雷斧雷楔。皆霹雳击物。精气所化。是物生土中。无苗叶。而杀虫逐邪。犹雷之丸也
。竹之余气所结。故又名竹苓。（濒湖）大小如栗。状类猪苓而圆。皮黑肉白。甚坚实。（又）
赤者杀人。白者善。（贞白）
气味甘。微苦。微寒。有小毒。主行胃热。除皮中热结。逐风逐毒。解蛊杀虫。治癫痫
狂走。利丈夫。不利女子。（非利益之利。乃疏利男子元气。不疏利女子脏气。故久服阴痿
也。）久服阴痿。作摩积之膏。能疗小儿百病。下寸白虫。治应声虫。小儿出汗有热。雷丸
四两。粉半斤。为末。扑之。下寸白虫。雷丸水浸。去皮。切。焙为末。五更初。食炙肉少
许。以稀粥饮服一钱匕。须上半月服。虫乃下。
〔论〕雷丸为竹之余气所结。夫竹引根于秋深。孕笋于冬半。是禀清寒以生。合于金水
之阴以在下者。兹味本清阴之气味。而又能疏利。取以行气血之热。岂非良剂。第通用不无
有伤元气耳。
〔辨治〕切忌赤色者。入药炮用。
入药烧沥。惟用淡竹一品。其肉薄。节间有粉。（颂）淡竹今呼水竹。有大小二种。
汁多而甘。存中言苦竹之外皆淡竹误。（濒湖）一种草类。茎如铁线。叶似嫩稷。长尺余。
亦名淡竹叶。俗多采利小水。治喉痹等证。神效。却与此殊。（嘉谟。）
气味辛平甘寒。可升可降。阳中阴也。入足阳明手少阴经。主治热狂烦闷。壮热头痛头
风。并胸中痰热。咳逆上气。更除虚烦。清心益气。散吐血热毒。疗消渴。利小水。通淋闭。
叶
味苦寒。所以能清心热。凉肺清心。祛暑解毒。治小儿烦热。壮男子胃气。（能）竹叶
阴中微阳。辛平除热缓脾而益元气。（洁古东垣）除新久风邪之烦热。止喘促气胜之上冲。（东
垣）煎汤。调熟枣仁末五钱。临卧服。治心虚不得眠。同麦冬枣仁远志丹参茯神丹砂犀角。
治心经蕴热。虚烦不眠。入白虎汤。治伤寒烦热。大渴引饮。时行发黄。竹叶五升。小麦七
升。石膏三两。水斗半。煮七升服。尽剂愈。按热狂烦闷。与虚烦不同。如入白虎治伤寒烦
热大渴引饮。是热狂烦闷之类也。如竹叶汤止用竹叶麦冬甘麦姜枣。虚悸加参。少气力加糯。
以治产后短气烦闷。是虚烦之类也。虚烦又有气血之异。如加味竹叶汤。以阿地易知膏。治
妊娠伤寒汗下后热不除者。是虚在血分也。如竹叶归 汤。参 术并用。止取竹叶麦冬以清
产后虚热。口干作渴。恶冷冻饮料食者。是虚在气分也。绎此即知消渴之用。及壮热头风吐血热
毒风之用。皆由阳中无阴而阳僭。所谓益元气者。阳中有阴耳。
Lei Fu (Thunder Axe) and Lei Xi (Thunder Wedge) are both formed by lightning striking objects. They are transformed from the essence and qi of thunder. These substances grow in the soil, without stems or leaves, and can kill parasites and expel pathogenic factors, similar to Lei Wan (Polyporus Umbellatus). It is結 (condensed) from the residual qi of bamboo, hence also known as Zhu Ling (Bamboo Poria). (Li Shizhen) It is as large as a chestnut, rounder than Zhu Ling, with black skin and white flesh, very solid. (Ibid.) The red variety is lethal, while the white one is effective. (Tao Hongjing)
The flavor is sweet, slightly bitter; the nature is slightly cold, with slight toxicity. It primarily clears stomach heat, removes heat accumulation in the skin, expels wind and toxins, resolves gu poison, kills parasites, and treats epilepsy and manic running. It benefits men but is unfavorable for women. (Here "unfavorable" does not mean lack of benefit, but rather that it disperses and promotes the yuan qi of men, but does not disperse and promote the zang qi of women; thus, long-term use leads to impotence.) Long-term use causes impotence. When made into a paste for grinding accumulations, it can treat various diseases in children. To expel Taenia solium (Taenia), treat Ying Sheng Chong (Echoing Worm): For children with sweating and fever, take 4 liang of Lei Wan and half a jin of rice flour, grind into powder, and apply externally to the body. To ingest for expelling worms: Soak Lei Wan in water, remove the peel, slice, bake, and grind into powder. At dawn (wugeng time), eat a small amount of roasted meat first, then swallow one qianbi dose with thin porridge. It must be taken during the first half of the lunar month for the worms to be expelled.
[Discussion] Lei Wan is condensed from the residual qi of bamboo. Bamboo takes root deep in autumn and nurtures shoots in winter; thus, it is born from clear-cold qi, conforming to the yin of Metal and Water located below. This substance possesses a clear-yin flavor and nature, and can also disperse and promote flow. Using it to circulate and clear heat in qi and blood—is it not an excellent remedy? However, general use may inadvertently damage yuan qi.
[Differentiation and Treatment] Strictly avoid using the red variety for medicinal purposes; it must be processed before use.
When burning to extract juice for medicine, only Dan Zhu (Light Green Bamboo) is used. Its flesh is thin, and there is powder between the nodes. (Su Song) Dan Zhu is now called Shui Zhu (Water Bamboo), with two types: large and small. It has abundant, sweet juice. Chen Cunren stated that all bamboos except Ku Zhu (Bitter Bamboo) are Dan Zhu, which is incorrect. (Li Shizhen) There is another herbaceous plant with stems like iron wires and leaves resembling young millet, over a chi long, also named Dan Zhu Ye (Lophatheri Herba). Folk commonly harvest it to promote urination and treat throat bi (sore throat/swelling) with miraculous effect. This is quite different from Lei Wan. (Jia Mo)
The flavor is pungent, neutral, sweet, and cold; its action can ascend and descend, belonging to yang within yin. It enters the Foot Yangming and Hand Shaoyin meridians. It mainly treats mania, restlessness, high fever, headache, cephalalgia due to wind, phlegm-heat in the chest, cough with rebellious qi. It further eliminates deficiency vexation, clears the heart and supplements qi, dissipates heat-toxin from hematemesis, treats xiao ke (wasting-thirst), promotes urination, and treats lin syndrome (dysuria).
Dan Zhu Ye (Lophatheri Folium) has a bitter and cold flavor, so it can clear heart heat, cool the lungs and heart, dispel summerheat and detoxify, treat childhood vexation-heat, and strengthen the stomach qi of men. (Zhang Yuansu) Dan Zhu Ye belongs to yin containing slight yang; its pungent and neutral nature removes heat, soothes the spleen, and supplements yuan qi. (Zhang Yuansu, Li Dongyuan) It removes vexation-heat caused by new or old wind pathogens and stops wheezing and rebellious qi. (Li Dongyuan) Decoct in water, mix with five qian of cooked Zao Ren (Semen Ziziphi Spinosae) powder, take before bed to treat insomnia due to heart deficiency. Combined with Mai Dong (Ophiopogonis Radix), Zao Ren, Yuan Zhi (Polygalae Radix), Dan Shen (Salviae Miltiorrhizae Radix et Rhizoma), Fu Shen (Poria cum Radix), Zhu Sha (Cinnabaris), and Xi Jiao (Rhinocerotis Cornu), it treats heat accumulation in the Heart meridian, deficiency vexation, and insomnia. Added to Bai Hu Tang (White Tiger Decoction), it treats febrile disease with vexation-heat, excessive thirst, and epidemic jaundice. Formula: Dan Zhu Ye 5 sheng, Xiao Mai (Tritici Fructus) 7 sheng, Shi Gao (Gypsum Fibrosum) 3 liang, water 1 dou 5 sheng, decoct to 7 sheng, take all at once for cure. Note: Mania and restlessness differ from deficiency vexation. Using Bai Hu Tang with Dan Zhu Ye to treat febrile disease with vexation-heat and excessive thirst belongs to the category of mania and restlessness. Using Dan Zhu Ye Tang (containing only Dan Zhu Ye, Mai Dong, Gan Cao, Xiao Mai, Sheng Jiang, Da Zao), adding Ren Shen for palpitations/deficiency, and Nuo Mi for weakness, to treat postpartum shortness of breath and restlessness, belongs to the category of deficiency vexation. Deficiency vexation further differs by qi and blood. For example, Jia Wei Dan Zhu Ye Tang uses Di Huang (Rehmanniae Radix) instead of Zhi Mu (Anemarrhenae Rhizoma) to treat persistent heat after sweating and purgation in pregnancy, indicating deficiency in the blood level. Zhu Ye Dang Gui Tang, combining Ren Shen and Bai Zhu, using only Dan Zhu Ye and Mai Dong to clear postpartum deficiency heat, treating dry mouth, thirst, and aversion to cold drinks/food, indicates deficiency in the qi level. From this, we understand the application for xiao ke, as well as for high fever, cephalalgia due to wind, hematemesis, heat-toxin, and wind pathogens, all resulting from yang lacking yin leading to hyperactive yang. What is called "supplementing yuan qi" is essentially yang containing yin.