泻心胃热毒。
苦咸大寒。解心胃热毒。治伤寒时疾热狂。阳毒发斑。（热甚伤血、里实表虚则发斑、
紫黑
者、热极而胃烂也、多死、活人书、治赤斑烦痛、有犀角大青汤。）黄胆热痢。丹毒喉痹
。非心胃热毒勿用。处处有之。高二三尺。茎圆叶长。叶对节生。八月开小红花。成簇。实
大
泻肝、散郁火。
咸寒。色青泻肝。散五脏郁火。解中下焦蓄蕴风热。（衍义曰∶一妇患脐腹二阴遍生湿
疮、
热痒而痛、出黄汁、二便涩、用鳗鲡、松脂、黄丹之类涂之、热痛愈甚、其妇嗜酒、喜食鱼
虾发风之物、乃用马齿苋四两、研烂、青黛一两、和涂、热痛皆去、仍服八正散而愈、此中
下焦蓄蕴风热、毒瓦斯若不出、当病肠风内痔、妇不能禁酒物、果发痔。）治伤寒发斑。血痢
咯血。（合杏仁研、置柿饼中煨食、名圣饼子、治咯血。）小儿惊痫疳热。丹热。敷痈疮蛇犬
毒。性凉。中寒者勿使。即阴虚而有热者。亦不宜用。真者从波斯国来。不可得也。今用干
靛
两。亦佳。（内多锻石、故须淘净。）
泻热止呕。
甘和胃，寒降火。治呕哕反胃。（胃热火升则呕、逆食不下。）客热消渴。伤寒烦热。止
小便
数。（肺为水之上源、脾气散精、上归于肺、始能通调水道、下输膀胱、肾为水脏、而主二
便、三经有热、则小便数甚、至不能少忍、火性急速故也、芦中空、清上焦、湿热解、则肺
之气化行、而小便复其常道矣。）芦笋能解鱼、蟹、河豚毒。反胃呕吐。由于寒者勿用。取
逆水肥浓者。去须节。（因热霍乱烦闷、芦根三钱、麦门冬二钱、水煎服、即愈。）
泻除心经和胃经的热毒。
味道苦、咸，性质大寒。能解除心经和胃经的热毒。治疗伤寒及时行疫病引起的热盛发狂。治疗阳毒引起的发斑。（热邪极盛损伤血分，里实而表虚则出现发斑，斑色紫黑表示热极导致胃黏膜腐烂，多致死，《活人书》记载治疗赤斑伴烦痛，可用犀角大青汤。）治疗黄疸、热痢。治疗丹毒、喉痹。如果不是心胃热毒证，不要使用。这种植物各地都有。高二三尺。茎圆形，叶片长。叶子在节上对生。八月开小红花，成簇生长。果实大。
泻肝火，疏散郁结之火。
味道咸，性质寒。颜色青入肝经以泻肝火。疏散五脏郁结之火。解除中焦和下焦蓄积蕴藏的风热。（《衍义》记载：一位妇女患脐腹及二阴部位遍生湿疮，热痒且疼痛，流出黄色汁液，大小便涩滞。用鳗鲡、松脂、黄丹等药物涂抹，热痛反而加剧。该妇女嗜酒，喜欢吃鱼虾等发风之物。于是用马齿苋四两，研烂，加入青黛一两，调和后外涂，热痛皆去，再内服八正散而痊愈。这是中下焦蓄积蕴藏的风热，毒气如果不排出，会导致肠风和内痔。该妇女不能节制饮酒和食用发物，果然引发了痔疮。）治疗伤寒发斑。治疗血痢、咯血。（与杏仁研细，放入柿饼中煨熟食用，名为圣饼子，治疗咯血。）治疗小儿惊痫、疳积发热。治疗丹热。外敷痈疮、蛇咬及犬咬之毒。药性凉。中寒者勿用。即使是阴虚而有热者，也不宜使用。真正的青黛来自波斯国，现已难得。现在使用的干靛蓝粉也可以。（内多含有锻石，所以必须淘洗干净。）
泻热止呕。
味道甘，能和胃；性质寒，能降火。治疗呕吐、呃逆、反胃。（胃中有热，火气上逆则呕吐，饮食难下。）治疗客热引起的消渴。治疗伤寒引起的烦热。减少小便次数。（肺为水之上源，脾气散布精微，上归于肺，才能通调水道，向下输送到膀胱。肾为水脏，主管二便。如果这三经有热，则小便频数严重，甚至无法忍耐，因为火性急速的缘故。芦根中空，能清上焦湿热，湿热解除，则肺的气化功能运行正常，小便恢复常态。）芦笋能解鱼、蟹、河豚之毒。治疗反胃呕吐。由于寒证引起的呕吐勿用。取逆流生长、肥厚浓绿的芦根。去掉须和节。（因热霍乱烦闷，用芦根三钱、麦门冬二钱，水煎服，即可痊愈。）
Clears heat and toxicity from the Heart and Stomach.
Bitter, salty, and extremely cold in nature. Resolves heat toxicity of the Heart and Stomach. Treats heat-induced mania in Shanghan (Cold Damage) and epidemic febrile diseases. Treats macules caused by Yang toxicity. (When heat severely damages blood, with excess internally and deficiency externally, macules appear; purple-black macules indicate extreme heat causing gastric tissue necrosis, often fatal. The *Huoren Shu* records treating red macules with irritability and pain using Xijiao Daqing Tang.) Treats jaundice and hot dysentery. Treats erysipelas and sore throat. Do not use unless there is heat toxicity in the Heart and Stomach. It grows everywhere. Two to three chi high. Round stems, long leaves. Leaves grow opposite at nodes. Small red flowers bloom in clusters in August. Large fruits.
Drains Liver fire, disperses stagnant fire.
Salty and cold in nature. Its green color enters the Liver to drain Liver fire. Disperses stagnant fire in the Five Zang organs. Resolves wind-heat accumulated and harbored in the Middle and Lower Jiao. (*Yanyi* records: A woman suffered from damp sores all over her umbilical region, abdomen, and genitalia, with heat, itching, pain, yellow discharge, and difficult urination and defecation. She applied eel, pine resin, and lead oxide, which worsened the heat and pain. As she loved alcohol and fish/shrimp (wind-inducing foods), she used four liang of Portulaca oleracea, mashed, mixed with one liang of Qingdai, applied topically. Heat and pain ceased. She then took Bazheng San and recovered. This was wind-heat harbored in the Middle and Lower Jiao; if toxins were not expelled, it would lead to intestinal wind and internal hemorrhoids. Unable to abstain from alcohol and triggering foods, she indeed developed hemorrhoids.) Treats macules in Shanghan. Treats bloody dysentery and hemoptysis. (Grind with Almond seeds, place inside a persimmon cake, bake and eat; named Shengbingzi, treats hemoptysis.) Treats pediatric convulsions, epilepsy, and malnutrition fever. Treats erysipelas heat. Topical application for carbuncles, snakebites, and dog bites. Nature is cool. Contraindicated for those with Middle Jiao cold. Even those with Yin deficiency and heat should avoid it. Genuine Qingdai comes from Persia and is now unavailable. Dried indigo powder currently used is also good. (Contains much calcined stone, so must be washed clean.)
Clears heat and stops vomiting.
Sweet and harmonizing to the Stomach; cold and descending in action. Treats vomiting, hiccups, and regurgitation. (Stomach heat rising causes vomiting and inability to keep food down.) Treats exogenous heat causing thirst (Xiaoke). Treats irritability and heat in Shanghan. Reduces frequent urination. (The Lung is the upper source of water; the Spleen scatters essence upward to the Lung, enabling regulation of water passages and downward transport to the Bladder. The Kidney is the water organ, governing urination and defecation. Heat in these three meridians causes severe urinary frequency, unbearable due to the rapid nature of fire. Lu Gen is hollow, clears Upper Jiao damp-heat; once damp-heat resolves, Lung Qi transformation functions normally, and urination returns to its regular course.) Lu Sun can detoxify fish, crab, and pufferfish poison. Treats regurgitation and vomiting. Contraindicated for vomiting due to Cold. Select thick, green stalks growing against the current. Remove roots and joints. (For heat-induced cholera with irritability, decoct three qian of Lu Gen and two qian of Ophiopogonis Radix [Mendong] in water; cure follows.)