The formula of Si Wu Tang is 12g of Radix Rehmanniae Praeparata, 9g of Radix Paeoniae Alba, 9g of Radix Angelicae Sinensis and 6g of Rhizoma Ligustici Chuanxiong, i.e. Radix Rehmanniae Praeparatae: Radix Paeoniae Alba, Radix Angelicae Sinensis, Rhizoma Ligustici Chuanxiong, is 4:3:3:2. Doctors may add or subtract according to the actual situation of the patient. Four Substances Tang is a commonly used clinical formula for tonifying blood, which has the effect of tonifying blood and regulating blood. It is used for treating blood deficiency and stagnation (deficiency of blood in the body), which is manifested as dizziness and dizziness, lack of color, palpitations (rapid heartbeat, often accompanied by panic) and insomnia, or irregular menstruation in females, with scanty or closed menstruation, and pain in the umbilical cord and abdomen (lower abdomen). In this formula, Radix Rehmanniae Praeparata is an important herb for nourishing Yin and replenishing Blood (nourishing the blood in the body). Angelica sinensis nourishes Blood and harmonizes Blood. Paeonia lactiflora nourishes Blood and astringes Yin, softens the Liver and eases urgency (relieves urgent pain symptoms). Chuanxiong can activate Blood and move Qi, and when combined with Angelica sinensis, the power to move Blood is enhanced, and the herbs tonify Blood without stagnating Blood. The herbs tonify Blood without stagnating Blood, and the two herbs are used together as adjuvants. The four medicines are used together to tonify and regulate blood. The adverse effects and contraindications of Si Wu Tang are not clear. If you need to use drugs, should be used under the guidance of a doctor, not blindly self-medication.