"Siwutang's Siwu refers to angelica, Ligusticum chuanxiong, Paeonia lactiflora and Radix Rehmanniae Preparata. The composition of the prescription is angelica sinensis10g, Ligusticum chuanxiong 8g, Paeonia lactiflora12g, and Radix Rehmanniae Preparata12g, which is taken by decocting with water. Siwutang is known as the "holy prescription of gynecology", which has the effect of enriching blood and regulating menstruation, and can slow down female dysmenorrhea. "