I've been using the Fentanyl patch for about a month now and I'm not feeling any effects. What I mean is when I was taking oxycodone.... I felt relief within 30 minutes. I wanted to switch to the patch to avoid taking pills. I think I will tell my doctor next visit to put me back on oxycodone. After reading some post on here; it seems like a few people use both for pain management. Has anyone ever switched to the patch and then had to go back to using pills. My pain is too severe and these patches don't seem to work as well.