Synopsis

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

Boerhavia diffusa (commonly known as Punarnava) has a long history of use in traditional medicine systems, particularly Ayurveda, for the treatment of cough and respiratory ailments. Classical Ayurvedic texts describe the use of Boerhavia diffusa as an expectorant and for alleviating symptoms associated with cough, bronchitis, and asthma. The traditional rationale stems from its reputed anti-inflammatory, demulcent, and expectorant properties. However, direct scientific evidence supporting its efficacy specifically for treating cough is limited.

Some preclinical studies have reported that Boerhavia diffusa exhibits anti-inflammatory and immunomodulatory effects, which could theoretically contribute to cough relief. There are also a few animal studies indicating potential antitussive (cough-suppressing) activity, but these findings are preliminary and not robustly replicated in human clinical trials. Most of the scientific literature focuses on its use for kidney and liver disorders rather than respiratory conditions.

In summary, the use of Boerhavia diffusa for cough is primarily justified by its traditional use in Ayurveda and other traditional medicine systems. The scientific evidence base supporting this indication is weak and largely indirect, with a lack of rigorous clinical trials evaluating its effectiveness for cough in humans.

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