Guizhi Fuling Pill is a traditional Chinese medicine. Its main ingredients are cinnamon twigs, poria cocos, white peony root, paeonia, and peach kernel. It has the effect of promoting blood circulation and removing blood stasis. It is clinically used to treat amenorrhea caused by blood stasis, dysmenorrhea, uterine fibroids, endometriosis, ovarian cysts, and so on. Because Guizhi Fuling Pill has the effect of promoting blood circulation and removing blood stasis, taking it during menstruation may lead to an increase in the amount of menstruation or inexhaustible menstruation. This drug is generally not recommended for menstruation. It can be taken before menstruation and can be stopped when blood is seen during menstruation. But for patients with menorrhagia, which belongs to blood stasis type, menstruation can be used.