I always urinate more while on Prednisone (especially at night) but it always goes back to normal after I am off of it. Maybe you should get that checked out, just to rule anything else out that might be going on.
Diagnosed with UC in 1997
Asacol 400 3 x 3 daily
Mesalamine liquid 60 ml once daily
Prednisone 40 MG daily