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Treats individuals with sallow complexion (mian se wei bai), faint voice, weakness in the four limbs, and a weak pulse. If there is internal heat, or if food is difficult to digest leading to acid regurgitation, this belongs to deficiency fire (xu huo).
It requires:
Ren Shen (Ginseng Radix), Bai Zhu (Atractylodis Rhizoma), Fu Ling (Poria), Gan Cao (Licorice Radix) (each 2 qian).
Decoct in water, add Sheng Jiang (Zingiberis Rhizoma Recens) and Da Zao (Jujubae Fructus).
Add Chen Pi (Citri Reticulatae Pericarpium), it becomes Wu Wei Yi Gong San (Five-Ingredient Decoction for Extraordinary Efficacy). Add Chen Pi (Citri Reticulatae Pericarpium) and Ban Xia (Pinelliae Rhizoma), it becomes Liu Jun Zi Tang (Six-Gentlemen Decoction).
Zhang Luyu said: For Qi deficiency, tonify with sweet flavors. Ren Shen (Ginseng Radix), Bai Zhu (Atractylodis Rhizoma), Fu Ling (Poria), Gan Cao (Licorice Radix) are sweet and warm, benefiting Stomach Qi, possessing the function of strengthening and transporting, and embodying the virtue of harmony.
Therefore, it is
Shou Yin
Zi Sui
He

Treats Qi deficiency causing swelling and fullness, accumulation of Phlegm-fluids (Tan Yin), disharmony of Spleen and Stomach, and the generation of various symptoms.
Ren Shen (Ginseng Radix) (1 qian), Bai Zhu (Atractylodis Rhizoma) (2 qian), Fu Ling (Poria) (2 qian), Gan Cao (Licorice Radix) (0.7 qian), Chen Pi (Citri Reticulatae Pericarpium) (0.8 qian), Ban Xia (Pinelliae Rhizoma) (1 qian).
Sha Ren (Amomi Fructus) (0.8 qian), Mu [Xiang] (Saussureae Radix).
Add Sheng Jiang (Zingiberis Rhizoma Recens) 2 qian, decoct in water and take orally.
Ke Yunbo said: The Classics state: "The strong recover as Qi moves; the frail become ill as Qi stagnates." Generally, humans exist within the interaction of Qi, born from Qi, and the generation of vital Qi fundamentally relies on Stomach Qi. Food enters the Yin, nourishing Yang; day and night they cycle, circulating internally and externally. If respiration/Qi movement ceases even for a breath, accumulations form, leading to distension, anorexia, or the production of Phlegm and retention of fluids. Consequently, muscles emaciate, wheezing, coughing, vomiting, and belching arise, various symptoms swarm forth, and the Spirit mechanism (Shen Ji) of transformation is severed. Liu Jun Zi Tang is the general formula for the Qi aspect.
Ran Er
Li
Shen
Zhe

Treats all conditions of Blood deficiency, Blood heat, and Blood dryness.
Dang Gui (Angelicae Sinensis Radix), Shu Di Huang (Rehmanniae Radix Preparata) (each 3 qian), Chuan Xiong (Ligustici Chuanxiong Rhizoma) (1.5 qian), Bai Shao (Paeoniae Radix Alba) (2 qian, stir-fried with wine).
The above four ingredients, decoct in water and take orally.
Zhang Luyu said: Si Wu Tang is a specialized agent for diseases affecting Yin-Blood, not the precise formula for tonifying True Yin. Medical texts uniformly claim Si Wu Tang tonifies Yin, thus using it to treat Yin deficiency fever...
Fen
Zhi
Tang
Must first regulate its Qi. It is also said that Si Wu Tang cannot achieve the merit of Yang generating Yin without Qi-tonifying herbs. Truly, these words are correct! However, I have often stated that this decoction, after the resolution of Fire pathogen in Shang Han (Cold Damage), where residual heat remains in the Blood aspect, causing slight fever at night that does not cease, when combined with Chai Hu (Bupleuri Radix) or added with Gui Zhi (Cinnamomi Ramulus), responds effectively immediately. Its merits should not be overlooked.