Opioids
Furanylfentanyl (Fu-F)
Street names: Fu-F, FUF
Overdose? Act now. Call emergency services — say "unresponsive, not breathing". Give naloxone for opioid-like signs. Hotlines
⚡What it does
- Opioid euphoria and sedation, slower onset than fentanyl
⚠Key risks
- Linked to hundreds of fatal overdoses 2016–2018
- Potency similar to fentanyl
✚Overdose signs
- Respiratory depression
- Unconsciousness
- Miosis (pinpoint pupils)
📋Quick facts
Also known asFu-F, FUF
CategoryOpioids
Schedule / classSchedule I (US, 2018)
AppearanceWhite/yellowish powder or pressed tablets
Street price~$20–$50/g (residual availability)
Legal statusSchedule I (US); controlled in EU/UK/Canada/Australia
Last updated2026-09-12
Sources: DEA, EMCDDA, NPS-AD
Category comparison — Opioids
| Substance | Class | Top risks | Street price |
|---|---|---|---|
| Furanylfentanyl (Fu-F) | Schedule I | Linked to hundreds of fatal overdoses 2016–2018; Potency similar to fentanyl | ~$20–$50/g |
| 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 |
| Methoxyacetylfentanyl | Schedule I | Potency comparable to or exceeding fentanyl; Tiny dosing errors fatal | Rare |
Street prices are regional estimates. Potency and cuts vary constantly — see our pressed pill guide.
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Profiles are reviewed against NIDA/DEA/EMCDDA sources. See something off? Submit a correction — it goes straight to our editorial queue.