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14,595 samples completed from 41 states. Last updated Wednesday, July 30, 2025.
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603522

From Suffolk County, New York on July 10, 2025

Assumed to be heroin

3 major substances detected:

  • xylazine
  • 4-ANPP
  • fentanyl

Fentanyl is potent and the amount changes by batch. If you weren't expecting it, consider getting test strips online or from a harm reduction program. Carry naloxone (Narcan) to reverse overdoses. Don't use alone so someone can help if you go out.

Xylazine causes serious skin problems. These can happen anywhere on the body and don't heal quickly. And, xylazine can come on stronger than traditional dope and knock you out, so be mindful of your surroundings. It's best to avoid dope with xylazine. You might need medical attention to prevent long-term damage.

Looks = white, powder

Need free supplies and advice to keep you safe? Find your nearest harm reduction program at harmreduction.org

Major substances in graph:

Peak: 7.51 = xylazine

Peak: 9.14 = 4-ANPP

Peak: 10.29 = fentanyl

Method(s): GCMS

Record for Sample 603522 last updated July 29, 2025