Synopsis

Source of validity: Traditional
Rating (out of 5): 2

Pyrrosia, particularly Pyrrosia lingua (commonly known as "Shi Wei" in traditional Chinese medicine, TCM), has a long history of use in traditional medicine systems, especially in East Asia. In TCM, Pyrrosia is known for its ability to "clear heat," "promote urination," and "relieve cough and expel phlegm." It is frequently included in herbal formulas aimed at treating coughs, especially those categorized as "spastic" or dry coughs, often associated with heat or dryness in the lungs. The TCM literature describes its use for symptoms such as dry throat, persistent cough, and sometimes blood-streaked sputum. Some classical compendia and modern TCM pharmacopeias note its application for respiratory complaints, although it is more commonly recognized for its urinary tract benefits.

There is limited scientific validation for these traditional uses. Modern pharmacological studies on Pyrrosia have primarily focused on its anti-inflammatory, antioxidant, and diuretic effects, with only sparse and preliminary research into its antitussive (cough-suppressing) properties. As of now, the bulk of evidence supporting Pyrrosia’s use for cough (spastic) is rooted in traditional practice rather than rigorous clinical trials or biomedical research. Thus, the justification for using Pyrrosia to support or treat spastic cough remains primarily traditional, and the scientific evidence is limited to a few laboratory studies that do not directly confirm clinical efficacy for this specific indication.

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