819459
From Grand Rapids, Michigan on May 18, 2026
Assumed to be fentanyl, medetomidine
This is a messy brew of 8 major substances:
- glycerin
- caffeine
- diphenhydramine
- pending identification
- 4-ANPP
- p-fluorofentanyl
- fentanyl
- carfentanil
But we found lots of contaminants too, with traces of despropionyl p-fluorofentanyl + phenethyl 4-ANPP + cyclobenzaprine + lidocaine + medetomidine. Trace substances in small quantities are usually harmless, but can sometimes cause health problems. Unexpected sensations may be due to these.
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.
There are a lot of different substances in this sample. We don't know the harms that some of these can cause. Be careful and be prepared for unexpected reactions.
Looks = tan, chunky, powder
Need free supplies and advice to keep you safe? Find your nearest harm reduction program at harmreduction.org
Major substances in graph:
Peak: 2.57 = glycerin
Peak: 7 = caffeine
Peak: 7.11 = diphenhydramine
Peak: 7.15 = pending identification
Peak: 9.2 = 4-ANPP
Peak: 10.16 = p-fluorofentanyl
Peak: 10.38 = fentanyl
Peak: 11.19 = carfentanil
Method(s): GCMS
Record for Sample 819459 last updated June 1, 2026