You can soak the aster and then make a decoction and take the resulting solution. Aster is the dried root and rhizome of Asteraceae. It is pungent, bitter and warm in nature. It belongs to the lung meridian. It has the effect of moistening the lungs and lowering the qi (moisturizing the lungs and making the upwardly charged lung qi descend), eliminating phlegm and relieving cough. It is used for coughing with much phlegm, coughing for a long time, coughing up blood through labor. Aster with Thornybush is used to eliminate wind and expel wind, as well as dissolve phlegm and relieve cough. It is suitable for those who have wind-cold and cough with asthma. Aster with Momordica charantia can enhance the power of moistening the lungs and relieving cough. Suitable for all kinds of cough without phlegm or with phlegm. Be cautious in taking Aster for those with dry cough due to Yin deficiency. Soak the medicine in cool water for 30-60 minutes before decocting Aster, then bring to a boil over high heat, then decoct over low heat for about 20-30 minutes before taking. Medical supervision is required for taking it.