泻热、治目疾、涩止痢。
苦寒。色青性涩。以其除肝热而平木。故治目疾。（洗服皆效。）惊痫风湿诸痹。以其收
涩。
故治崩带下痢。苦寒清热。是其所长。纲目谓其久服轻身。益精有子。未必然也。出西土。
皮
不脱者真。今药客俱以此皮缚北细辛。大戟为使。恶吴茱萸。（赤
眼生翳、水煮秦皮一两、澄清、日日温洗。）
即臭椿根皮。涩肠燥湿。
苦燥湿。寒胜热。涩收敛。入血分而涩血。去肺胃之陈痰。治湿热为病。泄泻久痢。崩
带肠
风。梦遗滑精。有断下之功。（一妇年四十余、耽饮无度、多食鱼蟹、积毒在脏、日夜二三
十泻、便与脓血杂下、大肠连肛门甚痛、用止血痢药、不效、用肠风药益甚、盖肠风、有血
无脓也、服热药、腹愈痛、血愈下、服冷药、注泻食减、服温平药、则若不知、年余垂毙、
或教服人参散、樗皮人参各一两、为末、空心温酒或米饮下一钱、遂愈。）去疳 。苦寒之
性。虚寒者禁之。肾家真阴虚者。亦忌以其徒燥耳。痢疾积滞未尽者。勿遽用。勉强固涩。
必变他证。叶、功用相仿。差不及尔。
椿根白皮。（即香椿根皮。）主用相仿。力稍逊之。根东引者良。去粗皮。醋炙或蜜炙。
忌猪
肉、热面。止入丸散。不入汤煎。
清热泻火，治疗眼疾，收敛止痢。
味苦性寒。颜色青，性质涩。因为它能清除肝热并平抑肝木（肝属木），所以用于治疗眼疾。（内服或外洗均有效。）惊风、癫痫以及风湿引起的各种痹证。因为它的收敛涩滞作用。
所以用于治疗崩漏、带下和痢疾。苦寒之性能清热，这是它的长处。《本草纲目》说它长期服用可以轻身、益精并能生育，这未必可信。产自西方土地。
树皮
不脱落的是真品。现在的药商都用这种皮捆绑北细辛，以大戟作为伪品冒充。畏恶吴茱萸。（赤眼生翳：水煮秦皮一两，澄清后，每日温热清洗。）
即臭椿的根皮。涩肠燥湿。
苦能燥湿，寒能胜热，涩能收敛。入血分而固涩血液。去除肺胃的陈旧痰浊。治疗湿热引起的疾病。泄泻、久痢、崩漏、带下、肠风。梦遗滑精。有止泻痢的功效。（一位四十多岁的妇女，饮酒无度，多吃鱼蟹，积毒在脏腑，日夜腹泻二三十次，大便与脓血混杂而下，大肠连肛门非常疼痛，使用止血痢的药物无效，使用治肠风的药物更加严重，大概肠风是有血无脓，服用热药腹痛加剧，出血更多，服用冷药则导致注泻且食欲减退，服用温平药则若无其事，一年多几乎濒死，有人教其服用人参散，樗根白皮与人参各一两，研为末，空腹用温酒或米汤送下一钱，于是痊愈。）去除疳积。苦寒的性质。虚寒体质者禁用。肾中真阴不足者，也需忌口，因为它过于燥烈罢了。痢疾伴有积滞尚未排尽者，不要急于使用。勉强固涩止泻，必然引发其他病证。叶子的功效相似，稍差一些而已。
椿根白皮。（即香椿的根皮。）主要功效相似，力量稍弱。根部向东生长的为佳。去掉粗皮。醋炙或蜜炙。
忌食猪肉、热面。只用于丸剂和散剂，不入汤剂煎煮。
Clears heat and purges fire, treats eye diseases, astringes to stop dysentery.
Bitter and cold in nature. Green in color and astringent in property. Because it eliminates liver heat and pacifies the Liver Wood (the Liver belongs to Wood), it is therefore used to treat eye diseases. (Effective whether taken internally or washed externally.) For fright convulsions, epilepsy, and various bi-syndromes caused by wind-dampness. Due to its astringent and consolidating properties.
Therefore, it treats metrorrhagia, leukorrhea, and dysentery. The bitter-cold nature clears heat, which is its strength. *Bencao Gangmu* states that long-term use lightens the body, benefits essence, and promotes fertility; this is not necessarily true. It originates from western regions.
The bark
that does not shed is authentic. Current drug merchants bind Northern *Asarum* (Beixixin) with this bark and use *Euphorbia* (Daji) as an adulterant. It is inimical to Evodia Fruit (Wuzhuyu). (For red eyes with corneal opacity: Decoct 1 liang of Qinpi in water, clarify, and wash daily with warm liquid.)
This is the root bark of the stink tree (*Ailanthus altissima*). It astringes the intestines and dries dampness.
Bitterness dries dampness, cold overcomes heat, and astringency consolidates. Enters the Blood level to astringe blood. Eliminates stale phlegm from the Lungs and Stomach. Treats diseases caused by damp-heat. Diarrhea, chronic dysentery, metrorrhagia, leukorrhea, intestinal wind. Nocturnal emission and seminal leakage. Possesses the function of stopping diarrhea and dysentery. (A woman over forty years old drank excessively without restraint and ate much fish and crab, accumulating toxins in the zang-fu organs. She suffered diarrhea twenty to thirty times day and night, with stool mixed with pus and blood, and severe pain in the large intestine extending to the anus. Medications for stopping bloody dysentery were ineffective; medications for intestinal wind made it worse. Generally, intestinal wind involves blood but no pus. Taking hot medicines increased abdominal pain and bleeding; taking cold medicines led to profuse diarrhea and reduced appetite; taking warm and neutral medicines had no effect. After nearly a year on the verge of death, someone advised her to take Renshen San. She took one qian of powdered Chupi Root Bark and Ginseng, taken on an empty stomach with warm wine or rice water, and was cured.) Eliminates childhood malnutrition syndrome (Gan). Due to its bitter-cold nature, it is contraindicated for deficiency-cold constitutions. Those with true yin deficiency of the Kidney must also avoid it, as it is too drying. For dysentery with residual stagnation, do not use hastily. Forcibly astringing will inevitably transform into other syndromes. The leaves have similar functions, though slightly inferior.
Chun Gen Bai Pi (Root Bark of Toon Tree). (Also known as the root bark of Xiangchun / Chinese Toon.) Main uses are similar, but potency is slightly weaker. Roots growing towards the east are superior. Remove the coarse outer bark. Process with vinegar or honey.
Contraindicated with pork and hot noodles. Only used in pills and powders, not in decoctions.