Chinese Pulsatilla Root Classic Formulas … Natural Herb Library

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Clears toxic heat and cools the blood in the intestines ... Bai Tou Weng is one of the classic dysentery herbs for heat, blood, mucus, abdominal pain, and tenesmus.
Stops toxic diarrhea and enteric inflammation ... it is especially valued when the stool is hot, urgent, offensive, or blood-streaked rather than simply loose from deficiency.
Resolves heat toxicity in skin and lower-burner patterns ... traditional extension of use includes boils, inflammatory lesions, and some hot discharges.

Bai Tou Weng Tang ... the canonical formula for toxic-heat dysentery with tenesmus and blood.
Pairings with Qin Pi, Huang Bai, and Huang Lian ... classic lower-bowel heat and toxin logic.
Topical or wash traditions for hot inflammatory lesions and skin irritation.

Materia medica teaching consistently gives Bai Tou Weng a focused role in toxic-heat dysentery rather than a broad indiscriminate anti-diarrheal role.
Its reputation comes from cooling, clearing, and detoxifying the intestines, especially when blood and tenesmus are present.