Tongjing Wan (simplified Chinese: 痛经丸; traditional Chinese: 痛經丸) is a brownish-black pill used in Traditional Chinese medicine to "promote blood flow, dispel cold, regulate menstruation and relieve pain".
[1] It tastes slightly sweet and bitter.
It is used where there is "abdominal pain during menstruation due to stagnation of blood by cold ".
[2] Tongjing Wan is to be taken before menstruation.