Synopsis

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

Citrus spp., which includes species such as Citrus limon (lemon), Citrus sinensis (sweet orange), and Citrus aurantium (bitter orange), has a long history of use in traditional medicine systems for the management of cough, including spastic (or spasmodic) coughs. In traditional Chinese medicine, citrus peels (such as Chen Pi, dried tangerine peel) are commonly used in herbal formulas to address phlegm and cough. Likewise, in Ayurveda and various folk medicine systems, citrus fruits and their peels are employed as remedies for coughs, colds, and respiratory discomfort, often in the form of decoctions, syrups, or teas. The rationale is largely based on the expectorant, anti-inflammatory, and soothing properties attributed to citrus essential oils and flavonoids. However, while such uses are well-documented in ethnomedical literature, scientific validation of these effects is limited. Some in vitro and animal studies suggest mild antitussive and bronchodilatory effects, but robust clinical trials in humans are lacking, and the evidence remains anecdotal or preclinical. Therefore, the use of Citrus spp. for spastic cough is primarily justified by traditional use rather than strong scientific evidence.

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