Siwu Tang Wan (simplified Chinese: 四物汤丸; traditional Chinese: 四物湯丸) is a brownish-black pill used in traditional Chinese medicine to "normalize menstruation and enrich blood".
[1] It is aromatic and tastes slightly sweet and bitter.
It is used where there is "deficiency of blood, and irregular menstruation".
[2] The name Siwu Tang Wan literally means Pill of Four Substances in Chinese.