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Whenever **Mangxiao** (Natrii Sulfas) is used in a decoction, along with **Yihu** (Maltose Paste) or **Ejiao** (Donkey-hide Gelatin), one must wait until the decoction is cooked, strain it to obtain the pure liquid, and then add these substances into it. Boil again for two or three boils until they are completely melted before taking.

When adding wine, vinegar, **Tongbian** (Child's Urine), **Zhuli** (Bamboo Sap), or **Jiangzhi** (Ginger Juice) to a decoction, use the strained decoction to mix and take them.

For aromatic and penetrating herbs such as **Chenxiang** (Aquilaria Wood), **Muxiang** (Aucklandiae Radix), **Ruxiang** (Olibanum), and **Moyao** (Myrrha) used in decoctions, grind them into fine powder. After the decoction is ready, strain it first, mix the powder with a small amount of the liquid in a covered cup, consume it, and then drink the rest of the decoction.

For pills intended to unblock the bowels, if they contain harsh purgatives like **Badou** (Crotonis Fructus), Mangxiao, or **Dahuang** (Rhei Radix et Rhizoma), they must be coated with wax. This ensures they do not dissolve at the diaphragm but reach the lower jiao, thereby sparing the spleen and stomach from damage. However, this precaution is unnecessary for individuals with robust constitutions.

For diseases located above the chest and diaphragm, take medicine after meals; for diseases below the heart and abdomen, take medicine before meals; for diseases in the blood vessels and limbs, take them on an empty stomach in the morning; for diseases in the bone marrow, take them at night when full. To regulate the spleen qi, take the medicine slowly long after meals, and do not eat immediately after taking it. To tonify kidney essence, take it before meals in a single dose or multiple doses; food can be taken after medication, preferably meat or delicious foods, as this accelerates the generation of essence and blood. Therefore, for upper body ailments, frequent small doses are preferred; for lower body ailments, frequent larger doses are acceptable. Small doses nourish the upper body; large doses strongly tonify the lower body.

When decocting liquids or preparing pills and powders, entrust the task to honest, cautious, and trusted individuals; even subtle details require care. Wash decoction vessels thoroughly, use fresh sweet water, simmer over low heat, filter accurately according to dosage, and administration will naturally be effective. Often, decoction is entrusted to maids or servants who may use high fire to dry it quickly without extracting the juice, or allow it to boil over, losing the true juice and replacing it with tea water. In making pills and powders, ash and dirt may contaminate them; improper processing and arbitrary soaking in water or wine occur. Thus, even if the prescription is correct, efficacy is hard to achieve.

Ren Shen (Ginseng Radix) derives its nature from the clear yang qi of the earth and is born under the command of spring's growing shaoyang energy. Its taste is sweet and slightly cold, non-toxic. Its aroma and flavor are balanced, neither strong nor weak, with ascending properties outweighing descending ones. Some say it is slightly warm, referring to its function; others say slightly cold, referring to its inherent nature. It can be collected, briefly boiled in hot water, removed, dried by baking or air-drying in a windless place. Those harvested with skin have stronger potency; those harvested when overly ripe and peeled have milder potency. Before use, slice thinly and simmer in silver or earthenware pots. For pills and powders, dry lightly over paper using mild heat. For long-term storage, mix with roasted rice, seal in a jar, and it will remain intact while absorbing grain qi.

Ren Shen tastes sweet, aligning with the central element of the Five Elements; its nature is warm, harmonizing with the four seasons. It receives the ascending and generating qi of heaven's spring and the refined clear yang spirit of the earth. Its shape resembles a human form, corresponding to the Yao Guang star. Thus, it can restore yang qi at the brink of collapse and dispel deficiency pathogens instantly. Its merit tops all herbs, and its power equals precious cinnabar. It enters the Spleen and Lung meridians, regulating all deficiencies and tonifying all five zang organs. When taken by deficient persons, it is like spring arriving, causing all things to grow, akin to hunger being satisfied by food or thirst quenched by drink. Generally, obese and fair-skinned people can take more, while dark and thin people should take less, though this is a generalization. It benefits the deficiency of true yuan in the five zang organs, regulates shortness of breath due to lung metal deficiency, drains fire pathogens from the heart, lungs, spleen, and stomach, treats upward reversal of deficiency fire due to labor injury, strengthens pulses and regulates the middle, generates fluids and relieves thirst, opens the mind and enhances wisdom, tonifies primal yang, dispels palpitations, eliminates dream disturbances, treats cold in the intestines and stomach, drum-like pain in the heart and abdomen, and fullness/reversal in the chest and hypochondrium; breaks down hard accumulations, promotes stagnation, removes forgetfulness, stimulates sexual function, benefits spirit, and calms the soul. When qi is strong, the stomach opens naturally; when qi is harmonious, food digests easily. It is a holy medicine for retreating deficiency fire. Its primary function is tonifying the middle, but there are indications and contraindications for deficiency-cold and deficiency-heat. Ancient and modern discussions vary, but generally, cold and heat are not rigidly restricted, whereas deficiency and excess must be distinguished. If it is merely weakness, why doubt single usage? If there are specific cold or heat symptoms, combine with other herbs; if cold, warm, cool, or hot herbs are combined properly, both cold and heat conditions can be treated suitably. The key lies in accurately assessing deficiency and excess. Qi deficiency cannot be overlooked, nor can blood deficiency. Without yang, yin cannot generate; thus, in blood loss, tonify qi because qi is the mother of water. It truly saves critical conditions, generating the tangible from the intangible. Large doses promote circulation; small doses may cause stagnation. Combined with **Fuling** (Poria) and **Baizhu** (Atractylodis Macrocephalae Rhizoma), it dries dampness; with **Shudi Huang** (Rehmanniae Radix Preparata), it tonifies; with **Maidong** (Ophiopogonis Radix), it clears and moistens. Different adjuvants yield different effects. However, if the lung pulse is surging and solid, fire qi is reversing, blood heat causes reckless bleeding, qi is not yet deficient, sand disease has just started with no spots formed, or cold damage has just begun with intense pathogenic heat, using Ren Shen is dangerous. The fault lies with the person, not the herb. Regarding its ability to sober up alcohol: since alcohol greatly damages yuan qi, Ren Shen tonifies vitality to overcome alcohol toxicity. In chronic ulcerating sores, it is used in external surgical applications; in chronic eye diseases, it is used in ophthalmic preparations, both showing efficacy. Thus, its internal function of tonifying deficiency and supporting yuan is evident. Even injuries to muscles and skin lacking spiritual connection are preserved by it, let alone organs with spirit and emotion! When qi, blood, yin, and yang are in crisis, how can we not rely on it for rescue?! If processed into a paste, its efficacy is superior. Han Feixia said: "Ren Shen paste restores yuan qi to the realm of nothingness." It yields miraculous results in postpartum conditions, post-illness states, and after pus discharge from sores where yuan qi has not recovered.

Main Indications (Combined Analysis with Smallpox/Rash Diseases): It is the holy medicine for treating rash diseases. It is contraindicated three days before the appearance of rashes. It tonifies yuan qi and harmonizes the middle, generates fluids and relieves thirst, calms the spirit and strengthens pulses, supports the interior and expels pus. It is essential for qi-deficiency type rashes. It tonifies the middle to prevent internal collapse and secures the exterior to prevent external erosion, allowing righteous qi to overcome pathogenic qi, driving toxins out. It allows toxins to transform through pus formation. Even with strong pathogens, they cannot cause harm. Because intangible yuan qi generates endlessly, tangible diseases gradually dissipate. However, it is contraindicated when heat toxin is abundant; when blood heat is present at the initial stage of rashes; in phlegm obstruction syndromes; and in severe cough due to lung heat. If unavoidable, soaking it in bitter tea soup before use is permissible as a temporary measure. Taking it with Chenpi (Citri Reticulatae Pericarpium) while decocting may instead leak yuan qi. Therefore, it should not be taken together for conditions of extreme deficiency. Ancients included it in digestion-promoting formulas to strengthen qi and enhance transport, assisting the spleen's function. In dispersing formulas, it nourishes righteousness to aid in expelling pathogens, leaving no room for pathogens to remain.