Shellac generally refers to the bulb of the perennial herbaceous plant Phellodendron Bidentata, which is a product of the same origin as food and medicine, and is a general term for all shellacs. There are many kinds of shellfish, which are generally divided into Chuanbeimu, Zhebeimu, Ibeimu and Pingbeimu. And what we call Chuanbei is Chuanbeimu, which is a kind of shellfish. The nature of the cold taste bitter, can clear the lung heat phlegm, and taste sweet quality moist can moisten the lungs to stop coughing (nourish the lungs and stop coughing), especially for internal injuries and prolonged coughing, dry phlegm, hot phlegm of the evidence. From the efficacy of the drug, the effect of Chuanbei is better, and is also commonly used as the main raw material of some Chinese medicine products, such as Chuanbei loquat lozenges, Chuanbei cough syrup and so on. However, due to the cold nature of Fritillariae, it should be taken with caution for people with cold spleen and stomach (spleen and stomach weakness and cold), cold phlegm and wet phlegm. However, Pui Mu is only a kind of auxiliary herbs, usually found in dietary supplements. If you have any physical discomfort, consult a doctor as soon as possible, and do not use Bei Mu blindly to avoid delaying your condition.