Black Morning Glory Seed Classic Formulas … Natural Herb Library

Primary Actions

Drastically expels retained water - used for edema, ascites, swollen face, and replete fluid accumulation that must be driven downward.
Purges the bowels and breaks up intestinal accumulation - appropriate for stubborn excess constipation and abdominal fullness rather than for deficiency constipation.
Drains phlegm-fluid from the chest - applied to wheezing, cough, and dyspnea when retained fluid and downward obstruction are both present.
Expels intestinal parasites - used when worm accumulation causes abdominal pain, bloating, or bowel obstruction signs.

Mu Xiang Bing Lang Wan (木香槟榔丸) - Qian Niu Zi contributes strong downward movement in formulas for intestinal accumulation, constipation, and tenesmus.
Zhou Che Wan (舟车丸) - a classic drastic formula for severe fluid retention, where Qian Niu Zi helps open the bowel route for water expulsion.
Pairings with Ting Li Zi, Sang Bai Pi, or Bing Lang - traditional strategies when wheezing, edema, parasites, and abdominal accumulation overlap.

Traditional teaching treats Hei Chou as part of the same Semen Pharbitidis medicinal as Bai Chou and Qian Niu Zi, all characterized by strong downward action and slight toxicity.
The herb belongs to the harsh expellant category and is chosen for robust excess patterns, not for weak chronic cases.
Longstanding usage emphasizes short-course supervised dosing because the medicinal goal is rapid expulsion rather than gentle regulation.