pain
"I have been on Fentanyl patches for a number of years for numerous back issues:  scoliosis, spinal stenosis, several blown discs, S/I joint issues and more.  I started out on the 25 mcg patch.  My body became adjusted to the dosage, and my pain management doctor increased my dosage to 50 mcg, eventually with a 2 mg. Dilaudid for breakthrough pain. 

It has been a life changing drug. I probably would be bed ridden without it.  However, it does have significant side effects.  One - if you misuse it, you may stop breathing. Some days I don't use any and become agitated, nervous and hyperactive.  I'm not sure if that's due to needing to change the patch every two days rather than three. It is a good drug, but you need to take care."