Yi Gong San异功散

Extraordinary Merit Powder

Tonifying 补益剂Tonify Qi 补气

Ingredients5 herbs

HerbDosageWhat it does in this formula

人Ren Shen人参切，去顶Ginseng Radix6gPowerfully augments the source qi of Spleen and Stomach 茯Fu Ling茯苓去皮Poria6gLeaches out damp so the Spleen is not burdened 白Bai Zhu白术Atractylodis Macrocephalae Rhizoma6gStrengthens the Spleen and dries the damp that weakness produces 陈Chen Pi陈皮锉Citri Reticulatae Pericarpium6gMoves qi and dissolves fullness so the tonic herbs do not stagnate 甘Zhi Gan Cao甘草Glycyrrhizae Radix Praeparata6gAugments qi in the middle and harmonizes the other herbs

Indications

Augments qi, strengthens the SpleenRegulates qi, harmonizes the StomachTonifies without causing stagnation

Spleen and Stomach qi deficiency with qi stagnation. The transporting function is too weak to move what is eaten, so food sits and the middle burner feels blocked as well as empty.

Clinical Manifestations

Poor appetite with fullness after meals
Loose stool in a weak digestion
Vomiting or nausea in children with chronic weak digestion
Fatigue after long illness with a distended abdomen

TonguePale with a thin white coating

PulseThin and moderate, or weak

Health Categories

Digestive HealthEnergy & Fatigue

Modern Applications

Functional dyspepsia Chronic diarrhea Failure to thrive Poor appetite Post-illness fatigue

Common adjustments

Marked nausea and copious thin phlegm — add Ban Xia 半夏 — the formula then becomes Liu Jun Zi Tang
Cold in the middle with abdominal pain relieved by warmth — add Gan Jiang 干姜
Food stagnation with sour belching — add Shan Zha 山楂 and Shen Qu 神曲

Contraindications

Not for fullness and poor appetite caused by damp-heat, food accumulation or Stomach yin deficiency — a sweet warming tonic makes those worse.

For licensed practitioners’ reference only — not a self-treatment guide.

Pregnancy

Generally compatible in pregnancy at ordinary doses — it is a mild Spleen tonic. Use under the guidance of the treating practitioner.

Related Formulas

References

Source Xiao Er Yao Zheng Zhi Jue 《小儿药证直诀》 · Northern Song

「温中和气，治吐泻，不思乳食。」
— 《小儿药证直诀》(classical source, public domain)

Classical source (public domain), cited in the source-quote section.
2. Scheid, Bensky, Ellis & Barolet. Chinese Herbal Medicine: Formulas & Strategies, 2nd ed. — composition & dosage cross-checked.
3. 《方剂学》（全国中医药行业高等教育规划教材）— pattern analysis cross-checked.

Professional reference notice. Entries are scholarly references for licensed TCM practitioners and students — not medical advice, and not a recommendation to self-prescribe. Chinese herbal formulas should be used under the guidance of a qualified practitioner. Content is an original editorial compilation by Cura x Cura, cross-checked against the cited references.