Thank you for giving me the opportunity to speak on the opioid crisis. My talk will focus on opioid agonist treatment—or OAT—and safer supply.
Opioid agonist medications, including methadone, buprenorphine and slow-release oral morphine, are usually dispensed under supervision at the pharmacy. Take-home doses are given when the patient reduces high-risk opioid use. All four medications are long-acting, potent opioids. At the right dose, they relieve withdrawal symptoms and cravings for a full 24 hours.
Research has shown that opioid agonist therapy reduces opioid use, injection-related infections and overdose deaths, even among people who use fentanyl. Unfortunately, only a minority of fentanyl users are engaged in opioid agonist treatment, and retention rates may be declining. There are several strategies to improve access to OAT and to improve treatment retention rates.
Opioid agonist treatment should be available, on site and immediately, to patients in emergency departments and hospitals, withdrawal management services and rapid-access clinics. In order to accomplish this, emergency departments and hospitals should have on-site addiction services.
Opioid agonist treatment should be available to people regardless of where they live. This can be accomplished through virtual care. Alberta's virtual opioid dependency program is highly successful and a model for the rest of the country.
There is a need to pilot and evaluate innovative medication protocols that provide quick and substantial relief of withdrawal symptoms and cravings—for example, methadone combined with slow-release oral morphine.
Community clinics that provide opioid agonist treatment should have on-site access to wraparound services—that is, primary care, mental health services and case management.
Now I'd like to discuss, briefly, safer supply programs. In these programs, hydromorphone tablets are dispensed to high-risk opioid users, sometimes in combination with opioid agonist treatment. Several studies have found that these programs are associated with a reduced risk of overdose. However, safer supply has not been directly compared to opioid agonist treatment with respect to overdose rates or rates of injection-related infections. The programs typically dispense hydromorphone tablets as a take-home medication. Patients are sometimes prescribed 30 to 40 tablets per day to take home. Safer supply patients might sell these tablets, which is called “diversion”, or they might inject them.
Diversion of take-home hydromorphone tablets appears to be common, based on clinician reports, reports from patients and families, media reports and qualitative studies. Diversion has been a major factor in other drug epidemics, including the OxyContin epidemic of the nineties and early 2000s. Reports indicate that hydromorphone tablets are being sold not just to people who use fentanyl but also to youth and to people on opioid agonist therapy. Hydromorphone tablets are very inexpensive, and even high school children can afford them. Criminal gangs are clearly involved, and these tablets are now being sold in remote communities.
Researchers in Canada have not looked at the harms of diversion and take-home hydromorphone tablets, but early research has found that youth who used diverted prescription opioid tablets were at higher risk for subsequently injecting the tablets and for switching to heroin. I personally have had patients who switched from diverted hydromorphone tablets to fentanyl. Fentanyl is also inexpensive and produces a more sustained euphoria and withdrawal relief than the tablets.
Unsupervised injection of hydromorphone tablets is also a serious problem. Evidence indicates that injection of prescription opioids increases the risk of life-threatening bacterial infections such as endocarditis.
There are several practical and evidence-based strategies that safer supply programs can undertake to improve the safety of their programs for patients and the public.
One strategy is to dispense hydromorphone tablets under supervision. Research has shown that supervised dispensing of opioid agonist medications markedly reduces the harms of diversion and unsupervised injection, while having minimum impact on treatment retention rates.
Another strategy is to combine hydromorphone with optimal doses of opioid agonist medications. Opioid agonist medications are long acting, and, thus, more effective at relieving withdrawal symptoms than hydromorphone tablets. OAT will also reduce the need to prescribe large numbers of hydromorphone tablets.