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Yifei Capsules is a traditional Chinese medicine (TCM) product manufactured and marketed by Sichuan Defeit Pharmaceutical. As indicated by its name—where "Yifei" translates to "benefiting the lungs"—the formulation is designed for respiratory and lung support. In the context of TCM theory, such preparations are typically used to nourish lung Qi and Yin, moisten the lungs, and alleviate symptoms associated with chronic respiratory conditions, such as chronic cough, shortness of breath, and phlegm production. It is commercially available in China and is positioned for the treatment of conditions like chronic bronchitis and pulmonary deficiency.
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