Lilyturf (Ophiopogon japonicus) has a long-standing use in traditional Chinese medicine (TCM) for the treatment of cough, particularly dry or spastic coughs. In TCM, Lilyturf—known as "Mai Men Dong"—is considered to nourish yin, moisten the lungs, and relieve cough. It is commonly included in herbal formulas such as "Mai Men Dong Tang" and others aimed at treating chronic coughs, dry throat, and related respiratory symptoms.

The evidence for Lilyturf's effectiveness in treating cough is primarily based on centuries of traditional use and clinical experience rather than robust modern scientific validation. Some preclinical studies have identified saponins and polysaccharides in Ophiopogon japonicus that may have anti-inflammatory and immune-modulating effects, which could theoretically benefit respiratory health. However, clinical trials specifically evaluating Lilyturf’s efficacy for spastic cough in humans are limited, and the majority of contemporary references continue to rely on traditional indications rather than high-quality randomized controlled trials.

In summary, the use of Lilyturf to support or treat spastic cough is justified by tradition and historical medical practice, with moderate but not conclusive supporting evidence from modern pharmacological research.