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Baiwei ( Blackened Swallowwort Rort)---白薇(powder100g/bottle)

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Product Description

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Baiwei is the dried root and rhizoe of Cynanchum atratum Bge.,pertaining to Asclepiadaceae. It is collected in summer and fall. After washed, it is dried and then cut into slices. The raw form is used.

[ Medicinal Properties ]: Bitter, salty and cold; relate to stomach, liver and kidney meridians.

[ Medicinal Efficacies ]: Clear heat, cool blood; promote urination, relieve stranguria; relieve toxicity and cure sores.

[ Usage and Dosage ]: 4.5-9g. Also it is used in pill or powder.

[ Precautions ]: Be cautious with loose stool due to deficiency-cold of spleen and stomach.
 
[ Clinical Applications ]: 1. Yin deficiency with internal heat, postpartum deficient fever     Baiwei treats night fever relieved in the morning due to residual pathogen in the later stage of warm disease or fever, bone-steaming, tidal fever due to yin deficiency, combined with Qinghao, Digupi and Zhimu. In case of postpartum blood deficiencyt with fever and coma, usually it is in combination with Danggui, Renshen and Gancao; for example in Baiwei Decoction. For hight fever, agitation, thirst, coma and purple tongue in warm pathogen entering nutrient level, it is combined with Shengdihuang and Xuanshen.
 
2. External contraction with yin deficiency    It treats fever, dry thorat, thirst, agitation in external contraction with yin feficiency, usually combined with Yuzhu, Dandouchi and Bohe; for exampole in Jiajian Weirui Decoction.
 
3. Heat stranguria and blood stranguria     For blood stranguria with astringent pain due to damp-heat in bladder, it is combined with Shiwei and Huashi.
 
4. Sore, abscess, swelling, toxin, swollen and sore throat and bites by poisonous snake       It is used by oral administration and external application. For sore, abscess, swelling, toxin and bites by poisonous snake, it is combined with Tianhuafen, Chishao and Gancao. In case of swollen and sore throat, it is in combinaiton with Jinyinhua, Jiegeng and Shandougen.

白薇为萝藦科植物白薇Cynanchum atratum Bge。或蔓生白薇C.versicolor Bge.的干燥根及根茎。我国南北各省均有分布。春、秋二季采挖,洗净,干燥。切段,生用。
      
【药性】苦、咸,寒。归胃、肝、肾经。       
 
【功效】清热凉血,利尿通淋,解毒疗疮。       
 
【应用】        1.阴虚发热,产后虚热。本品苦寒,善入血分,有清热凉血,益阴除热之功。若治热病后期,余邪未尽,夜热早凉,或阴虚发热,骨蒸潮热,常与地骨皮、知母、青蒿等同用;若治产后血虚发热,低热不退及昏厥等症,可与当归、人参、甘草同用,共收养血益阴、清热除蒸之效,如白薇汤(《全生指迷方》)。本品既能退虚热,又能清实热,与生地黄、玄参等清热凉血药同用,还可用治温邪入营,高热烦渴,神昏舌绛等。       
 
2.热淋,血淋。本品既能清热凉血,又能利尿通淋,故可用于膀胱湿热,血淋涩痛,常与木通、滑石及石韦等清热利尿通淋药同用。       
 
 3.疮痈肿毒,毒蛇咬伤,咽喉肿痛。本品苦咸而寒,有清热凉血,解毒疗疮,消肿散结之效,内服、外敷均可。常与天花粉、赤芍、甘草等同用,治疗血热毒盛的疮痈肿毒、毒蛇咬伤,如白薇散(《证治准绳》),也可配其他清热解毒药同用;若治咽喉红肿疼痛,常与金银花、桔梗、山豆根同用。       
 
4.阴虚外感。本品还可清泄肺热而透邪,清退虚热而益阴,故常与玉竹、豆豉、薄荷同用,治疗阴虚外感,发热咽干、口渴心烦等症,如加减葳蕤汤(《通俗伤寒论》)。       
 
【用法用量】煎服,4.5~9g。        【使用注意】脾胃虚寒、食少便溏者不宜服用。       
 
【古籍摘要】        1.《名医别录》:“疗伤中淋露,下水气,利阴气。”        2.《本草纲目》:“风温灼热多眠,及热淋、遗尿、金疮出血。”        3.《本草正义》:“凡苦寒之药多偏于燥,惟白薇则虽亦属寒而不伤阴液精血,故其主治各病,多属血分之热邪,而不及湿热诸证。……凡阴虚有热者,自汗盗汗者,久疟伤津者,病后阴液未复而余热未清者,皆为必不可少之药,而妇女血热,又为恒用之品矣。”       
 
【现代研究】        1.化学成分:本品含挥发油、强心苷等。其中强心苷中主要为甾体多糖苷,挥发油的主要成分为白薇素。       
 
 2.药理作用:本品所含白薇苷有加强心肌收缩的作用,可使心率减慢。对肺炎球菌有抑制作用,并有解热、利尿等作用。       
 
3.临床研究:据报道,白薇又可治疗其他疾病,如:用白薇、党参(或人参)、当归、炙甘草,水煎服,随证加减,治疗血管抑制性眩晕11例,治愈9例,一年未复发,有效2例;有用白薇、泽兰、银花、玄参、白芍等,水煎服,治疗红斑性肢痛27例,疼痛缓解者25例,无效2例(中药学 2001:585)       
 
4.不良反应:现代研究证明白薇有较强的强心作用,内服过量,易引起强心苷样中毒反应,中毒量为30~45g,可出现心悸、恶心、呕吐、头晕、头痛、腹泻、流涎等中毒症状,临床用药应予注意。       

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