Wu Mei Wan (乌梅丸): The Black Plum Pill — Zhang Zhongjing's Formula for Cold-Heat Complex and Chronic Diarrhea

What Is Wu Mei Wan?

Wu Mei Wan (乌梅丸), the “Black Plum Pill,” is one of the most complex and fascinating formulas in Zhang Zhongjing’s Shang Han Lun (伤寒论, circa 200 CE). It is the representative formula for Jue Yin disease (厥阴病) — the deepest, final stage of the Six Divisions, where the body’s Yin and Yang are locked in a struggle and cold-heat symptoms coexist in paradoxical confusion.

The formula is named after its chief herb, Wu Mei (乌梅, smoked plum / mume), which is used here for its intensely sour and astringent properties. Sour has a special relationship with roundworms in TCM theory — worms are said to “dislike sour and like sweet” (蛔得酸则静), so the extremely sour Wu Mei quiets the parasites while the other herbs address the underlying cold-heat imbalance.

What makes Wu Mei Wan remarkable is its bold combination of warming and cooling herbs in the same formula — a strategy that seems contradictory until you understand the cold-heat complex pattern it treats. In modern practice, this formula has found new life treating chronic digestive disorders where symptoms contradict each other: diarrhea with heat signs, or cold limbs with irritability.

The Ingredients

Herb	Chinese	Dose (approx.)	Role
Smoked Plum	Wu Mei (乌梅)	30 pieces	Chief — extremely sour; quiets roundworms, astringes leakage
Coptis	Huang Lian (黄连)	6g	Deputy — clears heat, dries dampness (upper burner heat)
Phellodendron	Huang Bo (黄柏)	6g	Deputy — clears heat, dries dampness (lower burner heat)
Aconite (prepared)	Fu Zi (附子)	6g	Deputy — warms Yang, rescues cold
Cinnamon bark	Gui Zhi (桂枝)	6g	Deputy — warms and unblocks, releases exterior
Asarum	Xi Xin (细辛)	6g	Deputy — warms, disperses cold, reaches the deepest channels
Dried ginger	Gan Jiang (干姜)	10g	Deputy — warms the middle, restores Spleen Yang
Angelica	Dang Gui (当归)	4g	Assistant — nourishes blood, prevents damage from heat-clearing
Ginseng	Ren Shen (人参)	6g	Assistant — tonifies Qi, supports the upright Qi
Cnidium	Chuan Xiong (川芎)	4g	Assistant — moves blood (some versions omit)

Note: Some classical versions substitute Shu Jiao (Sichuan pepper) for Chuan Xiong. The exact composition varies slightly across editions.

Understanding the Architecture

Wu Mei Wan has a unique three-layer structure:

1. The Sour Anchor: Wu Mei — the overwhelming sour taste astringes, quiets, and consolidates
2. The Cooling Team: Huang Lian + Huang Bo — clear heat from both upper and lower burners
3. The Warming Team: Fu Zi + Gui Jiang + Xi Xin + Gan Jiang — warm the cold, rescue Yang, reach the deepest channels
4. The Support: Ren Shen + Dang Gui — tonify Qi and Blood so the warming and cooling herbs don’t deplete the patient

How It Works

Wu Mei Wan treats the pattern of cold-heat complex with Jue Yin disharmony (寒热错杂，厥阴病):

Chronic disease reaches the deepest level (Jue Yin)
  → Yin and Yang are in conflict
    → Upper body shows heat signs (irritability, red tongue, vomiting)
    → Lower body shows cold signs (diarrhea, cold limbs, abdominal pain)
      → Or: roundworms are driven by heat upward but the body is cold below
        → Paradoxical, contradictory symptoms

The formula’s genius lies in treating both cold and heat simultaneously while the sour Wu Mei anchors the entire treatment:

• Sour anchors and quiets — Wu Mei stops the upward rebellion and quiets parasites
• Cold herbs clear the heat — Huang Lian and Huang Bo address the heat component
• Hot herbs warm the cold — Fu Zi, Gan Jiang, Gui Jiang, Xi Xin address the cold component
• Tonifying herbs protect — Ren Shen and Dang Bei prevent the intense treatment from depleting the patient

Primary Uses

1. Chronic Diarrhea with Cold-Heat Complex (寒热错杂久泻)

The most common modern application:

• Chronic diarrhea that alternates with normal or constipated stools
• Abdominal pain that is sometimes better with warmth, sometimes not
• Cold hands and feet but a red tongue tip
• Diarrhea with mucus or blood mixed in
• Fatigue and weakness with irritability

2. Irritable Bowel Syndrome (IBS)

• Alternating diarrhea and constipation
• Abdominal pain and bloating
• Symptoms triggered by stress or cold food
• Cold-heat contradiction in the presentation

3. Ulcerative Colitis

• Chronic bloody diarrhea
• Abdominal pain with tenesmus (urge to stool)
• Cold limbs with inflammatory heat in the gut
• The cold-heat complex is very common in this condition

4. Biliary Ascariasis (胆道蛔虫症)

The original classical indication:

• Severe, colicky upper abdominal pain
• Vomiting, possibly of roundworms
• Pain that is paroxysmal — “comes and goes”
• Patient is restless and irritable
• Cold extremities during pain attacks

5. Chronic Gastritis with Mixed Pattern

• Upper abdominal discomfort with both heat (acid reflux, burning) and cold (cold food aggravates) signs
• Nausea with vomiting of sour fluid
• The stomach wants warmth but also has heat inflammation

Diagnostic Indicators

Sign	Typical Finding
Diarrhea	Chronic, possibly with mucus or blood
Pain	Abdominal, sometimes better with warmth, sometimes not
Extremities	Cold — “Jue” (厥) means cold reversal
Tongue	Red tip (heat above) with pale body (cold below)
Pulse	Fine (xi), may be slightly rapid
Mood	Irritable, restless, “hot temper with cold body”

The Jue Yin Stage — Deepest Level

In the Six Divisions (六经) of the Shang Han Lun, Jue Yin is the deepest and most complex stage:

Stage	Location	Nature
Tai Yang	Exterior	Cold invasion — simplest
Yang Ming	Interior	Heat accumulation
Shao Yang	Half-exterior, half-interior	Alternating symptoms
Tai Yin	Spleen	Cold-dampness
Shao Yin	Heart/Kidney	Yin-Yang collapse
Jue Yin	Liver/Pericardium	Cold-heat complex — most complex

Wu Mei Wan is the only formula specifically for Jue Yin disease in the Shang Han Lun. It handles the paradox that defines this stage: simultaneous cold and heat, upper heat and lower cold, the body fighting itself.

Modern Clinical Applications

Condition	How It Fits the Pattern
Chronic IBS-D	Alternating diarrhea/constipation with cold-heat mix
Ulcerative colitis	Inflammatory heat + Spleen Yang deficiency cold
Crohn’s disease	Similar cold-heat complexity
Chronic gastritis	Heat inflammation + cold middle burner
Functional dyspepsia	Mixed hot-cold digestive symptoms
Post-antibiotic dysbiosis	Damaged gut flora with contradictory symptoms
Intestinal parasites	The original classical use

Dosage and Preparation

As Pills (Traditional)

The name “Wan” (丸) indicates this was originally formulated as pills:

• All herbs are ground to powder and formed into pills with honey
• This makes the formula suitable for long-term administration
• The pill form also moderates the intensity of the warming and cooling herbs

As Decoction (Modern)

• Simmer all herbs together for 30–40 minutes
• Wu Mei should be added in full amount — the sour taste is essential
• Take warm, twice daily
• Some modern practitioners adjust the warming/cooling ratio based on the patient’s specific cold-heat balance

Granule Form

6–9g dissolved in warm water, twice daily.

Comparison with Related Formulas

Formula	Pattern	Key Feature
Wu Mei Wan	Cold-heat complex, Jue Yin	Sour anchor + both warming and cooling herbs
Ban Xia Xie Xin Tang	Cold-heat in middle burner	Also mixed warming/cooling, but simpler pattern
Huang Lian Jie Du Tang	Pure heat, all four heat levels	No warming herbs — pure heat clearing
Li Zhong Tang	Pure cold in the middle	No cooling herbs — pure warming
Shen Ling Bai Zhu San	Spleen deficiency with dampness	Gentle, tonifying — no cold-heat paradox

Precautions

Situation	Guidance
Pure heat pattern	The warming herbs will worsen — use Huang Lian Jie Du Tang instead
Pure cold pattern	The cooling herbs will worsen — use Li Zhong Tang instead
Pregnancy	Contains Fu Zi and Xi Xin — professional supervision only
Acute infection	Address the acute condition first
Yin deficiency with dryness	The warming herbs may further damage Yin

Key Takeaways

• Wu Mei Wan is the Jue Yin formula — for the deepest, most complex stage of disease
• Treats the cold-heat complex — paradoxical symptoms where hot and cold coexist
• Named after Wu Mei (smoked plum) — the intense sour taste quiets roundworms and astringes leakage
• Originally for roundworm-driven colicky pain, now primarily used for chronic digestive disorders
• Uniquely combines warming and cooling herbs in the same formula
• Highly relevant for modern conditions: IBS, ulcerative colitis, chronic gastritis
• The pill form is traditional — designed for long-term use in chronic conditions

Disclaimer: This article is for educational purposes only. Consult a licensed TCM practitioner for personalized formula prescriptions.

Related Articles

• Huang Lian: Coptis in TCM
• Ban Xia Xie Xin Tang: Pinellia Heart-Draining Decoction
• TCM Digestive Health
• TCM Six Divisions