Side effects are different from us all.
I have had great success with Imuran, but went 1/2 bald on Asacol and Rowasa. I have thick hair, so it wasnt obvious to others, but my hairdresser wouldnt cut my hair anymore. It was traumatizing her watching my hair come out in her hands in chunks.
BUT..it is just hair, and it does grow back. And this side effect is rare. I was added to the inserts on Rowasa since at that time, NOBODY was reporting hair loss. I happened to work at pharmacy, and I got some time with one of the reps. Soon after that, a little paragraph was added to the side effects mentioning hair loss.
My colitis (at that time) was very responsive to the medicine though..so it was definitely worth it.