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Baiqian ( Willowleaf wallowwort Rhizome/Cynanchi Stauntonii)---白前(powder100g/botter)

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It is the rhizome and root of Cynanchum stauntonii(Decne.) Schltr.ex Levl. or Cynanchum glaucescens (Decne.) Hand.-Mazz.,family Asclepiadaceae. They are dug and collected in autumn. They are washed clean and then dried in the sunshine and cut into segments. The raw or stir-blaed with honey are used.

[ Medicinal Properties ]: Pungent, bitter and slightly warm; relate to lung meridian.

[ Medicinal Efficacies ]: Direct qi downward and resolve phlegm.

[ Clinical Applications ]: Cough with profuse sputum, fullness in chest , dyspnea      It treats stagnation of lung qi causing cough with profuse sputum on cold side, in combination with Ziwan and Banxia. For that on heat side, it is used together with Sangbaipi and Digupi. To treat cough due to exogenous wind and cold, it is usually used with Jingjie, Jiegeng and Chenpi, such as Zhike Powder. For excess syndrome manifested as cough and dyspnea with edema and sputum rumbling in throat, it is combined with Ziwan and Daji in Baiqian Decoction.

[ Usage and Dosage ]: 3-9g.

白前为萝藦科植物柳叶白前Cynanchum stauntonii (Decne.) Schltr.ex Levl. 或芫花叶白前C.glaucescens (Decne.)Hand.-Mazz.的根茎及根。主产于浙江、安徽、江苏、福建、湖北、江西、湖南等地。秋季采挖,洗净,晒干生用或蜜炙用。

       【药性】辛、苦,微温。归肺经。        【功效】降气化痰。       
 
【应用】        咳嗽痰多,气喘。本品性微温而不燥烈,长于祛痰,降肺气以平咳喘。无论属寒属热,外感内伤,新嗽久咳均可用之,尤以痰湿或寒痰阻肺,肺气失降者为宜。治外感风寒咳嗽,咯痰不爽者,配荆芥、桔梗等宣肺解表之品,如止嗽散(《医学心悟》);若咳喘浮肿,喉中痰鸣,不能平卧,则配紫菀、半夏、大戟等以逐饮平喘,如白前汤(《深师方》);配清泻肺热之桑白皮、葶苈子等同用,可治内伤肺热咳喘,如白前丸(《圣济总录》);若与益气润肺之黄芪、沙参等配伍,可治疗久咳肺气阴两虚者。       
 
【用法用量】煎服,3~1Og;或入丸、散。       
 
【古籍摘要】        1.《名医别录》:“主治胸胁逆气,咳嗽上气。”       
 
2.《本草纲目》:“手太阴药也。长于降气,肺气壅实而有痰者宜之。”       
 
 3.《本草汇言》:“白前泄肺气,定喘嗽之药也,疗喉间喘呼,为治咳之首剂;宽膈之满闷,为降气之上品。前人又主奔豚及肾气,然则性味功力,三因并施,脏腑咸入,腠里皮毛,靡不前至,盖以功力为名也。”       
 
【现代研究】        1.化学成分:柳叶白前根茎中含β-谷甾醇、高级脂肪酸及华北白前醇。芫花叶白前根中含有白前皂苷A~K,白前皂苷元A、B、白前新皂苷A、B及白前二糖。      
 
  2.药理作用:芫花叶白前各种提取物均有明显的镇咳作用,水、醇提取物又具有明显的祛痰作用。水提取物对乙酰胆碱和组胺混合液诱发的豚鼠哮喘有明显的预防作用。
 
此外,水提取物还具有非常显著的抗炎作用。柳叶白前醇、醚提物有较明显的镇咳作用和祛痰作用,水提物有一定的祛痰作用和抗炎作用,还具有镇痛及抗血栓形成作用。       

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