Opioids

U-47700 (Pink / U4)

Street names: Pink, U4, Pinky, u4ea, U4EA

Overdose? Act now. Call emergency services — say "unresponsive, not breathing". Give naloxone for opioid-like signs. Hotlines

⚡What it does

Linked to multiple DEATHS before scheduling — the drug behind the 2016 'pink' overdose wave
Potency ~7× morphine
Respiratory depression standard for the class
Often mislabeled/sold as other drugs

Substance	Class	Top risks	Street price
U-47700 (Pink / U4)	Schedule I	Linked to multiple DEATHS before scheduling — the drug behind the 2016 'pink' overdose wave; Potency ~7× morphine	~$20–$60/g grey-market
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.

What does U-47700 (Pink / U4) look like?

White or pink powder, pills; sold online as 'research chemical'

What are the signs of a U-47700 (Pink / U4) overdose?

Pinpoint pupils; Slow/stopped breathing; Blue lips Call emergency services immediately and give naloxone if available — it reverses opioid overdoses.

How addictive is it?

Linked to multiple DEATHS before scheduling — the drug behind the 2016 'pink' overdose wave Dependence can develop with regular use.

Facts on this page are compiled from these primary sources. External links open in a new tab.