Well I'm no help on the pred part, sorry.
But as far as the Rowasa...I didn't think of tapering until I"d been symptom free for about 3 or 4 weeks. I don't think I'd taper with blood still present. But like I said, I don't know how the pred factors in here.
Someone will be along to give you a better answer than I.
Happy Thanksgiving to you as well!