What test strips actually catch — and what they miss
Drug test strips are a real harm reduction tool, but "I tested it" doesn't
mean "it's safe." Here's specifically what each strip does and doesn't tell you.
The single most important fact on this page
A negative result on any test strip never means a substance is safe. It only
means that one specific thing wasn't detected — at concentrations the strip
is sensitive enough to catch.
Strip type
Detects
Catches xylazine?
Catches medetomidine?
Fentanyl test strip
Fentanyl and some analogs
No
No
Xylazine test strip
Xylazine specifically
Yes
No
Medetomidine test strip
Medetomidine specifically
No
Yes
Because naloxone doesn't reverse xylazine or medetomidine on its own (they're
not opioids), an overdose involving them can look different — someone may stay
sedated even after naloxone is given. Give naloxone anyway if
fentanyl might be involved (it usually is, in today's supply) — it can still
reverse the opioid component and cost nothing to try. Call 911 regardless.