No, you will not withdraw. The
Fentanyl will prevent that. You also should have some kind of instant release opiate on hand for rescue dosing in any case. Continuous release opiates are fine as far as they go, but people's pain is rarely exactly the same all the time.
I, too, went from
Hydrocodone therapy (60mg/day) to Fentanyl patches (50ugm/3days). This turned out to be too high of a dose, and caused rapid escalation of tolerance. The Fentanyl patches tend to be prescribed too quickly as they are perceived as a low abuse threat. This is a shame, as this drug (IMHO) is a bit too strong as the "next step" from hydrocodone. First, if the hydrocodone was working, but you just needed a little more help, then it would have been best if you were titrated to a stable dose of another short acting med such as
Percocet (oxycodone & APAP) before selecting a continuous release med. Once stable on IR (instant release) opiates, then consideration of a CR (continuous release) opiate may be indicated. Too often doctors jump to a CR before properly titrating with IR meds in the first place. However I can partly allay your fears of discontinuing the Fentanyl patches. I used them for just about a year, and had no difficulty tapering off. They make a 12.5ugm/3 day patch to assist. I switched to 15mg
Oxycodone HCL (Roxicodone) Q6, (and recently Q4) and in my opinion this was "just what the Doctor ordered" (pun intended) to control my pain. If you must use the Fentanyl, be very careful not to allow it in contact of a heat source (heating pad, etc.) as people have died from this (body heat controls much of the release mechanism, and excessive heat causes rapid absorption of the opiate). Good luck, and I hope you find the relief you need.