Szechuan Bei, generally refers to Szechuan Bei Mu. There is no such thing as how old a child can take Chuanbeimu. There is no clear information to standardize how old a child can take this medicine. Generally, as long as its indications are met, you can take Chuan Bei Mu as prescribed by your doctor. Chuan Beimu has the efficacy of clearing heat and moistening the lungs (removing heat to nourish the lungs), resolving phlegm and relieving cough, dispersing knots and eliminating carbuncles (evacuating knots and eliminating carbuncles). It is cold and slightly bitter in nature, and can clear the lungs, drain heat and resolve phlegm, and sweet and moist to moisten the lungs and relieve cough, especially for internal injuries and prolonged cough, dry phlegm, hot phlegm. It is used for coughs caused by lung deficiency, and coughs caused by yin deficiency, often combined with Radix Panax Ginseng and Ophiopogon to nourish yin and moisten the lungs (by replenishing the lung fluid to moisturize the lungs), to resolve phlegm and relieve cough; and it is often combined with Rhizoma Ziziphi to remove heat from the lungs and moisten the dryness of lungs, to resolve phlegm and relieve cough. Chuanbei Mu can clear away heat, resolve phlegm, dissolve phlegm and dissipate knots. To treat scrofula (mainly cervical lymph node tuberculosis) with phlegm-fire stagnation, it is used with Xuan Shen and oyster to dissolve phlegm and soften scrofula; and to treat sores and carbuncles caused by heat and toxicity, it is often used with dandelion and fritillaries to remove heat and toxicity from the body and to dissolve swellings and knots. This drug should not be used with Chuanwu, Chuanwu, Caowu, Gewu, and Pianzi. It should not be used indiscriminately. If a child needs to use this medicine, he/she must be instructed by a professional Chinese medicine practitioner.