How Long Does It Take To Breakdown Fentanyl In Your Blood Or Urine?

Usually about the same as other opiates. 2-3 days. But be wary of this, because it can stay in your system for as much as a week. I assume by "breakdown" you mean be able to pass a drug screen. Also, blood tests are more accurate, so it may be a little longer with those. Also can depend on if you're an avid user. If you have to pass a screen and you don't want to have to be sick as hell for a week, try to find some suboxone or methadone. Or if you actually want to clean yourself up, go to a methadone clinic (if one is near). Methadone saved my life. I've been on it for four years, thru a methadone clinic, and i have a wife and kid now, i couldn't imagine still shooting heroin and oxy's with the life i have now.