It is a course of treatment for 1-3 months, the exact duration of which varies from person to person and cannot be generalized. The composition of Siwu Tang includes Angelica sinensis, Chuanxiong rhizome, Bai Shao, and Shu Di, which has the effect of nourishing blood, soothing the meridians, and mainly treating dizziness, palpitation and insomnia caused by blood deficiency and blood stagnation, and women’s irregular menstruation. Drinking Siwu Tang is generally a course of treatment for 1-3 months, and it is best to stick to it for 7-10 days a month. It is recommended to drink it 1 hour before breakfast, lunch and dinner after menstruation to achieve the effect of replenishing blood and replenishing qi. However, the specific onset of effect of Siwu Tang varies from person to person because of the different body constitution. As a tonic, Siwu Tang is warm and dry in nature, so it is not suitable for those with excessive menstruation due to Yin deficiency and Blood heat. In addition, people with poor gastrointestinal function may suffer from diarrhea due to the intake of Angelica and Radix Rehmanniae, so they should be used with caution and consult a doctor for specific usage.