W-15
Limited data
Limited data
Sparse data. Doses and effects may be unreliable or untested.
- 2 corroborating sources
- no dose data
- toxicity data
- classified Tentative
- classified Research-chemical
- 2 corroborating sources
- no dose data
- toxicity data
- classified Tentative
- classified Research-chemical
Summary
W-15 is a research chemical patented in the 1980s as a candidate analgesic and later sold online as a relative of the fentanyl-family opioids, usually with the patent-era claim of '5.4x morphine' potency. Modern receptor pharmacology could not reproduce that claim: like W-18, W-15 showed no detectable opioid-receptor agonist, antagonist, or allosteric activity when screened, and its actual mechanism, dose, and toxicity in humans are unknown. Treat any sample sold under this name as an unknown: products sold as W-series compounds have contained actual fentanyl analogues, so an opioid-type overdose from such a sample remains possible (naloxone is still worth giving), while the compound itself may carry entirely uncharacterised risks with no established safe dose.
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