Synopsis

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

Aerva lanata, commonly known as "mountain knotgrass," has been traditionally used in various systems of medicine, particularly in Ayurveda and folk medicine in India, for the treatment of cough and other respiratory ailments. Historical texts and ethnobotanical surveys document its use as an expectorant and in remedies for coughs, including spastic (dry, irritating) coughs. The plant is often employed in decoctions or infusions, sometimes in combination with other herbs, to help soothe the throat and reduce cough reflex. However, scientific validation for these uses is limited. While some phytochemical studies have identified the presence of flavonoids, alkaloids, and saponins in Aerva lanata—compounds that are sometimes associated with antitussive (cough-suppressing) effects—there is a lack of direct clinical or robust preclinical studies specifically examining its efficacy in treating cough, let alone spastic cough. The traditional rating reflects the reliance on long-standing ethnomedical practice rather than controlled scientific evaluation. In summary, while traditional evidence supports the use of Aerva lanata for cough, more rigorous pharmacological and clinical research would be needed to confirm its effectiveness and safety for this indication.

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