The Fentanyl has a slow effect working on the
system. It is hard to know it is working when you are
in pain. Eventually it kicked
in and all I did was sleep. It killed my apatite, left me listless and I lost so much weight over time, I went down to 108lbs NO KNOWING it was the fentanyl doing this. One day I looked in the mirror and saw the horror of what this stuff was doing to me. I was on 50mcg every three days.