Knowledge Base/Herbs/Pyrrosia Leaf
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利水渗湿药（利尿通淋） · Damp-draining; strangury-relieving

Pyrrosia Leaf shí wéi · 石韦

Pyrrosiae Folium (Pyrrosia lingua (Thunb.) Farw. and allied species)

Nature and flavour. Sweet, bitter, slightly cold; Lung and Bladder systems.

Classically described as promoting urination and relieving strangury, cooling the blood and stopping bleeding, and clearing the Lung to calm cough. It is unusual among damp-draining herbs in reaching both the Lung and the Bladder, which is why the classical texts also record it for cough and for blood in the urine.

性味归经。甘、苦，微寒；归肺、膀胱经。

传统记载为利尿通淋、凉血止血、清肺止咳。在利水渗湿药中少见地同入肺与膀胱，故古籍亦用于咳嗽与尿血。

Classical category · no formulas, no dosages, no herb-drug combinations are given.
Safety. Slightly cold in nature; classically avoided where yin deficiency is present without damp-heat. Avoid in pregnancy and breastfeeding — reliable human safety data are lacking. Several Pyrrosia species are used under the same name, so correct botanical identification matters. Blood in the urine always warrants medical assessment; it is not a symptom to interpret with a single herb.

性微寒，传统列为阴虚而无湿热者不宜。孕期与哺乳期避免使用 —— 人体安全性数据不充分。同名入药的石韦属植物有多种，植物来源的正确鉴别很重要。尿血一律应当就医评估，不宜以单味药自行判断。

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