My Tony was my first to have blockages, and my Smokey ended up having surgery to make it easier for him to go the bathroom (he went from being a boy cat to being a girl cat with the surgery).

Smokey took longer to respond to the Baytril, I ended up having to take him back to the vet several times to get an injectable antibiotic.

I also agree with Tubby and Peanut's Mom...if you vet is not sure why Minnie is not responding, then maybe you should seek a different vet or just be blunt to the vet and say "Well, I'm not happy with that answer, I want to know what else can be done for my baby".

Keep us posted, and good luck.