t wait hours for it to kick in you can put a heating pad on the fentanyl
patch, the heat releases the fentanyl
from the patch alot quicker, there for reducing the waiting period substantialy. Also..normally you will change the patch every 72 hrs, but at the end of 48 hrs you can put another patch on, and remove the old patch as directed, usually after 72 hrs. This will keep a continous level of fentanyl in your system, and according to my experience and my Dr. it is safe to do.