Opioids
o-Methylfentanyl (ortho-Methylfentanyl)
Street names: 2-methylfentanyl, ortho methyl fent, China White (sold as)
Overdose? Act now. Call emergency services — say "unresponsive, not breathing". Give naloxone for opioid-like signs. Hotlines
⚡What it does
- Positional-isomer fentanyl — same opioid effects at similar potency
- Sedation, euphoria, respiratory depression
⚠Key risks
- Top US designer-opioid trend of 2025 (Aegis laboratory data)
- Positional isomers can EVADE standard fentanyl immunoassays — a 'negative' strip does not clear it
- Same 2-mg-lethal range as fentanyl
- Drives cluster overdoses when it enters a pill supply
✚Overdose signs
- Pinpoint pupils
- Respiratory arrest
- Cyanosis, limp body
Category comparison — Opioids
| Substance | Class | Top risks | Street price |
|---|---|---|---|
| o-Methylfentanyl (ortho-Methylfentanyl) | Schedule I | Top US designer-opioid trend of 2025 (Aegis laboratory data); Positional isomers can EVADE standard fentanyl immunoassays — a 'negative' strip does not clear it | ~$20–40 per counterfeit pill |
| Heroin | Schedule I | Extremely addictive — physical dependence in weeks; Overdose: breathing slows or stops | ~$10–$40 per bag |
| Fentanyl | Schedule II | Respiratory depression; Addiction in days | ~$20–$40 per counterfeit pill |
| Fentanyl HCl (powder) | Schedule II / analogue prosecutions | Lab-purity powder is far stronger than street mixes; Weighing errors are fatal | ~$60–$120/gram wholesale equivalent |
| Acetylfentanyl | Schedule I | ~5–15× weaker than fentanyl but still deadly at gram-level mistakes; Frequent cause of cluster overdoses | ~$25–$60/g where found |
| Furanylfentanyl (Fu-F) | Schedule I | Linked to hundreds of fatal overdoses 2016–2018; Potency similar to fentanyl | ~$20–$50/g |
Street prices are regional estimates. Potency and cuts vary constantly.
?Frequently asked questions
What does o-Methylfentanyl (ortho-Methylfentanyl) look like?
White powder; pressed into counterfeit pills; sold as 'heroin' or 'fentanyl'
What are the signs of a o-Methylfentanyl (ortho-Methylfentanyl) overdose?
Pinpoint pupils; Respiratory arrest; Cyanosis, limp body Call emergency services immediately and give naloxone if available — it reverses opioid overdoses.
How addictive is it?
Top US designer-opioid trend of 2025 (Aegis laboratory data) Dependence can develop with regular use.
🔗Sources & further reading
Facts on this page are compiled from these primary sources. External links open in a new tab.