得火良。
辛、甘，大温，有小毒。入足阳明经气分。能引药势上行。逐风痰，驱寒湿。一切头面
百病
，心痛血痹，阴囊湿痒，急慢惊风，痘疮风寒不解，四肢头面不起者，用以散解甚效。配南
星、半夏，生研猪胆丸，治小儿暑风痰迷搐搦。配僵蚕、全蝎，等分生研为末，热酒下，治
中风口 。配藿香，等分为末米饮下，治小儿吐逆不止。炮用。脾虚慢惊，阴虚中风，二者
禁用。
即虎掌
得火、牛胆良。蜀漆为之使。畏附子、干姜、防风、生姜。恶莽草。伏雄黄
、丹砂、焰硝。
辛、苦、温。有毒。入手足太阴经。主风痰之流滞，（半夏走肠胃，南星走经络。）祛四
肢之麻痹。散血攻积，下气
堕胎。敷疥癣疮毒，并蛇咬损伤。得防风，治麻木。配川柏，使下行。配苍术、生姜，治痰
湿臂痛。配荆芥、姜汁，治
风痰头痛。配石菖蒲，涂口 舌糜。佐天麻，疗吐泻惊风。君琥珀、朱砂，除痰迷心窍。配
冰片，等分，五月五日午时
合之，以指粘末揩牙齿左右，开中风口噤目瞑，无门下药危症。
白矾汤或皂角汁浸三日夜，晒干，再酒浸一宿，蒸至不麻而止，或生姜渣、黄坭包煨熟，
去
坭焙用。得火炮则不毒。虚痰、燥痰禁用。
造南星曲法∶以姜汁、矾汤，和南星末作小饼子，安篮内，楮叶包盖，待上黄衣，乃取
晒收
之。造胆星法∶以南星生研末，腊月取黄牯牛胆汁和匀，纳入胆中，悬风处干之。年久者弥
佳。
虽曰南星主痰，半夏主湿，然湿痰横行经络，壅滞不通，至语言费力，身手酸疼者，惟
南星为能，合诸药开导其痰，
而湿气顿消。其有湿生火、火生痰，痰火相搏而成风象，口眼 斜，手足瘫痪，诸症悉见者、
惟半夏为能，从清火之剂，
以降
其湿，而风痰悉化。总在用之者得当耳。
遇到火则药性更佳。
味辛、甘，性大温，有小毒。归足阳明经气分。能引导药势向上运行。驱逐风痰，驱散寒湿。对于头面部各种疾病，心痛及血痹，阴囊潮湿瘙痒，急惊风和慢惊风，痘疮因风寒不解导致四肢头面浮肿不起的情况，使用它能起到很好的消散和解表作用。配伍南星、半夏，生研后以猪胆汁制成丸剂，治疗小儿暑热风痰迷心引起的抽搐。配伍僵蚕、全蝎，等分生研为粉末，用热酒送服，治疗中风口眼歪斜。配伍藿香，等分为粉末，用米汤送服，治疗小儿呕吐不止。需炮制后使用。脾虚导致的慢惊风，阴虚导致的中风，这两种情况禁用。
即虎掌（天星的别名）
遇火或牛胆汁则药性更佳。蜀漆为其引经药。畏惧附子、干姜、防风、生姜。厌恶莽草。可被雄黄、丹砂、焰硝所克制。
味辛、苦，性温。有毒。归手足太阴经。主治风痰的流滞，（半夏走肠胃，南星走经络。）祛除四肢的麻痹。散血破积，下气堕胎。外敷治疗疥癣疮毒，以及蛇咬损伤。配伍防风，治疗麻木。配伍川柏，使药力下行。配伍苍术、生姜，治疗痰湿引起的臂痛。配伍荆芥、姜汁，治疗风痰头痛。配伍石菖蒲，涂抹治疗口舌糜烂。佐使天麻，治疗吐泻惊风。作为主药配伍琥珀、朱砂，清除痰迷心窍之症。配伍冰片，等分，在五月五日午时合研，用手指蘸取粉末擦拭牙齿左右两侧，用于开通中风牙关紧闭、目闭神昏、无法服药的危重病症。
用白矾汤或皂角汁浸泡三昼夜，晒干，再用酒浸泡一夜，蒸至不再产生麻感为止；或者用生姜渣、黄泥包裹煨熟，去泥焙干后使用。经火炮制则无毒。虚痰、燥痰禁用。
制作南星曲的方法：用姜汁、矾汤，调和南星粉末做成小饼状，放在篮子里，用楮叶包裹覆盖，待表面长出黄色菌衣后，取出晒干收藏。
制作胆星的方法：将南星生研成粉末，腊月时取黄牛胆汁混合均匀，纳入牛胆中，悬挂在通风处晾干。年代越久越好。
虽然常说南星主治痰，半夏主治湿，然而当湿痰横行于经络，壅滞不通，导致语言费力、身体手脚酸痛时，只有南星能够配合其他药物开导其痰，从而使湿气顿时消除。如果有湿生火、火生痰，痰火相搏形成风象，出现口眼歪斜、手足瘫痪等各种症状时，只有半夏能够配合清火药剂，以降其湿，从而使风痰全部化解。关键在于使用者运用得当罢了。
It is beneficial when exposed to fire.
Acrid, sweet, excessively warm, slightly toxic. Enters the Qi level of the Foot-Yangming Meridian. It can guide the medicinal effect upward. It expels wind-phlegm and dispels cold-dampness. It is highly effective in dissipating and resolving all kinds of diseases of the head and face, heart pain and blood bi (blood stasis syndrome), damp itching of the scrotum, acute and chronic convulsive disorders (Jing Feng), and cases where the limbs and face fail to rise due to unresolved wind-cold in smallpox/variolae. When combined with Tianxing (Arisaema Cum Bile) and Banxia (Pinellia Rhizome), ground raw and formed into pills with pig bile, it treats pediatric summerheat wind-phlegm confusion and convulsions. Combined with Jiangcan (Bombyx Batryticatus) and Quanxie (Scorpio), ground raw in equal parts into powder, taken with hot wine, it treats facial paralysis (stroke with mouth deviation). Combined with Huoxiang (Agastache Herba), powdered in equal parts, taken with rice water, it treats persistent vomiting in children. Use after processing. Contraindicated in slow convulsive disorders due to Spleen deficiency and stroke due to Yin deficiency.
Also known as Huzhang (Tiger Palm).
Beneficial when exposed to fire or ox bile. Shuqi (Perilla Leaf) acts as its guiding herb. It is inhibited by Fuzi (Aconite Lateral Root), Ganjiang (Dried Ginger), Fangfeng (Saposhnikovia Root), and Shengjiang (Fresh Ginger). It is antagonistic to Mangcao (Genkwa Flower). Its toxicity can be subdued by Xionghuang (Realgar), Dansha (Cinnabar), and Yanxiao (Saltpeter).
Acrid, bitter, warm. Toxic. Enters the Hand-Taiyin and Foot-Taiyin Meridians. It governs the stagnation of wind-phlegm (Banxia travels through the intestines and stomach, whereas Tianxing travels through the meridians). It dispels numbness in the four limbs. It disperses blood and attacks accumulations, directs Qi downward, and induces abortion. Applied externally for tinea, sores, ulcers, and snake bites/injuries. Combined with Fangfeng, it treats numbness. Combined with Chuanbai (Phellodendron Bark), it directs the action downward. Combined with Cangzhu (Atractylodes Rhizome) and Shengjiang, it treats arm pain due to phlegm-dampness. Combined with Jingjie (Schizonepeta Spike) and ginger juice, it treats headache due to wind-phlegm. Combined with Shichangpu (Acorus Rhizome), applied topically, it treats oral and lingual ulceration. Assisted by Tianma (Gastrodia Rhizome), it treats vomiting, diarrhea, and convulsions. As the sovereign herb combined with Hupo (Amber) and Zhusha (Cinnabar), it clears phlegm confusing the mind orifices. Combined with Bingpian (Borneol), in equal parts, prepared at noon on the fifth day of the fifth lunar month, rubbed onto the teeth on both sides with a finger, it opens the jaw lock, closed eyes, and unconsciousness in critical stroke patients who cannot take medicine.
Soak in Alum Decoction or Gleditsia Sinensis Juice for three days and nights, dry in the sun, then soak in wine for one night, steam until the numbing sensation ceases; or wrap in ginger residue and yellow clay, bake until cooked, remove the clay, and roast for use. Processing with fire eliminates its toxicity. Contraindicated in deficiency-phlegm and dry-phlegm.
Method for preparing Nanxing Qu (Southern Arisaema Fermented Cake): Mix Nanxing powder with ginger juice and alum decoction to form small cakes, place them in a basket, cover with Cecropia leaves, wait for yellow mold to grow, then take out, dry, and store.
Method for preparing Danxing (Ox Gallstone Arisaema): Grind raw Nanxing into powder, obtain yellow bull gallbladder juice in the twelfth lunar month, mix evenly, insert into the gallbladder, and hang in a ventilated place to dry. The older, the better.
Although it is said that Nanxing primarily treats phlegm and Banxia primarily treats dampness, when damp-phlegm runs rampant in the meridians, causing obstruction, leading to difficulty in speech and soreness/pain in the body and limbs, only Nanxing can, in combination with other herbs, open up and guide the phlegm, thereby instantly eliminating the dampness. In cases where dampness generates fire, and fire generates phlegm, with phlegm-fire clashing to create wind-like symptoms such as facial deviation and limb paralysis, appearing in various syndromes, only Banxia can, from the perspective of clearing heat and fire agents, descend the dampness, thereby transforming all wind-phlegm. Ultimately, it depends on the appropriate application by the practitioner.