I started having an allergy to the adhesive and I quit taking the fentanyl because I need more options in pain relief and my doctor seemed really concerned about me being on the patch. I was still in so much pain on the patch. I asked my doctor to increase it in the past but she did not want to. Then I started developing the allergy. I was in so much pain the last month I was on the patch overall I determined that the box of patches I recieved was deffective. One bad thing was the patches kept coming off and you cannot put tape on top of it to stay on or the patch will be less effective.