Synopsis

Source of validity: Traditional
Rating (out of 5): 3

Glehnia littoralis, commonly known as "Bei Sha Shen" in traditional Chinese medicine (TCM), has a long history of use for treating dry cough. This use is primarily rooted in traditional practice rather than robust modern scientific validation. In TCM, Glehnia littoralis is considered to "nourish the lung yin" and "clear heat," making it particularly suitable for addressing symptoms such as dry, irritating cough, dry throat, and hoarseness, which are interpreted as signs of "yin deficiency" with dryness. Historical TCM texts and pharmacopeias frequently include Glehnia littoralis in formulas intended for these symptoms.

Modern pharmacological studies are limited but suggest that extracts of Glehnia littoralis may have anti-inflammatory and immunomodulatory effects, which could theoretically contribute to reducing respiratory tract irritation. However, direct clinical trials investigating its efficacy for dry cough in humans are lacking, and most available evidence is preclinical or anecdotal. Therefore, the rating of 3 reflects strong traditional support but only preliminary or indirect scientific data. Its use for dry cough is well-established in TCM practice, and it is still commonly prescribed for this indication in East Asian herbal medicine.

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