Opioids
U-48800
Street names: U-48800 HCl, U4 analog
Overdose? Act now. Call emergency services — say "unresponsive, not breathing". Give naloxone for opioid-like signs. Hotlines
⚡What it does
- Opioid euphoria and sedation, similar to U-47700
⚠Key risks
- Replaced U-47700 after its ban — similar death profile
- Short duration drives compulsive redosing
- Corrosive to veins and nasal tissue
✚Overdose signs
- Respiratory depression
- Pinpoint pupils
- Unresponsive
Category comparison — Opioids
| Substance | Class | Top risks | Street price |
|---|---|---|---|
| U-48800 | Unscheduled analog | Replaced U-47700 after its ban — similar death profile; Short duration drives compulsive redosing | ~$40–$100/g online |
| 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 U-48800 look like?
White powder sold as 'research chemical' opioid
What are the signs of a U-48800 overdose?
Respiratory depression; Pinpoint pupils; Unresponsive Call emergency services immediately and give naloxone if available — it reverses opioid overdoses.
How addictive is it?
Replaced U-47700 after its ban — similar death profile Dependence can develop with regular use.