Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Huaijiao Wan (Chinese: 槐角丸) is a blackish-brown pill used in Traditional Chinese medicine to "arrest bleeding by reducing heat from blood in treating hematochezia". It tastes bitter and astringent. It is used where there is "hematochezia, hemorrhoidal swelling and pain". The binding agent is a water-honey solution. Each pill weighs about 6 grams.
State Pharmacopoeia Commission of the PRC (2005). "Pharmacopoeia of The People's Republic of China (Volume I)". Chemical Industry Press. ISBN7-117-06982-1.