There is no fentanyl in a lidocaine patch. It is a lidocaine patch not a fentanyl patch.

The lidocaine patch is composed of an adhesive material containing 5% lidocaine that is applied to a polyester felt backing

I think it may cause problems while taking Naproxen while having a Lidocaine patch on.

Lidocaine is not morphine. They are two different compounds, though both of them are analgesics.

The lidocaine patch may have rare negative interactions with digoxin (Lanoxin) or any medications for irregular heartbeats. Some antibiotics, antidepressants, and monoamine oxidase inhibitors (MAOIs) may adversely react with the lidocaine patch