Hi, I've received Fentanyl patches with increasing strength for the last 6 − 8 months (now at 100 ug) to manage the pain related to my advanced prostate cancer. — I am aware that nausea is one of the side effects of Fentanyl, but I also read that the nausea recedes over time. In my case, however, like clockwork 12 hours after applying the patch, I have severe episodes of (dry) retching that are getting worse each time I apply a new patch. My doctors don't know what to do. Does anybody here have experience with this phenomenon? What have you done to address the problem? Thanks!!