Synopsis

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

Licorice (Glycyrrhiza glabra) has a long history of use in traditional medicine systems, such as Traditional Chinese Medicine (TCM) and Ayurveda, for the treatment of cough and other respiratory ailments. In TCM, licorice is considered a "harmonizing" herb and is frequently included in herbal formulas to soothe the throat and reduce coughing. The root is thought to have demulcent (soothing) and expectorant properties, helping to coat irritated mucous membranes and promote the expulsion of mucus.

There is some scientific evidence that supports its traditional use. Licorice contains glycyrrhizin, which has demonstrated anti-inflammatory, antiviral, and antimicrobial effects in laboratory studies. Some clinical and preclinical studies suggest that licorice extracts can reduce cough frequency and soothe sore throats, likely due to these properties. However, most studies are limited in size and quality, and definitive clinical evidence is lacking. Systematic reviews generally conclude that while licorice may offer mild relief for cough, more rigorous trials are needed.

Despite the lack of robust modern clinical evidence, the traditional use of licorice for cough is well documented. Caution is advised, particularly with long-term or high-dose use, as glycyrrhizin can cause significant side effects, including hypertension and electrolyte disturbances.

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