The nitazenes are a family of benzimidazole opioids synthesized at CIBA in the 1950s and never approved for human use — animal studies showed them too dangerous for medicine. The drug trade disagreed: they are cheap to synthesize, easy to ship, and 10–25x fentanyl's potency.
Which ones are showing up
| Compound | Relative potency | Where it's appearing |
|---|---|---|
| Etonitazene | 10–25x fentanyl | Counterfeit pills; US Schedule I (2023); EU alerts |
| Isotodesnitazene ('ISO') | ≈ fentanyl | Heroin/fentanyl adulterant; US midwest + Baltic→EU spread |
| Metonitazene | ≈ fentanyl | US east coast; injected 'dope' supplies |
| Protonitazene | ≈ 3x fentanyl | Increasing US forensic identifications |
What changes for overdose response
- Naloxone still works — nitazenes are opioids — but higher or repeated doses are often required.
- They last long: re-sedation after naloxone wears off is common. Stay; repeat doses every 2–3 min if they re-sedate.
- Standard urine screens often MISS nitazenes — hospitals may not detect them. Tell responders what the local supply rumor mill says.
If you use any opioid in 2026Assume fentanyl, assume nitazenes, assume tranq. Carry 2+ naloxone doses, never use alone, and treat 'they woke up' as the START of the emergency, not the end.