Onion root and whiskers should be scallion whiskers, the effect of its boiling water is to dispel wind, dispersing cold, and also able to detoxify; for typhoid fever (feeling cold caused by fever disease) headache, frostbite and so on have a role. As a kind of Chinese medicine with food and medicine, the efficacy of its boiled water is relatively weak, if the condition requires, you should ask the physician to identify the use of other medicines with other drugs. Scallion beard flavor pungent, sexual flat, into the lung meridian, have the effect of expelling wind, dispersal of cold, and also has the effect of detoxification; in the use of scallion beard boiled water on frostbite has an improved effect, but also can treat wind-cold headache and other diseases. Adverse effects of onion root beard are not clear for the time being, and the contraindications are not yet clear. It should be noted that people with eczema and measles should not use it. If you need to use onion root beard, it should be used under the guidance of a professional Chinese medicine practitioner.