Nitazenes

An opioid family developed in the mid-twentieth century but never approved for human consumption. Some members can cause severe poisoning, including when unexpectedly mixed with other substances.

Evidence as of 2026-06-09

Sources

1. Nitazenes in apparent opioid toxicity deaths in Canada ? Public Health Agency of Canada; 2025-09-23
2. New psychoactive substances - the current situation in Europe ? European Union Drugs Agency; 2026-06-09

Historical and attributed reference. A source mention is not proof of current activity.