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Acrid and hot, toxic. Used in wind-dispelling formulas. Boiled with Asari Radix (Xixin) and black beans, then incorporated into meridians-activating prescriptions. Processed with Glycyrrhizae Radix et Rhizoma (Gancao). According to the text, Wutou is the mother root of Fuzi. In spring, when new Fuzi sprouts, its mother root is harvested; this point has not been elucidated by various authors of Materia Medica. It is merely stated that those harvested in spring are called Wutou, leading the world to mistakenly identify Wutou as smaller Fuzi taken in spring, often substituting Cezhi for it, thereby misleading many people. Incompatible with Pinelliae Rhizoma (Banxia).

Invention: Wutou inherits the qi of spring generation, thus serving as a guide in treating wind disorders. It primarily treats stroke (Zhongfeng), aversion to wind, hemiplegia, Bi syndrome due to wind-cold-dampness, cold pain in the heart and abdomen, pain in the shoulders and thighs preventing flexion and extension, and chronic yin abscesses that fail to ulcerate or, once ulcerated, fail to heal due to cold sores with foul flesh. It is suitable to add small amounts to invigorate blood vessels, provided it is used appropriately. For slow convulsions in children with phlegm obstruction and syncope, raw Chuanwu (Sichuan Aconite) combined with Scorpio (Quanxie) decocted with fresh ginger is effective. The tip of Wutou ground into powder, taken with clear tea, induces vomiting of epileptic wind-phlegm, utilizing its sharp qi to reach the disease site directly from the lower jiao, aided by the emetic action of clear tea. Among incompatible drugs, Wutou and Banxia are the most prominent. Yet both the Chi Wan in *Jingui Yaolue* and the combination in *Pujifang* use these two together; only those who profoundly understand the sage's intent can discuss this.

Acrid and warm, highly toxic. It refers to the single tuber of Fuzi without lateral buds, which is more than double the size of normal Fuzi. Its processing method is the same as that of Fuzi.
*Shennong Benjing* states it treats severe wind-cold-damp Bi, joint pain with spasms and stiffness, breaks up accumulations and pathogenic qi, heals traumatic injuries, strengthens bone marrow, lightens the body, and improves mobility.
Invention: Tianxiong possesses pure yang nature, tonifying the Mingmen and Sanjiao, strengthening yang essence, and reinforcing kidney qi more powerfully than Fuzi. Thus, *Shennong Benjing* uses it to treat severe wind-cold opening damp-Bi, joint spasms, and other diseases; for those with yang deficiency and atrophy, it is used as an assistant to Ginseng Radix et Rhizoma (Renshen). Both Tianxiong and Fuzi have downward-moving properties; if there is upper jiao yang deficiency, one should use Renshen and [missing character], not these herbs. Furthermore, the tips of Wutou and Fuzi all grow downward, while their navels are where the shoots grow upward. Li Dongyuan and Zhang Yuansu mistakenly believed the tip was superior/upward, whereas Zhu Zhenheng correctly regarded it as an assistant for the lower part. *Zhouhou Beiji Fang*'s Sanjian Tang treats constitutional yuan yang deficiency with external invasion of cold pathogens, manifesting as cold limbs and deep pulse, as well as yin toxicity in cold damage. Processed Chuanwu, Fuzi, and Tianxiong in equal parts, take 4 qian per dose, adding 15 slices of fresh ginger and taking warm. *Jingui Yaolue* treats seminal emission in men using Tianxiong, Longgu, Guizhi, and Baizhu made into a powder, taken with wine, half a qian per dose; in Huainan, one piece of Tianxiong is placed inside a rooster's belly, boiled until soft, pounded, and eaten to induce courage, taking advantage of its ability to strengthen liver and kidney qi.