Downward-Draining Herbs

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Besides purging the Large Intestine, what is another important action of Da Huang (rhei radix et rhizoma)?
Da Huang invigorates blood to treat things like amenorrhea, abdominal masses, or fixed pain due to injury and trauma. It can also be used externally for injury and trauma.

Source: Bensky, D. (2004). Chinese Herbal Medicine: Materia Medica. Seattle, WA: Eastland Press. p. 236-237 [Q807]