Therapeutic agent for treating ulcerative colitis

The present invention relates to a therapeutic agent for treating ulcerative colitis, which contains peony root. More particularly, the invention relates to a therapeutic agent for treating ulcerative colitis, having peony root or a Chinese medicine formulation containing peony root, which is very effective in repairing damaged tissues of ulcerative colitis and yet has no fear of side effects as those of steroids. An ulcerative colitis treating therapeutic agent which is very effective in repairing damaged tissues of ulcerative colitis and yet has no need of fear of side effects as those of steroids is provided. It is an therapeutic agent for treating ulcerative colitis which has peony root, especially, dry powders of peony root, or a Chinese medicine formulation containing peony root as an active ingredient. It is also an therapeutic agent for treating ulcerative colitis which has, as an active ingredient, an infused dry extract of peony root, an infused dry extract of a Chinese medicine formulation containing peony root, or especially an infused dry extract of Jia-Wei-Xiao-Yao-San, Dang-Gui-Shao-Yao-San, Shao-Yao-Gan-Cao-Tang, or Gui-Zhi-Fu-Ling-Wan.