Po Yin Decoction consists of Radix Rehmanniae Praeparata, Radix Rehmanniae Praeparatae, Radix Paeoniae Alba, Rhizoma Dioscoreae, Rhizoma Dioscoreae Sinensis, Radix Scutellariae Radix, Rhizoma Cyperi, Radix et Rhizoma Glycyrrhizae Praeparatae, and is effective in nourishing the yin and lowering the fire (nourishing the yin and essence and lowering the fire), and purging heat and cooling the blood (alleviating the heat from the blood by purging heat).
This formula combines Radix Rehmanniae Praeparata, Radix Paeoniae Alba, Rhizoma Dioscoreae, and Rhizoma Dioscoreae to nourish the yin of the liver and kidney; Radix Rehmanniae Pterygosperma to nourish the kidney and strengthen the bones; Radix Scutellariae and Radix Phellodendron to clear away heat and expel fire and cool the Blood to remove toxins (a method of treating Blood-heat and toxins).
It is often used in the treatment of symptoms of true yin deficiency such as tiredness, dryness of mouth and tongue, irritability, insomnia, short and red urine (small amount of urine, dark yellow in color), and dry and knotty stools, or symptoms such as dribbling of menstruation and excessive menstruation caused by deficiency of yin and fire (deficiency of yin and essence in the body, and hyperactivity of fire in the body) in female patients.
The use of Po Yin Decoction should be under the guidance of a professional Chinese medicine doctor.