Call us on our toll-free line
A growing concern across Canada is polysubstance use—the intentional or unintentional combination of opioids with other substances such as stimulants, alcohol, or sedatives.
This pattern of use is no longer the exception; it is increasingly the norm in many communities. In recent years, nearly half of opioid-related deaths have involved additional substances, underscoring how complex and unpredictable substance use has become.
According to the Public Health Agency of Canada, more than 49,000 apparent opioid toxicity deaths occurred between 2016 and mid-2024. Fentanyl and related substances were involved in nearly 80% of opioid-related deaths in 2024, making it the leading driver of overdose fatalities across the country.
One of the greatest dangers is that fentanyl is now commonly found in drugs sold as cocaine, methamphetamine, heroin, or counterfeit prescription pills.
Health officials have also reported rising concerns about emerging contaminants such as nitazenes, which may be even more potent than fentanyl, and xylazine, a veterinary sedative that can complicate overdose response and treatment.
Polydrug use significantly increases the risk of overdose because different drugs affect the body in opposing or compounding ways. For example,
Similarly,
making overdose more likely and more difficult to reverse.
The presence of multiple substances also complicates overdose response. While medications like Naloxone are highly effective at reversing opioid overdoses, they do not address the effects of non-opioid substances.
This means that even after naloxone is administered, individuals may remain at risk due to lingering stimulant toxicity or sedation from other drugs. As a result, emergency response protocols must account for a broader range of symptoms and longer monitoring periods.
From a treatment perspective, poly use presents additional challenges. Standard approaches designed for a single substance may be less effective when multiple dependencies are involved. Individuals may require:
to address both the physiological and psychological aspects of multiple substance use patterns.
Withdrawal management can also be more complex, as different substances produce overlapping or conflicting symptoms.
Polydrug use is often influenced by factors beyond individual choice. These include an increasingly unpredictable drug supply, where substances may be contaminated or mixed without the user’s knowledge, as well as attempts by individuals to manage withdrawal symptoms, enhance or balance drug effects, or cope with mental health challenges.
This evolving landscape highlights the need for adaptable, evidence-informed responses that include public education and coordinated care.
Addressing polysubstance use requires a shift in how addiction is understood and treated. It is no longer sufficient to focus on a single substance in isolation. Effective responses must recognize the layered realities of substance use today and provide flexible, person-centred approaches that reflect this growing complexity.
Ultimately, responding effectively to polysubstance use requires flexibility at every level of care—from policy and program design to frontline clinical practice. Clinical care must also evolve to reflect this complexity. Integrated treatment models that combine addiction services, mental health care, and medical support are better equipped to manage polysubstance use.
By recognizing the complexity of modern substance use patterns and aligning services accordingly, treatment systems can better support safety, engagement, and long-term recovery outcomes.
If you or someone you love is struggling with addiction, free and confidential recovery support is available every day. We can help you determine and take the next step.
