The formula for Su Zi Descending Qi Tang contains Radix Angelicae Sinensis, Radix Polygoni Multiflori, Radix Perilla Officinalis, Radix Cinnamomum Cassiae, Radix et Rhizoma Pinelliae, Radix et Rhizoma Glycyrrhizae. Su Zi Descending Qi Tang is from “Taiping Huimin Hejie Bing Fang”. This formula has the functions of lowering qi, calming asthma, expelling phlegm and relieving cough. It is used for treating wheezing and coughing in the case of upper solid and lower deficient, which is characterized by wheezing and coughing with much phlegm, fullness in chest and diaphragm, shortness of breath, much exhalation and little inhalation, or swelling of limbs, or lumbar pain and foot weakness. In the prescription, perilla is good at lowering lung qi and eliminating phlegm; Qianhu is good at lowering qi and expelling phlegm; Hanxia is good at drying dampness and resolving phlegm (to remove phlegm in the body by drying dampness) and lowering the inverse; Houpaku is good at lowering inverse and calming asthma, and broadening the chest in addition to fullness; Angelica sinensis stops coughing and inverting the upper qi and nourishes blood and replenishes the deficiency in order to help Cinnamomum cinnamon to warm and replenish the lower element. Su Ye promotes the lungs and disperses cold; ginger and jujube harmonize the spleen and stomach; licorice harmonizes the middle and strengthens the qi, and harmonizes all the medicines (harmonizes the properties of different Chinese medicines). The combination of these herbs can lower the qi, calm the asthma, expel phlegm and relieve cough. The adverse effects and contraindications of Su Zi Xiao Qi Tang are not known. Before taking this formula, it is necessary to consult a traditional Chinese medicine practitioner for diagnosis and take it under medical supervision, do not blindly self-medicate.