I’ve had this urinary issue past two weeks and I’ve been on the med for about year as sleep aid.
It relaxes your muscles including your bladder, so yeah it’s possible.
I’ve never had bladder issues with my muscle relaxers. I’ve been on 2, can’t remember the first one it’s been so long. I’m on 4mg of tizanadine 3 times a day now, it’s a maintenance regime, just to always have it equally in my system 24/7.