I went cold turkey off of 7 10/325 mg Percocet after 7 years. I am still in pain so my Dr prescribed Gabapentin 300 mg tid. This did not touch the pain so he added Cymbalta. I have taken 1 30 mg Cymbalta for 2 days. The nurse told me to give the Cymbalta a few weeks to start working. I can't wait that long, my pain level is at an 8. I want to use my Fentanyl patches, so I need to know how long it takes Cymbalt to leave my system after taking 2 delayed release capsules.