Siwu Tang can be taken all year round, but is best taken after menstruation. Siwu Tang is a classic formula in Chinese medicine for tonifying, invigorating and regulating menstruation, mainly composed of Radix Angelicae Sinensis, Rhizoma Ligustici Chuanxiong, Radix Paeoniae Alba and Radix Rehmanniae. It is especially effective in treating symptoms such as irregular menstruation, persistent menorrhagia, dysmenorrhea and amenorrhea, as well as hard lumps of blood in the abdomen, paroxysmal pain, abdominal pain in pregnancy, fetal movement or fetal malposition. Usually, this medicine can be discontinued when the patient’s disease improves and the symptoms improve significantly; while if it is used to treat dysmenorrhea or female anemia, it is best to drink it after the end of menstruation and can be taken continuously for 7-10 days. Siwu Tang can be combined with tonics, tonic but not stagnant, warm but not dry, nourishing but not greasy, and there are no obvious contraindications, so patients can take it for a long time to nourish their qi and blood. Due to the difference of individual constitution, if diarrhea, dry mouth and other discomforts occur in the process of taking it, you need to go to the gynecology department of traditional Chinese medicine to be treated by a professional doctor after identifying and treating the symptoms.