how long can you stay on fentanyl
How long does fentanyl stay in your system? A: Fentanyl is an opioid that can be detected in the body through a urine test for up to 24 hours, a blood test for up to 12 hours, a saliva test for up to 2 days and a hair test for up to 90 days. This medication doesn't provide relief for that long, and it has a half-life of 219 minutes, according to Drugs.