1, Siwu decoction is composed of Radix Paeoniae Alba, Radix Angelicae Sinensis, Radix Rehmanniae Preparata and Rhizoma Chuanxiong. It is a blood tonic and is mainly used for blood deficiency syndrome. Rehmannia glutinosa in the prescription nourishes yin and blood; Angelica sinensis enriches blood and blood, which matches with Radix Rehmanniae Preparata, not only enhances the power of enriching blood, but also can stagnate blood; Radix Paeoniae Alba nourishes blood, astringes yin, softens liver, and is used together with Radix Rehmanniae and Radix Angelicae Sinensis to strengthen the power of nourishing yin and enriching blood and relieve pain. Chuanxiong can activate qi and promote blood circulation, strengthen the power of Angelica sinensis to promote blood circulation, and make all kinds of drugs enrich blood without stagnating blood.

2. Siwutang can be used to treat almost all ischemic symptoms, such as palpitation and insomnia, dizziness, pallor, irregular menstruation, scanty appetite, amenorrhea, etc. Used in modern clinic, Siwu decoction can treat nervous headache, allergic purpura, urticaria and so on.