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Fuzi (Aconiti Lateralis Radix Praeparata) completely inherits the dry and fierce qi of fire and earth in the ground, and additionally receives the hot qi from heaven. Therefore, its flavor is greatly pungent and hot, slightly sweet and bitter, and possesses great toxicity. Its qi is dense while its taste is thin; it belongs to yin within yang, with descending action predominating over ascending, floating yet containing sinking qualities, reaching everywhere. It enters the Hand Jueyin Pericardium Meridian and Mingmen (Gate of Vitality), the Hand Shaoyang Sanjiao Meridian, and concurrently enters the Foot Shaoyin Kidney Meridian and Foot Taiyin Spleen Meridian. Its nature is mobile and unstatic, making it a crucial herb for vigorously tonifying Yuan Yang (the body's fundamental Yang energy) and expelling Wind, Cold, and Dampness pathogens.

The mother plant of Fuzi is Wutou (Aconiti Radix). The one growing separately is called Fuzi; those growing attached are called Cizi (Aconiti Lateralis Radix); the slender ones are called Tianxiong (Aconiti Radix); those bifurcated into two prongs are called Wuhui (Aconiti Radix). These five substances originate from the same source but have different names. Those produced in Sichuan, with black skin, round shape, flat base, and weighing more than one tael, are considered superior. Larger Fuzi has stronger potency, while smaller ones have weaker potency. They should be processed and cooked before use, which enhances their tonifying effects. It primarily treats deep-seated cold in the five zang organs and cold reversal of the four limbs; it strengthens Yuan Yang and Yuan Fire, dissipates Yin-dampness and Yin-cold. Its efficacy specializes in moving without staying static, guiding other herbs to circulate through all meridians, warming the waist and knees, strengthening gait and bones/tendons, and fortifying Yin. For cold toxins in the Three Yin meridians, only this herb can restore Yang; for cold reversal in the Three Yang meridians, no other herb can rescue the condition. It treats wind-cold cough and adverse Qi, warms the middle jiao, breaks up hardness and accumulations, treats cold-damp flaccidity and spasms, cold pain in feet/knees, cold pain in waist/spine/heart/abdomen, cholera with tendon twitching, dysentery due to middle-jiao cold, stroke, Qi syncope, Phlegm syncope, Yin-toxin abdominal pain, cold malaria, wind-bi syndrome; for deficiency patients with dysphagia/swelling, cold pain/numbness, Ben Tun (rushing pig qi), sudden diarrhea with Yang collapse, spleen diarrhea with chronic dysentery, floating deficient Yang, Yin-cold below, Kidney-Jue headache, Yang-deficiency blood disorders, pediatric convulsions/slow spleen, gray-white pustules, non-healing carbuncles/fistulas, and all symptoms of deep-seated stubborn cold, it is indispensable. In cases of true invasion and true cold in the Yin meridians, raw Fuzi can be used to resist the pathogen. Pregnant women must avoid it as it causes abortion rapidly.

Wutou is the mother of Fuzi. Some claim spring harvest yields Wutou and winter harvest yields Fuzi, which is incorrect. Fuzi has a heavy and stagnant nature, warming the Spleen to drive out Cold. Wutou has a light and dispersing nature, warming the Spleen to dispel Wind. For Cold syndromes, use Fuzi; for Wind syndromes, use Wutou. Both tonify the Lower Jiao, but their therapeutic focuses differ slightly. Wutou is round and pointed, expectorates Wind-Phlegm, treats epilepsy, utilizing its sharp Qi to reach the disease site directly. Cizi disperses to the four limbs and fills the skin/hair, treating various Bi syndromes of the hands and feet due to Wind-Dampness. Tianxiong is large and long, treating cold-damp cold-Bi, joint pain and spasms, opening orifices and benefiting cavities, relying on its pungent-hot moving properties, equal in function to Wutou. Some say: to tonify deficiency-cold, use Fuzi; to disperse Wind-Dampness, use Tianxiong. Others say: Tianxiong’s nature refuses to descend and moves upward, thus it can disperse and tonify Upper Jiao Yang deficiency. Still others say: Tianxiong and Wutou have vigorous Qi and heroic nature, both are herbs tonifying Lower Jiao Mingmen Yang deficiency; tonifying the lower benefits the upper. If Upper Jiao Yang deficiency occurs (involving Heart and Lung), it pertains to Yuan Yang of Yuan Qi, not the True Fire of True Yang; tonification should involve herbs like Renshen (Ginseng). Why use heroic Fuzi? Moreover, Wutou and Fuzi are hot and harmful if they move recklessly; borrowing them to penetrate deep-seated cold and stubborn closure is acceptable for warming the middle and dispersing cold. However, if one desires warming combined with tonification, Renshen must be the sovereign herb, or herbs acting on the fundamental Qi level, to achieve this. Yang refers to vigorous Qi, heat, and movement; Yin refers to extreme Qi deficiency, cold, and stagnation. Only herbs that warm and tonify the Qi level can make it vigorous and moving, warm and penetrating. This is where the method of warming and tonifying applies. Their function of warming and restoring Yang lies in Wutou and Fuzi, while their function of tonifying Yuan Qi relies heavily on Renshen and Baizhu. For example, warming-tonifying formulas include Shenfu Tang (Ginseng and Aconite Decoction) and Zhufu Tang (Atractylodes and Aconite Decoction); mild-tonifying formulas include Dushen Tang (Single Ginseng Decoction) and Baizhu Gao (Atractylodes Paste). There is never a case of using single Fuzi Decoction to treat deep-cold deficiency collapse. Because warming meridians without tonification means weak Qi cannot circulate freely; although temporary warmth may occur, stagnation often remains. As the books state: guide Qi-tonifying herbs to chase lost Yuan Yang; guide Blood-nourishing herbs to support insufficient True Yin; guide dispersing herbs to expel exterior Wind pathogens; guide warming herbs to remove interior Cold-Dampness. Thus, the distinct merits of guiding herbs are clear. Furthermore: cooked Fuzi vigorously tonifies, so cooked Fuzi paired with Mahuang (Ephedra) provides tonification within dispersion; raw Fuzi disperses, so raw Fuzi paired with Ganjiang (Dried Ginger) provides dispersion within tonification. This shows different efficacies based on raw vs. cooked states. If Fuzi lacks Ganjiang, it is not hot enough; with Gancao (Licorice), its nature becomes mild; with Rougui (Cinnamon Bark), it tonifies Mingmen. These are established rules. The subtlety of variation depends on the practitioner. If one avoids Fuzi (greatly hot) and Dahuang (greatly cold) due to suspicion, how will one rescue critical conditions of extreme cold or heat? A skilled soldier makes no weak troops; a skilled physician sees no toxic herbs. Thus, books say: using urgent drugs for slow diseases disturbs the meridians; severe diseases require urgent drugs. Slow response fails to save life. Diseases can be deficiency-cold or deficiency-heat, but there is never cold without deficiency. Therefore, treating heat involves cooling-tonification or cooling-purgation, while treating cold requires warming-tonification combination. Wind can be dispersed; during extreme cold days, warm the middle and rescue the interior.

Main Indications (Combined Analysis with Smallpox/Rashes): Treats deep-cold causing cold reversal of four limbs. Used for any smallpox/rash cases failing to erupt due to cold, unremitting diarrhea, gray-white color with itching/collapse, chattering teeth due to cold, and Qi-deficiency deep-cold syndromes. It is best wrapped in coarse paper moistened with child’s urine, slowly roasted over low fire until thoroughly cooked, then peel off skin and umbilical scar, cut into four cross-shaped pieces. Soak in a decoction of Fangfeng (Saposhnikoviae Radix), Gancao (Licorice Root), and Heidou (Black Soybean) while hot, then dry and use. Alternatively, boil thoroughly in a concentrated decoction of these three alone, without needing child’s urine soaking. Over-processing makes the nature too mild.

Commentary: Fuzi possesses a heroic quality and the ability to breach gates. It must be driven by heavy doses of Renshen and Baizhu; otherwise, it causes significant harm. Consider ancient formulas like Shenfu Tang and Zhufu Tang; the principle is evident. Like a brave vanguard general, success requires logistical support behind him. Thus, Danxi stated: For Qi deficiency with severe heat, add a little Fuzi to facilitate the action of Renshen; it is also used for obese individuals with much dampness. "Ji Yan" states: Swelling arises from accumulation. If swelling recurs after accumulation is removed, using purgatives again will close minor swelling further, leaving doctors helpless. This is because Middle Jiao Qi fails to ascend/descend, blocked by Cold. Only taking Fuzi allows urination to resume naturally. Wu Shou stated: When Shanghan transmits to the Three Yin meridians, or Cold invades with Yin involvement, even if the body has high fever, if the pulse is deep, Fuzi must be used. For cold reversal, abdominal pain, deep-thin pulse, blue lips, and retracted scrotum, use it urgently; it has the power to revive the dead. Modern practitioners fail to understand disease patterns and drug properties, hesitating to use it until Yin is exhausted and Yang is depleted, at which point usage is too late. They do not know the book says: "As long as a fraction of Yang Qi remains, death does not occur." One must realize Yang is the root of life, the key to rescuing impending death, and a common herb for deficiency-cold indications. What is there to hesitate about? However, it must not be mistakenly taken for Yin deficiency with internal heat, or true internal heat with false external cold. (Refer to the commentary on Rougui for internal details).