Long Dan Xie Gan Tang: Gentiana Drain the Liver Decoction for Fire and Damp-Heat
Explore Long Dan Xie Gan Tang (龙胆泻肝汤), one of TCM's most powerful formulas for draining Liver fire and Liver-gallbladder damp-heat — used for migraines, red eyes, ear infections, genital itching, and inflammatory conditions.
What is Long Dan Xie Gan Tang?
Long Dan Xie Gan Tang (龙胆泻肝汤), “Gentiana Drain the Liver Decoction,” is one of the most potent formulas in the TCM pharmacopeia for draining fire and damp-heat from the Liver and Gallbladder channels. It first appeared in the Yi Fang Ji Jie (Explanation of Collected Formulas) by Wang Ang during the Qing Dynasty, though its roots trace to earlier works.
The formula is named after its chief herb, Long Dan Cao (Gentian), one of the most bitter and cold herbs in TCM — and its job is precisely what the name suggests: to forcefully drain (泻) the Liver (肝).
The Ingredients
| Herb | Chinese | Role |
|---|---|---|
| Long Dan Cao (Gentian) | 龙胆草 | Drains Liver fire, clears damp-heat (sovereign herb) |
| Huang Qin (Scutellaria) | 黄芩 | Clears heat, dries dampness (upper/middle jiao) |
| Zhi Zi (Gardenia) | 栀子 | Clears heat in all three jiaos, drains damp-heat |
| Mu Tong (Akebia) | 木通 | Drains damp-heat through urination |
| Ze Xie (Alisma) | 泽泻 | Promotes urination, drains damp-heat |
| Chai Hu (Bupleurum) | 柴胡 | Soothes Liver Qi, guides the formula to the Liver channel |
| Sheng Di Huang (Raw Rehmannia) | 生地黄 | Protects Yin from the harsh draining herbs |
| Dang Gui (Dong Quai) | 当归 | Nourishes Blood, prevents damage from the cold-bitter herbs |
| Che Qian Zi (Plantago) | 车前子 | Drains damp-heat through urination |
| Gan Cao (Licorice) | 甘草 | Harmonizes the formula, protects the Stomach |
How It Works
Long Dan Xie Gan Tang addresses a powerful pattern: Liver and Gallbladder fire and damp-heat blazing upward and/or pouring downward.
The Pathology
Emotional stress, rich diet, alcohol
→ Liver Qi stagnation → generates Fire
→ Fire combines with Dampness (from Spleen weakness or diet)
→ Damp-Heat in Liver/Gallbladder channels
→ Heat rises: headache, red eyes, ear ringing, bitter taste
→ Damp pours down: genital itching, discharge, urinary burningThe Strategy
The formula uses a three-pronged approach:
- Drain fire aggressively — Long Dan Cao, Huang Qin, Zhi Zi are all bitter-cold and powerfully heat-clearing
- Drain damp-heat through urination — Mu Tong, Ze Xie, Che Qian Zi give the dampness an exit route
- Protect the upright Qi — Sheng Di Huang and Dang Gui prevent the harsh herbs from damaging Blood and Yin; Chai Hu guides the formula to the Liver
Primary Uses
1. Liver Fire Rising Upward
- Severe headaches — especially at the temples or sides of the head (Gallbladder channel)
- Red, bloodshot eyes with a burning sensation
- Bitter taste in the mouth, especially in the morning
- Irritability and anger — out of proportion to the situation
- Tinnitus — loud, roaring type (not the faint ringing of deficiency)
- Ear infections — acute, painful, with discharge
2. Damp-Heat Pouring Downward
- Genital itching, redness, and swelling — including herpes outbreaks, eczema in the groin
- Vaginal discharge — yellow, thick, foul-smelling
- Urinary tract infections — burning urination, urgency, dark urine
- Scrotal swelling or itching — damp-heat settling in the lower body
3. Liver Fire with Hypertension
- High blood pressure with a red face, anger, and pounding headaches
- The type of hypertension that worsens with stress
- Not suitable for all hypertension — only the excess fire type
4. Other Applications
- Acute conjunctivitis (red eye)
- Acute otitis media (middle ear infection)
- Herpes zoster (shingles) in the rib or flank area (Liver/Gallbladder channel territory)
- Acute pelvic inflammatory disease
- Eczema and skin conditions with damp-heat signs in the lower body
Dosage and Forms
Traditional Decoction
Simmer all herbs (except Che Qian Zi, which should be wrapped in cloth) for 20-30 minutes. Drink warm, typically 2 times daily.
Modern Forms
- Patent pills: Available as Long Dan Xie Gan Wan — convenient but milder
- Granules: 6-9g dissolved in warm water, twice daily
- Decoction: Strongest form, used for acute conditions
Duration
This is a short-term formula — typically used for 1-3 weeks during an acute flare. It is not meant for long-term use because the bitter-cold herbs can damage the Spleen and Stomach.
Common Modifications
| Modification | Add | For |
|---|---|---|
| Severe headache | Man Jing Zi, Ju Hua | Target head and eyes |
| Constipation with heat | Da Huang | Purge heat through the bowels |
| More dampness than heat | Cang Zhu, Huang Bo | Enhance damp-drying |
| Blood in urine | Xiao Ji, Bai Mao Gen | Stop bleeding, clear heat |
| Severe eye redness | Xia Ku Cao, Jue Ming Zi | Focus on the eyes |
Safety and Historical Note
Long Dan Xie Gan Tang has an important safety history:
- The original formula contained Guan Mu Tong (关木通, Aristolochia manshuriensis), which contains aristolochic acid — a nephrotoxic and carcinogenic compound
- Modern versions must use Chuan Mu Tong (川木通, Clematis species) or Bai Mu Tong (白木通, Akebia trifoliata) instead
- This substitution is now standard practice and legally required in China and many other countries
- When purchasing this formula, ensure the Mu Tong source is Akebia or Clematis, not Aristolochia
Precautions and Contraindications
- Spleen/Stomach deficiency with cold signs — the formula is extremely bitter and cold; it will worsen digestive weakness
- Liver Yin or Blood deficiency without genuine excess fire — draining fire from a deficient Liver will make the deficiency worse
- Pregnancy — contraindicated due to the strong draining herbs
- Long-term use — damages Spleen and Stomach; use only for acute episodes
- Elderly or frail patients — use with extreme caution or choose a gentler alternative
Comparison with Related Formulas
| Formula | Key Difference |
|---|---|
| Long Dan Xie Gan Tang | Strongest — drains fire AND damp-heat from Liver/Gallbladder |
| Xiao Yao San | Much gentler — soothes Liver Qi and tonifies Spleen; for stagnation without strong fire |
| Dan Zhi Xiao Yao San | Moderate — adds heat-clearing to Xiao Yao San; for milder fire with stagnation |
| Huang Lian Jie Du Tang | Clears fire in all three jiaos; not specific to Liver/Gallbladder |
| Long Dan Xie Gan Tang vs. Qing Hao Bie Jia Tang | Long Dan is for excess fire; Qing Hao is for deficiency heat (Yin deficiency) |
Summary
Long Dan Xie Gan Tang is the heavy artillery of Liver fire and damp-heat treatment. It is powerful, fast-acting, and effective — but must be used precisely and for short durations. When the pattern matches (excess fire, damp-heat, robust constitution), the results can be dramatic. When the pattern doesn’t match, it can cause harm. This is a formula that demands respect for its strength.
Related Reading
FAQ
Who is this article for?
Readers who want a practical, beginner-friendly understanding of this TCM formula and when it is used.
Can this article replace professional medical advice?
No. This content is educational only and does not replace diagnosis or treatment from a qualified healthcare professional.
Disclaimer
This content is for educational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional for diagnosis and treatment.