In TCM’s taxonomy of Yin-supplementing formulas, Liu Wei Di Huang Wan (Six-Ingredient Rehmannia Pill) is the foundational Kidney-Yin tonic. From this base, subsequent physicians developed specialised variations by adding two additional herbs to address specific organ-level deficiencies. Zhi Bai Di Huang Wan adds Zhi Mu and Huang Bai to target Kidney-Yin deficiency with pronounced deficiency-Fire. Mai Wei Di Huang Wan (Ophiopogon-Schisandra Rehmannia Pill) takes a different direction: it adds Mai Dong (Ophiopogon) and Wu Wei Zi (Schisandra) to the Liu Wei Di Huang base to simultaneously supplement Lung Yin and astringe-consolidate, achieving what the formula’s classical indication describes as jin shui xiang sheng — “Metal and Water generating each other.” First recorded by Qing Dynasty physician Zhang Lu in Zhang Shi Yi Tong for lao sou (consumptive cough), it targets the clinical pattern where Kidney-Yin depletion has led to Lung-Yin failure: dry cough, breathlessness, night sweats, lower back soreness, and tinnitus all present together. The formula has since become one of the most widely used TCM preparations for chronic respiratory conditions, menopausal syndrome, and other Lung-Kidney Yin-deficient presentations.

I. Historical Development and the Jin Shui Xiang Sheng Principle

Zhang Lu’s rationale for adding Mai Dong and Wu Wei Zi to Liu Wei Di Huang Wan is grounded in the classical Five-Elements model: the Lung belongs to Metal; the Kidney belongs to Water. In the generation cycle, Metal generates Water (Lung generates Kidney) — but crucially, the cycle is bidirectional in clinical reality: when Kidney Water is deficient, Lung Metal’s function is impaired because its generative substrate is depleted. This is the pathomechanism of “water not nourishing metal” (shui bu han jin), producing the characteristic Lung-Kidney Yin-deficiency presentation. Mai Wei Di Huang Wan’s design restores the generation cycle: the Liu Wei base fills the Kidney-Water reservoir; Mai Dong and Wu Wei Zi nourish and consolidate Lung-Metal directly — two-organ intervention ensuring the cycle restores.

Subsequently included in Yi Ji and achieving widespread clinical adoption, it is now available in multiple dosage forms (water-honey pills, small honey pills, large honey pills, concentrated pills, granules) and remains one of the most commonly prescribed Chinese patent medicines for chronic respiratory and constitutional Yin-deficiency conditions.

II. Eight-Herb Composition: “Three Supplementing, Three Draining, Plus Two Moistening-Consolidating”

The formula’s eight herbs operate as three layers: Liu Wei Di Huang Wan’s Six-Herb framework (three supplementing + three draining), plus the two additions (moisten Lung + consolidate Qi-Essence).

Layer 1: Three Supplementing (Liu Wei base — Kidney-Yin root treatment)

• Shu Di Huang 24g (Chief): sweet, slightly warm; enters Liver, Kidney. Nourishes Yin and supplements Blood, fills Jing-Essence and supplements the marrow. The Kidney-Yin root supplementer: fills the depleted Kidney reservoir from which Lung-Yin derives its sustenance. The formula’s highest dose reflects its primacy — all other actions depend on the Kidney-Yin being adequately filled.
• Shan Zhu Yu 12g: sour-astringent, slightly warm; enters Liver, Kidney. Supplements Liver and Kidney, astringes Jing-Essence. Paired with Shu Di: supplements while consolidating — prevents the Kidney-Yin just restored by Shu Di from immediately leaking out as night sweats, excessive urination, or seminal loss. Its astringent quality also assists Wu Wei Zi (below) in consolidating Lung-Qi.
• Shan Yao 12g: sweet, neutral; enters Spleen, Lung, Kidney. Supplements Spleen-Qi and Lung-Kidney Yin, stabilises Jing. Shan Yao provides a critical bridge: it simultaneously supplements the Spleen (the source of fluid generation — pei tu sheng jin), nourishes the Kidney, and directly nourishes Lung-Yin. This three-organ action makes it indispensable in this Lung-Kidney formula.

Layer 2: Three Draining (Liu Wei base — prevent cloying and clear deficiency-turbidity)

• Fu Ling 9g: sweet-bland, neutral; promotes urination and percolates Damp, strengthens Spleen and calms Spirit. Counterbalances Shu Di’s cloying tendency; strengthens Spleen-Stomach to prevent the formula’s supplementing herbs from creating Phlegm-Damp accumulation.
• Mu Dan Pi 9g: bitter-pungent, slightly cold; clears Heat and cools Blood, activates Blood and disperses Stasis. Counterbalances Shan Zhu Yu’s warm-astringent tendency; clears the deficiency-Heat generated by Yin insufficiency, addressing the tidal fever, hot palms, and night sweat components of the target pattern. In the Mai Wei context, it also moderates Wu Wei Zi and Shan Zhu Yu from over-consolidating.
• Ze Xie 9g: sweet-bland, cold; promotes urination and drains Heat, leaches out Kidney Damp-turbidity. Counterbalances Shu Di’s cloying tendency by opening the Kidney’s drainage pathway; prevents supplementing from trapping Damp-turbidity. Together with Fu Ling and Mu Dan Pi, the “three draining” herbs ensure the formula supplements without stagnating, clears without damaging.

Layer 3: Two Additions (Lung-specific supplementing and consolidating)

• Mai Dong 9g: sweet-slightly cold; enters Lung, Stomach, Heart. Nourishes Lung Yin and clears Lung Heat, generates fluids and calms Spirit. Mai Dong is the formula’s direct Lung intervention — while the Liu Wei base fills Kidney-Water from below, Mai Dong nourishes Lung-Metal from above. Together they restore the Jin-Shui generation cycle from both ends. Its Heart-calming quality also addresses the insomnia and restlessness that commonly accompany Lung-Kidney Yin-deficiency presentations.
• Wu Wei Zi 9g: sour-sweet, warm; enters Lung, Heart, Kidney. Consolidates and astringes (especially Lung-Qi), supplements Qi and generates fluids, calms Spirit. Wu Wei Zi’s role in this formula: (1) consolidates Lung-Qi to stop the persistent cough that Lung-Yin deficiency generates; (2) astringes Kidney-Jing to stop the night sweats, seminal loss, and excessive urination that Kidney-Yin deficiency drives; (3) pairs with Mai Dong as the classical one moistens, one astringes combination — Mai Dong opens and nourishes the desiccated Lung mucosal tissue; Wu Wei Zi closes and consolidates the Lung Qi that has been leaking outward as persistent cough. Together they implement the opening-and-closing (开合) mechanism for Lung restoration.

Overall formula logic — three principles:
① Fill Kidney-Water reservoir from below, nourish Lung-Metal from above: Shu Di, Shan Zhu Yu, Shan Yao fill Kidney Yin; Mai Dong nourishes Lung Yin — restoring the Jin-Shui generation cycle from both origins
② Supplement while draining, nourish while consolidating: Fu Ling, Ze Xie, Mu Dan Pi drain turbidity and clear deficiency-Heat, ensuring the supplementing herbs don’t create stagnation or worsen deficiency-Fire
③ Moisten and consolidate Lung-Qi: Mai Dong opens-moistens; Wu Wei Zi closes-consolidates — together they normalise Lung-Qi’s ascending-descending function and stop both the dry cough and the Qi-leakage

III. Formula Differentials — When to Choose Mai Wei Di Huang Wan vs Related Formulas

IV. Clinical Applications and Modifications

Core pattern: Lung-Kidney Yin deficiency (Jin Shui both deficient)
Chronic dry cough with minimal or absent sputum (or small amounts of sticky, difficult-to-expectorate phlegm); breathlessness on exertion; hoarse voice; lumbar and knee soreness and weakness; dizziness and tinnitus; tidal Heat and night sweats; dry mouth and throat; pale-red or red tongue with scant coating; thin-rapid pulse.

1. Chronic respiratory disease (COPD stable phase, chronic bronchitis, bronchiectasis in remission): Lung-Kidney Yin-deficiency is the fundamental constitutional pattern driving persistent dyspnoea and cough in chronic lung disease. Mai Wei Di Huang Wan addresses the constitutional root while providing immediate symptomatic relief of dry cough and breathlessness. Modifications: dyspnoea prominent → add Dong Chong Xia Cao 3g; profuse phlegm despite Yin deficiency → add Ban Xia 9g, Fu Ling increase; cough with blood → use Bai He Gu Jin Wan instead or add Han Lian Cao 10g.

2. Asthma (non-acute, Lung-Kidney deficiency type): long-standing asthma with Kidney-Qi deficiency underlying — the Kidney’s receiving Qi function (腎气) is impaired. Modifications: add Bu Gu Zhi 12g, Hu Tao Ren 15g — warm Kidney-Yang to assist receiving Qi; for Lung-Kidney Qi-Yin dual deficiency: add Dang Shen 15g.

3. Menopausal syndrome (Yin-deficiency type): hot flushes, night sweats, dry mouth, insomnia, tinnitus, lumbar soreness — Kidney-Yin deficiency failing to nourish Lung and Heart. Mai Wei Di Huang Wan provides both Kidney-Yin supplementation (through the Liu Wei base) and direct symptom relief (Mai Dong calms Heart, Wu Wei Zi consolidates against sweating). Modifications: prominent insomnia → add Suan Zao Ren 15g, Long Gu 20g; emotional instability → add Bai He 20g.

4. Type 2 diabetes (Yin-deficiency type, adjunctive): Kidney-Yin deficiency underlying the xia xiao (lower wasting) component of diabetic thirst-polyuria. Critical note: adjunctive use only; never replace antidiabetic medication. Modifications: add Ge Gen 15g, Tian Hua Fen 12g — generate fluids and clear Heat; Qi-deficiency prominent → add Huang Qi 20g.

5. Post-illness and post-chemotherapy Lung-Kidney depletion: constitutional Lung-Kidney depletion after prolonged febrile illness, tuberculosis treatment, or chemotherapy — dry cough, fatigue, night sweats, lumbar weakness. Gentle long-term constitutional restoration.

Common modifications:

• Breathlessness severe (Kidney not receiving Qi): add Bu Gu Zhi 12g, Hu Tao Ren 15g, Dong Chong Xia Cao 3g
• Blood-tinged sputum or haemoptysis: add Han Lian Cao 10g, Bai Mao Gen 15g; consider switching to Bai He Gu Jin Wan
• Deficiency-Fire marked (hot palms, night sweats, red tongue): add Zhi Mu 10g, Huang Bai 9g; consider Zhi Bai Di Huang Wan instead
• Night sweats prominent: increase Wu Wei Zi to 12g; add Fu Xiao Mai 30g, Mu Li 20g
• Insomnia and palpitations: add Suan Zao Ren 15g, Long Gu 20g
• Qi deficiency co-pattern (fatigue, breathlessness, spontaneous sweating): add Dang Shen 15g, Huang Qi 20g

V. Usage, Dosage, and Safety

Available forms: water-honey pill (6g twice daily); small honey pill (9g twice daily); concentrated pill (8 pills twice daily); granules. Patent form: Hai Tian Mai Wei Di Huang granules. Take with warm water after meals. Suitable for prolonged use (1–3+ months).

Contraindications: active exterior illness (fever, chills, sore throat) — stop supplementing during exterior-pathogen illness; Spleen-Stomach Cold deficiency with loose stool (Shu Di and Mai Dong’s moistening nature will worsen Damp-Cold; reduce dose or stop); Phlegm-Damp cough (white copious phlegm, greasy coating — the formula’s moistening herbs will worsen Phlegm; use expectorant-drying formulas instead); allergy to any component; diabetes patients — adjunctive use only, do not discontinue antidiabetic medication.

Lifestyle and dietary support: avoid spicy, oily, and drying foods; avoid smoking and passive smoke exposure (directly destroys Lung-Yin); prioritise adequate sleep; avoid overexertion; foods supporting the formula’s action: snow pear, lily bulb, silver ear (Tremella), lotus root, yam, black sesame, wolfberry, walnuts.