For me, it was different than some of the folks who comment that took pills orally. Fentanyl
is extemely strong, it stays in your system for a long
time as it is deposited into you fat cells, etc. That is the way I understand to have read it. I don't want to discourage you but for me, I just got better after day 18. Some days were brutal some were ok. What I did was worry about ME first and made no apologies. It is a fight for your life, literally. YOU come first right now.