The side effects of Si Wu Tang are not clear; its contraindications are yin deficiency and fever, as well as blood avalanches and gas off the evidence of caution, and should not be used with drugs containing veratrum. Four Substance Soup has the effect of tonifying and regulating blood. It can be used to treat deficiency of Ying and Blood (deficiency of blood in the body). Symptoms include dizziness, palpitations (rapid heartbeat, often accompanied by panic), insomnia, lack of color, or irregular menstruation, scanty or closed menstruation, pain in the umbilical cord and abdomen, pale tongue, and thin stringy or astringent pulse. In modern times, this formula is often used in treating menstrual disorders in women, fetal and obstetrical disorders, urticaria, as well as allergic purpura, which are caused by deficiency and stagnation of Ying and Blood. If there is any discomfort, prompt medical attention is recommended. If medication is needed, it should be diagnosed by a doctor and the treatment should be standardized according to the doctor’s prescription.