Synopsis

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

Sweet flag (Acorus calamus) has been used traditionally in various systems of medicine, including Ayurveda and traditional Chinese medicine, for the treatment of cough and other respiratory ailments. Historical texts describe its use as an expectorant, believed to help clear mucus from the airways and ease breathing. Ayurvedic formulations often include sweet flag rhizome to manage symptoms of cough, cold, and bronchitis. The plant contains several volatile oils and compounds such as β-asarone, which are thought to contribute to its medicinal properties.

However, modern scientific validation for its use in treating cough is limited. While some in vitro and animal studies indicate antimicrobial and anti-inflammatory activities of sweet flag extracts, there is a lack of robust clinical trials specifically evaluating its efficacy against cough in humans. Additionally, safety concerns exist due to the presence of β-asarone, which has shown possible carcinogenicity in animal studies, leading to regulatory restrictions in some countries.

In summary, the use of sweet flag for cough is supported primarily by traditional use and anecdotal evidence, with limited scientific research to corroborate its effectiveness or safety for this indication. Caution is advised when using sweet flag, particularly over extended periods or in high doses.

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