Herbs that Drain Fire

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Besides clearing heat, what is another function of Xia Ku Cao (prunellae spica)?

Generates body fluids; for thirst and irritability
Clears phlegm-fire and dissipates nodules; for goiter, scrofula, lipoma, or swollen glands
Promotes urination; for jaundice and lin syndrome due to damp-heat
Clears summerheat; for thirst, difficult urination, and dry heaving

Xia Ku Cao's acrid flavor disperses clumped stagnation, such as phlegm thickened by heat, resulting in nodules and lumps.

Source: Bensky, D. (2004). Chinese Herbal Medicine: Materia Medica. Seattle, WA: Eastland Press. p. 102 [Q371]