Opioids
AH-7921
Street names: Legal heroin, Doxylam
Overdose? Act now. Call emergency services — say "unresponsive, not breathing". Give naloxone for opioid-like signs. Hotlines
⚡What it does
- Morphine-like opioid synthesized in the 1940s; ~80% of morphine's potency
- Short history as a 'legal high' before scheduling
⚠Key risks
- Multiple UK deaths 2014–2015 (detected alongside etizolam and other NPS)
- Standard opioid overdose profile
- The case that ended the UK's 'legal high' tolerance — led directly to the PSA 2016
✚Overdose signs
- Respiratory depression
- Pinpoint pupils
- Unresponsive
Category comparison — Opioids
| Substance | Class | Top risks | Street price |
|---|---|---|---|
| AH-7921 | Schedule I | Multiple UK deaths 2014–2015 (detected alongside etizolam and other NPS); Standard opioid overdose profile | Residual |
| 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 AH-7921 look like?
White/off-white powder or tablets; sold online as 'research chemical' around 2013–2015
What are the signs of a AH-7921 overdose?
Respiratory depression; Pinpoint pupils; Unresponsive Call emergency services immediately and give naloxone if available — it reverses opioid overdoses.
How addictive is it?
Multiple UK deaths 2014–2015 (detected alongside etizolam and other NPS) Dependence can develop with regular use.