Soak Radix Angelicae Sinensis, Radix Paeoniae Alba, Rhizoma Chuanxiong and Radix Rehmanniae Preparata in cold water for half an hour, then add honey and fry them together, heat them to boil, and then fry them with low fire 10 minute.

The main curative effect is to treat the syndrome of deficiency and stagnation of ying blood. Palpitation and insomnia, dizziness, dark complexion, irregular menstruation, oligomenorrhea or amenorrhea, manifested as pale tongue, thin or astringent pulse.

Siwutang has some side effects, among which angelica and rehmannia hinder the stomach, so people with weak stomach and diarrhea should of course avoid taking it; Moreover, the nourishing effects of Angelica sinensis and Rehmannia glutinosa will help yin suppress yang, so people with high anemia can't apply it.

Zhang Shiwan, a famous doctor in the Qing Dynasty, expressed his opinion: "Siwu is a specific medicine for yin-blood diseases, not a prescription for regulating true yin. It shows that Siwu decoction is specially used for regulating blood, not enriching blood.