I don't know much about drugs, maybe you're right, but I was telling what happened to me, I assure you I don't have any symptoms of Ulcerative Colitis anymore without taking any medicine for 2 months now, I'm completely normal again and hope to stay like that forever :)
Also notice that Prednisolon was only a part of the cure, vitamin e enema was the main thing that cured almost 80% of my UC and Prednisolon did the rest.