I am currently addicted to methadone. I take 80mgs a day and I am so sick of this crap. PLEASE no replies trying to talk me out of this plan because you have no idea how much I've been theough trying to kick this and I really don't think you'd enjoy reading about it. Anyway, I have access to large amounts of fentanyl nasal spray. I really want to go to inpatient and kick this crap but methadone withdrawals last a ridiculous amount of time, whereas fentanyl, with a MUCH shorter half life, should have a much shorter withdrawal period. Now finally, here's the question: how long would I need to use fentanyl in place of methadone for my body to become fully dependent on the fentanyl rather than the methadone? Because that's the amount of time I'm going to use fentanyl as maintenance before checking into detox. If anyone can help me with methadone to fentanyl conversion rates that would be nice, too. I have a friend looking into that aspect for me but I would appreciate any extra input. Btw you'll prolly want to know how big I am and stuff right? Well I'm 6ft tall, in "average" shape (200lbs, wear size 34 jeans). I've got an "average" amount of body fat, I guess.