System of the present invention provide it is a kind of using the kind skin of ovum leaf Chinese herbaceous peony as the coprostasis curative of effective component, can be smoothly discharged accumulation what enteral old waste (stool).A kind of coprostasis curative, characteristic contain following component (a) and (b): (a) the kind skin of ovum leaf Chinese herbaceous peony (Plantago ovata) in what； (b) the polyoxyethylene polyoxypropylene glycol HO- (C2 shown in following formula (1)H4O)a-(C3H6O)b-(C2H4O)c-H (1)In formula, a+c is that 3 ~ 200, b is 5 ~ 67.本發明係提供一種以卵葉車前之種皮為有效成分的便秘治療藥，其能夠順暢地排出堆積於腸內之老舊廢物(宿便)。一種便秘治療藥，其特徵在於含有以下成分(a)及(b)：(a)卵葉車前(Plantago ovata)之種皮；(b)下述式(1)所示之聚氧乙烯聚氧丙烯二醇HO-(C2H4O)a-(C3H6O)b-(C2H4O)c-H (1)式中，a+c是3~200，b是5~67。
