Shearer's Pyrrosia Leaf Classic Formulas … Natural Herb Library

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Promotes urination and relieves painful urinary dysfunction ... Shi Wei is especially associated with Heat strangury, blood in the urine, and urinary difficulty from damp-heat.
Cools blood and stops bleeding ... the herb is classically used when bleeding appears in the urine or when Lung heat drives blood upward.
Clears Lung heat, transforms phlegm, and stops cough ... productive cough, wheezing, and heat-type bronchial irritation are part of its traditional range.

Shi Wei San ... classic formula context for blood strangury and painful urination.
Urinary-heat combinations with Che Qian Zi, Hua Shi, or Qu Mai ... used when burning urination and blood in the urine dominate.
Lung-heat cough pairings with Xing Ren or Chuan Bei Mu ... traditional strategy for cough with phlegm and heat.

Traditional herb references describe Shi Wei as sweet, bitter, and slightly cold, entering the Bladder and Lung to clear heat, treat strangury, stop bleeding, and relieve cough.
The herb's usefulness for both urinary and Lung presentations reflects its ability to clear heat from more than one body pathway.