No Relationship Between Rx Opioids and Injury Deaths

Another new study that challenges conventional thinking about prescription opioids found that high doses are not associated with higher rates of trauma-related death.

Researchers at Case Western Reserve University looked at mortality rates in all 50 states from 2006 to 2017, comparing them to the amount of opioids prescribed during the same period.

The researchers believed they would find a relationship between opioids and higher death rates. Their theory was that people on opioids were more likely to be impaired, which would lead to more car crashes, accidents, drownings, suicides and other types of trauma death.

But in findings reported in the journal Injury, there was no association between the two.

“In every state examined, there was no consistent relationship between the amount of prescription opioids delivered and total injury-related mortality or any subgroups, suggesting that there is not a direct association between prescription opioids and injury-related mortality,” wrote lead author Esther Tseng, MD, a trauma surgeon and professor at CWRU.

It's important to note that Tseng and her colleagues did not look at fatal overdoses caused by prescription opioids. Previous research by the CDC has found that deaths linked to opioid pain medication have been relatively flat for nearly a decade. The vast majority of overdoses involve illicit fentanyl and other street drugs.    

Doctors Advised Not To Prescribe Cannabis for Chronic Pain

By Pat Anson, PNN Editors

Pain management experts around the world are becoming more vocal about the growing use of medical marijuana as a treatment for chronic pain, saying there is little evidence to support the use of cannabis as an analgesic.

Today the Faculty of Pain Medicine at the Australian and New Zealand College of Anaesthetists (ANZCA) released new guidance urging doctors not to prescribe medical cannabis for patients with chronic, non-cancer pain unless they are enrolled in a clinical trial.

“Until there are results from high-quality, unbiased clinical trials which establish the effectiveness and safety of medicinal cannabis in treating chronic pain, the Faculty of Pain Medicine does not believe cannabinoid products should be prescribed,” Mick Vagg, MD, Dean of the Faculty of Pain Medicine, said in a statement.  

“We want to highlight to healthcare providers that currently available medical cannabis products are not even close at this stage to showing that they deserve a place in the management of the complex patients who suffer from ongoing pain. We believe clinicians will welcome this clear guidance.”

ANZCA is a professional society for nearly 8,000 anesthesiologists and pain management specialists in Australia and New Zealand, and sets standards for pain medicine in both countries.

Australia and New Zealand have some of the highest rates of cannabis consumption in the world. But New Zealand only allows medical cannabis for terminally ill patients, while Australia requires a prescription for cannabis that is often difficult to obtain.

About one if five Australians live with chronic pain.   

“Medical cannabis products are not even close at this stage to showing that they deserve a place in the management of the complex patients who suffer from ongoing pain.”

— Dr. Mick Vagg

“By far the most common reason for the use of medicinal cannabis in this country is chronic pain − however there is a critical lack of evidence that it provides a consistent benefit for any type of chronic non-cancer pain, especially compared to the treatments we already strive to provide in pain clinics,” Vagg said.

“The research available is either unsupportive of using cannabinoid products in chronic non-cancer pain or is of such low quality that no valid scientific conclusion can be drawn. Cannabidiol-only formulations have never been the subject of a published randomised controlled trial for chronic pain treatment, yet they are the most commonly prescribed type of cannabis product.”

Vagg also said research is lacking in how cannabinoids react with pharmaceutical drugs, particularly in relation to their sedative and psychiatric side effects.

‘Hypothesis’ of Analgesia

ANZCA’s new guidance came just days after the International Association for the Study of Pain (IASP) released a position statement saying it could not endorse the use of cannabinoids to treat pain. IASP said there were preliminary studies supporting the “hypothesis of cannabinoid analgesia,” but not enough to overcome the lack of evidence on the safety and efficacy of cannabinoids.

“While IASP cannot endorse the general use of cannabinoids for treatment of pain at this time, we do not wish to dismiss the lived experiences of people with pain who have found benefit from their use,” said Andrew Rice, MD, chair of IASP’s Presidential Task Force on Cannabis and Cannabinoid Analgesia.

“This is not a door closing on the topic, but rather a call for more rigorous and robust research to better understand any potential benefits and harms related to the possible use of medical cannabis, cannabis-based medicines and synthetic cannabinoids for pain relief, and to ensure the safety of patients and the public through regulatory standards and safeguards.”

Rice said IASP was concerned that laws allowing the use of medical marijuana were being adopted without the same rigor and regulatory procedures that are followed for pharmaceutical products. Patients who self-treat their pain with cannabis are also at risk, according to Rice, because their doctors often don’t know about their cannabis use.  

“IASP is also calling for the delivery of a comprehensive research agenda. Priorities include identifying patients with pain who may receive the most benefit from cannabis or cannabinoids, and who may be at risk of the most harm,” said former IASP president Lars Arendt-Nielsen, MD, who co-chaired the Cannabis Task Force.

Supporters of medical cannabis dispute the contention that there is inadequate evidence about the use of cannabis for pain.

“These recommendations are political, not scientific. Several peer-reviewed trials have concluded that inhaled cannabis is safe and effective for treating various types of pain, in particular neuropathic pain,” Paul Armentano, Deputy Director of NORML, said in an email to PNN.

Armentano cited a 2017 study from the U.S. National Academy of Sciences, which found “conclusive or substantial evidence” that cannabis is an effective treatment for chronic pain.

“In the real world, the therapeutic use of cannabis is rising among chronic pain patients, many of whom are substituting it in place of opioids. In jurisdictions where cannabis is legally available, chronic pain is the most qualifying condition among medical cannabis patients enrolled in state-specific access programs. To willfully ignore these data is indicative that political considerations, rather than scientific considerations, influenced this group’s decision,” Armentano said.

Studies Warn of Pregabalin Deaths

By Pat Anson, Editor

Two new studies – one in Canada and one in Australia – should give pause to patients who use opioids and pregabalin (Lyrica), an anticonvulsant medication increasingly prescribed for fibromyalgia, neuropathy and other chronic pain conditions. Both studies found a number of overdose deaths that involve – but were not necessarily caused -- by pregabalin.

The Canadian study, published in the Annals of Internal Medicine, looked at over 1,400 patients in Ontario on opioid medication from 1997 to 2016 who died from opioid-related causes. Another group of over 5,000 surviving opioid patients was used as a control group.

Researchers found that patients who were co-prescribed opioids and pregabalin had a significantly higher risk of an overdose.

The risk of death was over two times higher for patients receiving opioids and a high dose of pregabalin (over 300mg) compared to those who took opioids alone.

Patients on a low or moderate dose of pregabalin also had a heightened risk, although not as large.

Researchers say pregabalin has a sedative effect and may interact with opioids in ways that increase respiratory depression. Few doctors and patients are aware of the risk, even though over half of Ontario residents who begin pregabalin therapy are also prescribed an opioid.

"There is an important drug interaction between opioids and pregabalin that can lead to increased risk of fatal overdose, particularly at high doses of pregabalin," lead author Tara Gomes, PhD, of the Institute for Clinical Evaluative Sciences (ICES) and St. Michael's Hospital in Toronto, told MedPage Today.

"Clinicians should consider carefully whether to prescribe opioids and pregabalin together. If they decide that both medications are clinically appropriate, they should start with low doses and monitor their patients closely."

Lyrica (pregabalin) and Neurontin (gabapentin) are both made by Pfizer and belong to a class of anticonvulsant nerve medication called gabapentinoids. Sales of gabapentinoids have tripled in recent years, in part because of CDC prescribing guidelines that recommend the drugs as alternatives to opioid medication.  

U.S. health officials have only recently started looking into the misuse and abuse of gabapentinoids, which are increasingly used by addicts to enhance the euphoric effects of heroin and other illicit opioids. While gabapentin  has a warning label cautioning users who take the drug with opioids, there is no similar warning for pregabalin.

“Although current product monographs for gabapentin contain warnings about serious adverse events when this agent is combined with opioids, those for pregabalin do not. The importance of our finding warrants a revision of the pregabalin product monographs,” wrote Gomes.

Pregabalin Abuse in Australia

Health officials in Australia are also concerned about the growing use of pregabalin.  Researchers at the NSW Poisons Information Centre say poisoning cases involving pregabalin rose from zero in 2005 to 376 cases in 2016.

“Our study shows a clear correlation between the rapid and continuous rise of pregabalin dispensing and an increase in intentional poisonings and deaths associated with pregabalin,” said lead author Dr. Rose Cairns, a specialist at the NSW Poisons Information Centre.

According to the Australian Journal of Pharmacy (AJP), there have been 88 recorded deaths associated with pregabalin in recent years. Most of the deaths involved young, unemployed males who had a history of substance abuse, particularly with opioids, benzodiazepines, alcohol and illicit drugs.

“We believe that Australian doctors may not be aware of the abuse potential of pregabalin,” Cairns said. “Most patients who are prescribed this medication are in the older population but the group who are at high risk of overdosing are much younger. These people are likely to have been prescribed pregabalin despite having a history of substance abuse.”

According to researchers, up to two-thirds of people who intentionally misused pregabalin had a prior documented substance abuse history. “Prescribers need to consider this growing body of evidence that pregabalin has abuse potential before prescribing, especially to patients with substance abuse history,” said Cairns.

Pfizer did not respond to a request for comment on the Canadian and Australian studies.

One Million Australians Abuse Rx Drugs

By Pat Anson, Editor

Like the United States, Australia is struggling to find answers to a growing addiction and overdose crisis – and restricting access to opioid pain medication is the favored solution.

A new report by the Australian Institute of Health and Welfare (AIHW) found that a million Australians -- about 4.7% of the population – abused a prescription drug in 2016. That’s up from 3.7% in 2007.   

‘Over the past decade, there has been a substantial rise in the number of deaths involving a prescription drug, with   drug-induced deaths more likely to be due to prescription drugs than illegal drugs,’ said AIHW spokesperson Matthew James.

In 2016, there were 1,808 drug overdose deaths in Australia, but the leading cause was not pain medication. Benzodiazepines, a class of anti-anxiety medication that includes Xanax and Valium,  were involved in 663 overdoses -- compared to 550 deaths linked to opioid medications such as oxycodone and codeine.

Recent reports from Florida and Pennsylvania also show that overdoses linked to "benzos" outnumber those from pain medication, although you rarely hear about that in today’s anti-opioid climate.

Unlike the United States, where prescriptions for opioid medication have been in decline for several years, in Australia they rose by 24% from 2010 to 2015 – driven largely by a 60% increase in the rate of prescriptions for oxycodone.

Like their American counterparts, Australian regulators and health officials are responding to the overdose crisis by reducing access to opioid medication. Starting in February 2018, Australians will need a prescription for codeine, which is now widely available in over-the-counter analgesic and flu medications.  Australia is also introducing a national prescription drug monitoring system.

Economic despair and social isolation appear to be playing major roles in Australia's overdose crisis, just as they are in the United States. Earlier this year, a nationwide survey found that people living in remote, rural areas of Australia were almost twice as likely as those living in major cities to use pharmaceutical drugs for non-medical purposes.

“This finding also held true for Australians living in the most disadvantaged socio-economic areas, with 6 percent having recently misused pharmaceuticals compared with 4.2 percent of those in the most advantaged areas,” James said.

Australians who misused prescription drugs were also more likely to experience mental illness, chronic pain and psychological distress compared with those who did not misuse them.