Four Substances Soup has the effect of tonifying blood and a single batch can usually be decocted twice. The decoction is mixed and divided into one serving in the morning and one serving in the evening. Four Substances Soup is composed of four herbs: Rhizoma Ligustici Chuanxiong, Radix Paeoniae Alba, Radix Rehmanniae Praeparata and Radix Angelicae Sinensis. Among them, Radix Rehmanniae Praeparata nourishes Yin and replenishes Blood (nourishes the blood in the body), Radix Angelicae Sinensis nourishes Blood and nourishes the Liver, harmonizes Blood and regulates menstruation, Radix Paeoniae Alba nourishes Blood and astringes Yin fluid, and Rhizoma Ligustici Chuanxiong activates Blood. Four Substances Soup can treat palpitations (rapid heartbeat, often accompanied by panic), insomnia, bloodlessness, dizziness, fatigue, emaciation, irregular menstruation, scanty menstruation, amenorrhea, and pain in the umbilical and abdominal regions due to blood deficiency. The adverse reactions and contraindications of Si Wu Tang are not exact. Generally, a pair of Four Substances Soup can be decocted twice, so that the active ingredients of the drug are fully analyzed, without wasting the herbs, to ensure the efficacy of the treatment. Taking Four Substances Soup requires the guidance and assistance of a doctor.