Fentanyl and carfentanil are both powerful opioids that can be present in street drugs. They are very toxic and can greatly increase the risk of an overdose. Consuming even small doses can potentially be fatal.
Any street drug can be cut with, mixed or cross-contaminated with fentanyl or carfentanil. There is no easy way to detect them. It can’t be seen, tasted or smelled.
In 2018, fentanyl was found in 74 per cent of overdose deaths in Halton. There is also an increasing presence of carfentanil in the drug supply in Ontario (PDF file).