Molecular model of fentanyl.
3

How long does fentanyl stay in the system?

Fentanyl effects can be felt for several hours.

Fentanyl effects can be felt for several hours. Effects may be longer when fentanyl skin patches are used, since they slowly release the drug over time.

Someone who recently used fentanyl may test positive on a urine drug test for several days after consuming the drug.

Reviewed and updated by Jules Netherland, PhD, and Dr. Sheila P. Vakharia on 5/2/2023.

A young woman holds a sign that says "End the Drug War."

Sign up for updates from DPA.