Yes! I've been on this board for one year now and this question has been asked a few times. If you do a curezone search on this subject, I'm sure you'll find the right posts.
The Epsom Salts do not in any way exacerbate ulcerative colitis. If you are all worried, I would just do 1 tsp of Epsom Salts in each of the drinks at night...and see how you feel. Then in the morning take 1 tbsp in that ES drink.