Hopefully only short term, I was told by my doctor it was just to help your bladder train itself to correct but that you can become reliant on Oxybutynin if you use it too much, your bladder just won't work properly without it. I had urgency for a couple days after surgery but was able to stop using that drug after the second day.

Pelvic floor exercises aren't helping with it at all?

There seems to be an issue with elderly people taking oxybutynin.

“As far as bladder medications are concerned, immediate release oxybutynin has been shown to adversely affect cognition in the cognitively intact elderly.”