Synopsis

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

Dioscorea nipponica, commonly known as Japanese yam or "Nippon wild yam," has a longstanding history of use in traditional Chinese medicine (TCM) and Japanese Kampo medicine. It is primarily used for its anti-inflammatory, analgesic, and antispasmodic properties, particularly in disorders such as rheumatism, arthritis, and various inflammatory conditions. In traditional medical texts, Dioscorea nipponica is sometimes used to address respiratory ailments, including coughs—especially those described as "spastic" or involving bronchial spasm—because of its reputed ability to "relax the bronchi" and "dispel wind" in the context of TCM theory.

There is limited scientific research specifically validating its use for cough (spastic) in modern clinical studies. Most available research focuses on its saponin content (notably dioscin), which has demonstrated anti-inflammatory and antitussive (cough-suppressing) effects in animal models. However, these studies are not extensive and do not specifically address spastic cough in human populations. As such, current use for cough is primarily justified by traditional practice rather than robust scientific evidence. The evidence rating reflects the presence of traditional use and some preclinical support, but a lack of solid clinical trials or systematic reviews for this indication.

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