蒸过晒干用。
甘，平，无毒。补中气而安五脏，益脾胃而润心肺，填精髓而助筋骨，除风湿而下三虫。
南北皆有，以茅山、嵩山者良。苗高一二尺。叶如竹而短，两两相对。茎梗柔脆，颇似桃枝
，本黄末赤。四月开青白花，状如小豆花。结子白如黍粒，亦有无子者。根如嫩生姜而黄。
二八月采根。亦可劈根稀种之，一年后极稠，子亦可种。以所来多伪，近世稀用矣。
汤泡数日，姜汁制用。射干为使，恶皂角，畏雄黄、生姜、干姜、秦皮、龟甲，反
乌头，忌羊血、海藻、饴糖。陈久者良。
辛，温，有毒。入足阳明胃，手阳明、太阴、少阴诸经。降胃止呕，驱痰除湿。解伤寒
之寒
热，消心胸之结满。咳逆头眩之疾，痈肿咽痛之 。胎前勿用。
在处有之，以齐州者为良。二月生苗一茎，茎端三叶，浅绿色，颇似竹叶。生江南者似
芍药
叶。根下相重，上大下小，皮黄肉白。八月采根。
小儿吐泻，同生姜、陈粟米煎服。（验方第一。）
小儿腹胀，酒丸粟大，每十丸，姜水下。或姜汁合末，敷脐上。（第二。）
霍乱腹胀，同肉桂末服。（第三。）
白浊梦遗，与猪苓同炒，去猪苓，入蛎粉丸服。（第四。）
八般头风，为末，入百草霜少许，作纸捻烧烟，就鼻内 之。口中含水，有涎，吐去再
含。（第五。）
喉痹肿塞，生末 鼻，涎出效。（第六。）
木舌胀大，醋煎含漱。（第七。）
面上黑气，焙末，米醋合敷。忌片连，敷三日，皂角汤洗，面如玉也。（第八。）
子肠不收，生末吹鼻。（第九。）
小儿惊风不省。同上。（第十。）
猝死不寤。同上。（十一。）
五绝急死。同上。（十二。）
痈疽发背，鸡子清合末敷之。（十三。）
吹奶肿痛，煨末，姜酒下立瘥。又取末入鼻。（十四。）
打扑瘢痕，为末，水调敷之，一宿即没。（十五。）
远行足趼。同上。（十六。）
飞虫入耳，生末，香油合敷耳门外。（十七。）
蝎虿螫人，水合末敷。（十八。）
骨哽咽中，同白芷末服，取呕。（十九。）
心痛正在心下，按之益痛，半夏、瓜蒌、黄连、干姜、白芍、甘草，偏左右者，加
柴胡；无火者，去黄连；寸脉弱，加参。（二十。）
眉棱骨痛，半夏、羌活、酒芩、白芷。（二十一。）
子悬逆上捧心，半夏、枳壳、瓜蒌、香附、拣砂、白芍、苏梗、陈皮、生姜。去半夏，
加丹参、青皮尤良。（二十二。）
半夏泻心汤 半夏 人参 甘草 干姜 黄芩 黄连 大枣
治心下痞满不痛。又治呕而肠鸣，心下痞。（诸方第一。）
大半夏汤 半夏 人参 蜜
取流水扬之二百四十遍。治反胃。（第二。）
姜半汤 半夏 生姜
末服。治干呕吐涎。（第三。）
小半夏汤 半夏 生姜
治呕而不渴。（第四。）
越婢加半夏汤 麻黄 石膏 甘草 生姜 大枣 半夏
治肺胀喘咳上气，目如脱，脉浮大。（第五。）
半夏汤、散 半夏 甘草 桂枝
汤散俱可。治少阴咽痛。（第六。）
半夏麻黄丸 半夏 麻黄 蜜
治心下悸者。（第七。）
Steamed and then dried in the sun for use.
Sweet, neutral, non-toxic. Tonifies the Middle Jiao (Middle Burner) and calms the Five Zang Organs, benefits the Spleen and Stomach, moistens the Lungs and Heart, fills the Essence and Marrow, assists the sinews and bones, dispels Wind-Dampness, and drives down the three types of intestinal parasites.
Available in both North and South China; those from Maoshan and Songshan are considered superior. The seedling grows one to two chi high. Leaves resemble bamboo leaves but are shorter, growing in opposite pairs. The stem is soft and brittle, somewhat resembling peach branches; the base is yellow and the tip reddish. In April, it blooms with pale green-white flowers, resembling soybean flowers. It bears white seeds like millet grains, though some varieties do not produce seeds. The root resembles tender ginger and is yellow.
Harvest the roots in the second and eighth lunar months. Roots can also be split and planted sparsely; after one year, they grow very dense. Seeds can also be used for propagation. Due to the prevalence of counterfeits, it is rarely used in recent times.
Soak in hot water for several days, then process with Ginger Juice. Shegan (Belamcanda Rhizome) acts as an assistant herb. It opposes Gaojiao (Gleditsia Sinensis Fruit), fears Xionghuang (Realgar), Shengjiang (Fresh Ginger), Ganjiang (Dried Ginger), Qinpi (Ailanthus Bark), and Guijia (Tortoise Shell); it is incompatible with Wutou (Aconite Root). Avoid consuming Yangxue (Sheep Blood), Haizao (Sargassum), and Yitang (Maltose). Aged material is preferred.
Pungent, warm, toxic. Enters the Foot-Yangming Stomach Meridian, as well as the Hand-Yangming Large Intestine Meridian, Hand-Taiyin Lung Meridian, and Hand-Shaoyin Heart Meridian. Descends rebellious Qi to stop vomiting, expels Phlegm and Dampness. Resolves cold and heat symptoms of Shanghan (Cold Damage), dissipates fullness and stagnation in the chest and heart. Treats cough with reverse-flowing Qi and dizziness, as well as carbuncles and sore throat. Contraindicated during pregnancy.
Found everywhere; those from Qizhou (modern Jinan, Shandong) are superior. In February, a single stem emerges with three leaves at the tip, light green, resembling bamboo leaves. Those grown in Jiangnan have leaves resembling Peony leaves. The roots overlap, larger at the top and smaller at the bottom, with yellow skin and white flesh. Harvest roots in August.
For infantile vomiting and diarrhea, decoct Banxia (Pinellia Rhizome) with Shengjiang (Fresh Ginger) and Chen Suli (Aged Millet) and administer orally. (Verified Formula 1.)
For infantile abdominal distension, form pills the size of millet seeds using wine, take ten pills per dose with Ginger Water. Alternatively, mix powder with Ginger Juice and apply to the umbilicus. (2.)
For Huoluan (Cholera-like syndrome) with abdominal distension, take together with Rougui (Cinnamon Bark) powder. (3.)
For cloudy urine and nocturnal emission, stir-fry Banxia with Zhuling (Polyporus) together, remove Zhuling, add Limian (Oyster Shell Powder), form into pills, and take. (4.)
For various types of Toufeng (Head Wind/Headache), grind into powder, add a small amount of Baicaoshuang (Soot from Hundred Herbs), roll into paper twists, ignite, and inhale the smoke into the nose. Hold water in the mouth, spit out when saliva flows, and repeat. (5.)
For Houbi (Sore Throat) with swelling and obstruction, blow raw powder into the nose; efficacy is indicated by the discharge of phlegm. (6.)
For Mushe (Wooden Tongue) with enlargement, decoct with vinegar and gargle. (7.)
For black qi on the face, roast and grind into powder, mix with Rice Vinegar, and apply externally. Avoid eating bread with skin. Apply for three days, then wash with Gaojiao (Gleditsia) soup; the face will become as white as jade. (8.)
For prolapse of the rectum (Zichang Bushou), blow raw powder into the nose. (9.)
For infantile convulsions with loss of consciousness. Use same method as above. (10.)
For sudden death with unconsciousness. Use same method as above. (11.)
For "Five Extinctions" acute death (critical conditions where vital signs cease). Use same method as above. (12.)
For Yongju Fabei (Carbuncles on the back), mix powder with Egg White (Jizi Qing) and apply externally. (13.)
For Chuinai (Lactational Mastitis) with swelling and pain, roast and grind into powder, take with Ginger Wine for immediate recovery. Also, blow powder into the nose. (14.)
For bruises and scars from trauma, grind into powder, mix with water, and apply externally; it disappears overnight. (15.)
For calluses on feet from long-distance walking. Use same method as above. (16.)
For insects entering the ear, use raw powder mixed with Sesame Oil, applied to the outside of the ear. (17.)
For bites from scorpions or centipedes, mix powder with water and apply externally. (18.)
For bone stuck in the throat, take with Baizhi (Angelica Dahurica) powder to induce vomiting and expel the bone. (19.)
For Heart Pain located exactly below the heart, worsened by pressure: Banxia (Pinellia Rhizome), Gualou (Trichosanthes Fruit), Huanglian (Coptis Rhizome), Ganjiang (Dried Ginger), Baishao (White Peony Root), Gancao (Licorice Root). If pain is偏 left or right, add Chaihu (Bupleurum Root). If there is no Fire, remove Huanglian. If the Cun pulse is weak, add Renshen (Ginseng Root). (20.)
For pain in the supraorbital ridge: Banxia (Pinellia Rhizome), Qianghuo (Notopterygium Rhizome), Jiuhuangqin (Wine-processed Scutellaria Root), Baizhi (Angelica Dahurica). (21.)
For Zixuan (Fetal Distension with Qi rushing upward to the chest): Banxia (Pinellia Rhizome), Zhike (Aurantii Fructus), Gualou (Trichosanthes Fruit), Xiangfu (Cyperus Rhizome), Jiansha (Cardamom), Baishao (White Peony Root), Sugeng (Perilla Stem), Chenpi (Citrus Peel), Shengjiang (Fresh Ginger). Removing Banxia and adding Danshen (Salvia Root) and Qingpi (Aurantii Fructus Immaturus) is even better. (22.)
Banxia Xiexin Tang (Pinellia Decoction to Drain the Epigastrium): Banxia (Pinellia Rhizome), Renshen (Ginseng Root), Gancao (Licorice Root), Ganjiang (Dried Ginger), Huangqin (Scutellaria Root), Huanglian (Coptis Rhizome), Dazao (Jujube Fruit).
Treats epigastric fullness and stuffiness without pain. Also treats vomiting with borborygmus (stomach rumbling) and epigastric stuffiness. (First among Various Formulas.)
Dabanxia Tang (Major Pinellia Decoction): Banxia (Pinellia Rhizome), Renshen (Ginseng Root), Honey.
Take running water, splash it 240 times. Treats regurgitation (Fanwei). (Second.)
Jiangban Tang (Ginger-Pinellia Decoction): Banxia (Pinellia Rhizome), Shengjiang (Fresh Ginger).
Grind into powder and take. Treats dry retching with salivation. (Third.)
Xiaobanxia Tang (Minor Pinellia Decoction): Banxia (Pinellia Rhizome), Shengjiang (Fresh Ginger).
Treats vomiting without thirst. (Fourth.)
Yebijia Banxia Tang (Yi Bi Decoction Plus Pinellia): Mahuang (Ephedra Herb), Shigao (Gypsum Fibrosum), Gancao (Licorice Root), Shengjiang (Fresh Ginger), Dazao (Jujube Fruit), Banxia (Pinellia Rhizome).
Treats Lung distension with wheezing, cough, and rebellious Qi; eyes protruding as if about to fall out; floating and large pulse. (Fifth.)
Banxia Tang/San (Pinellia Decoction/Powder): Banxia (Pinellia Rhizome), Gancao (Licorice Root), Guizhi (Cinnamon Twig).
Both decoction and powder are suitable. Treats Shaoyin sore throat. (Sixth.)
Banxia Mahuang Wan (Pinellia and Ephedra Pill): Banxia (Pinellia Rhizome), Mahuang (Ephedra Herb), Honey.
Treats palpitations in the epigastrium. (Seventh.)