Cang Er Zi is poisonous, Cang Er Zi can be used for the treatment of nasal abyss (mainly manifested as obscene nasal mucus, the amount of wiping can not be clean), wind-cold headache, skin itching, etc.. There is no more effective statement. Cang Er Zi, mainly used for the treatment of wind-cold headache, nasal abyss, nasal congestion, toothache, limb contracture, leprosy, skin itching and so on. Clinically Cang Er Zi treatment of external wind-cold caused by cold (fear of cold) fever, head and body pain, nasal congestion and runny nose, can be used with windbreak, Angelica dahurica, Qiang Wu, Ligustrum. The dosage of Cang Er Zi should not be too large, overdose can lead to poisoning. Blood deficiency headache should not be taken. Adverse effects of Cang Er Zi: dizziness and headache, general discomfort, nausea, vomiting coffee-colored substances. If you need to use Cang Er Zi, must be used under the guidance of a professional doctor.