Qingzao Jiufei Decoction comes from "The Law of Medicine" written by Yu Jiayan, a medical expert in the Qing Dynasty.

Qingzao Jiufei Decoction and Baihe Gujin Decoction both have the effect of nourishing yin and moisturizing dryness, and both treat dry cough with less phlegm. However, Qingzao Jiufei Decoction is mainly used to treat dry cough. The pathogenesis of dry cough is caused by exogenous warm-dryness. The main symptoms are dry cough with less phlegm, headache, body heat, dry throat, upset and thirst. The prescription uses cold and cooling products of mulberry leaves and gypsum. , gently relieve lung dryness and mainly clear away lung heat.

It is combined with donkey-hide gelatin, Ophiopogon japonicus, and flaxseed to nourish lung yin, and then uses ginseng and licorice to nourish lung qi, almonds, and loquat leaves to reduce phlegm and relieve cough. Xuan Qing Moist agent; the pathogenesis of dry cough mainly treated by Baihe Gujin Decoction is caused by yin deficiency in the lungs and kidneys, and internal dryness cough due to deficiency fire. Symptoms include dry cough with less phlegm, heat in the palms and soles, night sweats, and dry throat. , more phlegm with blood, red tongue with less coating, thin and rapid pulse, etc.

The prescription uses lily, raw rehmannia root, and cooked rehmannia root to moisten the lungs and kidneys, and nourish gold and water; Ophiopogon japonicus and scrophulariaceae nourish yin and strengthen water to clear away heat; Angelica sinensis and white peony root nourish and harmonize blood; Fritillaria clears away heat and moistens the lungs. , resolve phlegm and relieve cough; platycodon and raw licorice soothe the lungs and soothe the throat. All medicines are used together, mixed into gold and water, and the medicine takes into account both the symptoms and the symptoms.

"The Law of Medicine" is a comprehensive medical book written by Yu Chang, a medical expert in the late Ming Dynasty and early Qing Dynasty. It was written in the 15th year of Shunzhi in the Qing Dynasty (1658).

Yu Chang, whose courtesy name was Jiayan and also known as Xichang Old Man, was a native of Xinjian, Jiangxi (now Nanchang, Jiangxi). He was born in the thirteenth year of Wanli in the Ming Dynasty (1585 AD) and died in the third year of Kangxi in the Qing Dynasty (1664 AD), at the age of seventy-nine. Yu Chang studied as a young man to manage his son's career. During the Chongzhen period, selected tribute students were sent to Beijing, but nothing was accomplished.

Later he turned to Zen and went out to practice medicine. Traveled to and from Nanchang, Jing'an and other places. In the early Qing Dynasty (AD 1644-1661), Yu moved to Changshu, Jiangsu Province. He had an outstanding medical reputation and became the most famous physician in the late Ming and early Qing Dynasties. He was as famous as Zhang Luyu and Wu Qian and was known as the three great doctors in the early Qing Dynasty. He is the author of "Yuyi Cao", "Shang Lun Chapter", "Shang Lun Chapter 2", "Medical Law", etc.

This book combines clinical disease and syndrome, expounds the principles of syndrome differentiation and treatment, and clearly points out the mistakes that doctors often make in syndrome differentiation and treatment. The book has six volumes, the first volume is the basic theory, and the second to fourth volumes are exogenous diseases. , Volume 5 and Volume 6 are miscellaneous internal diseases. This book provides a detailed discussion of TCM diagnostic methods such as inspection, hearing, inquiry, and pain based on the "Inner Canon", "Treatise on Febrile Diseases", and "Synopsis of the Golden Chamber".

This book has clinical reference, guidance and practical value. It is a traditional Chinese medicine monograph that combines theory and practice.