A B.C. study estimates free take-home naloxone prevented most potential opioid poisoning deaths, underscoring both the value and limits of harm reduction.
Free take-home naloxone in British Columbia prevented an estimated 76 to 80 per cent of potential opioid poisoning deaths between 2019 and 2024, according to researchers who say the findings show the scale of lives saved by harm reduction work during the toxic drug crisis.
The estimate, based on modelling and provincial data, comes as B.C. marks a decade since declaring toxic drugs a public health emergency. The study’s lead author, Mike Irvine, a senior scientist at the B.C. Centre for Disease Control, said the result reflects the work of teams across the province that have expanded access to naloxone.
“It’s quite an incredible number to think about,” Irvine told CBC News. “What that situation would look like if these weren’t available, is not worth thinking about.”
The findings also underline the limits of emergency response alone. The B.C. Coroners Service recorded 12,356 deaths from the toxic drug crisis during the study period, a toll Irvine said shows how much more work remains to prevent poisonings before they happen.
Nasal and intramuscular naloxone are available for free across B.C. through the Take Home Naloxone program. But Irvine said access to harm reduction resources is not equal across the province, and researchers focused on 2019 to 2024 because the period included major changes in the toxicity of the unregulated drug supply as well as pandemic-era shifts in service access.
Researchers also found that harm reduction measures can sharply reduce the risk that a drug poisoning becomes fatal. Irvine said about one in 10 drug poisoning events ends in death, but that falls to one in 20 when interventions such as naloxone or overdose prevention sites are involved. The report estimated overdose prevention and supervised consumption sites prevented about 340 potential deaths per 100,000 people who injected drugs during the period studied.
Alexis Crabtree, a public health physician at the BCCDC who leads the Take Home Naloxone program, said naloxone remains an important safety tool because it can be carried by people who do not use substances as well as those who do.
Still, Crabtree said the province needs to work “upstream of naloxone,” including strengthening prevention, treatment and recovery systems. She also pointed to education for young people and culturally grounded supports, including land-based healing, given the disproportionate impact of the crisis on Indigenous people.
Bernie Pauly, a scientist with the Canadian Institute for Substance Use Research, said reducing deaths among people experiencing homelessness will also require attention to housing, trauma support and counselling. She warned that displacement can push people away from help, worsening isolation and stress.
The study’s central message is stark: naloxone is preventing many deaths, but the continuing toll from toxic drugs means B.C.’s next challenge is not only responding faster to overdoses, but preventing more poisonings from occurring at all.
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