Pharmaceutical name: 英文藥名﹕	Radix or Rhizoma Cynanchi Stauntonii
Botanical name: 學名﹕	Cynanchum stauntonii (Decne.) Schltr.ex Levl. (柳葉白前) Gynanchum glaucescens (Decne.) Hand. Mazz (芫花葉白前)
Pron. in Japanese: 日語發音﹕	byakuzen
Pron. in Korean: 韓語發音﹕	paekchon
Pron. in Cantonese: 粵音﹕
Other Names: 別名﹕	shi lan 石蓝﹐ shou yao 嗽藥 Cynanchum stauntonii also called shui yang liu 水楊 柳 ﹐ da he piao 大鶴 瓢﹐ shui liu 水柳。 Gynanchum glaucescens also called xi piao geng 溪瓢羹﹐ xiao jie cao 消結 草﹐ wu geng zi 烏 梗仔。 Names in herb trade: Cynanchum stauntonii also called nan bai qian 南白前﹐ kong bai qian 空白前﹐ e bai qian 鹅白前﹐ e guan bai qian 鹅管白前。   柳葉 白前，又名：水楊 柳 ﹐ 大鶴 瓢﹐ 水柳。芫花葉 白前，又名：溪瓢羹﹐ 消結 草﹐ 烏 梗仔。 藥 材 名 稱 ﹕ ：柳葉 白前，又名南白前﹐ 空白前﹐ 鹅白前﹐ 鹅管白前。
Common Name: 英文名﹕	root and rhizome of cynanchum
Distribution: 產地﹕	mainly in Zhejiang, Jiangsu, Anhui provinces, and also produced in Hubei, Jiangxi, Fujian provices. 分布中國浙江﹐ 江蘇﹐ 安徽等地，湖北﹐ 江西﹐ 福建等地亦產。
Properties (characteristics)﹕ 性味﹕	acrid, sweet, neutral. 味辛﹐ 甘﹐ 性平。
Channels (meridians) entered:   歸經﹕	lung 肺
Medical functions: 藥理﹕
Actions & Indications: 主治﹕	cough due to influenza, bronchitis, asthma with abundance of phlegm. Usually bai qian is being used together with zi wan, ban xia. It can be used in cold type and hot type of cough. 感冒咳嗽﹐  支氣 管炎﹐ 喘咳痰多。，常配紫菀﹐ 半夏。可 用 於寒嗽，或 熱嗽。
Chemical ingredients: 化學成份﹕	bai qian contains Triterpenoid sapogenins, among them: 白前中含三萜皂苷﹐  其 中 ﹕ glaucoide A,  B, C, D, E, F, G, H, I, J, 白前皂苷，甲 ﹐ 乙，丙，丁，戊，已，庚，辛，壬，癸 hamcockinol 華北白前醇 β-sitosterol β-穀甾醇 Also contains: 另 有 ﹕ fatty acids with 24-30 carbon units C24-C30 脂肪酸
Dosage: 用量﹕	5～10g。 5 ~ 10 克 。
Samples of formulae :處方舉例﹕
Modern Research: 現代研究﹕
Toxicity & Cautions: 毒素與禁忌﹕	According to the classics "Ben Cao Jing Su" : do not use in cough due to qixu (qi deficient) and not due to infection. 《本草經疏》：「凡咳逆上氣，咳嗽氣逆，由於氣虛，氣不歸元，而不由於肺氣因邪客壅實者，禁用。」