What is Long Dan Xie Gan Tang?

Long Dan Xie Gan Tang is one of the most well-known classical formulas in Traditional Chinese Medicine, first recorded in the Li Dongyuan's 'Lan Shi Mi Cang' (Secrets from the Orchid Chamber) during the Jin-Yuan dynasty period and later popularized in the Qing dynasty. It is a multi-herb decoction designed to drain excess fire and damp-heat from the liver and gallbladder organ systems, as understood in TCM. The formula typically contains 10–11 herbs that work together to reduce inflammation, support urinary drainage, and calm what TCM practitioners describe as 'liver fire rising.'

How does Long Dan Xie Gan Tang work?

From a modern pharmacological view, the formula's key herbs work through several overlapping pathways: Gentiana scabra contains iridoid glycosides (gentiopicrin, swertiamarin) with demonstrated anti-inflammatory and antimicrobial activity; Scutellaria baicalensis provides baicalin, a potent flavonoid that inhibits inflammatory cytokines; and Rehmannia and Alisma together support diuretic activity and renal clearance. Together, these herbs help reduce local inflammation in urinary and hepatic tissues, support immune response, and promote fluid excretion that helps flush pathogens from the urinary tract. The formula is not a single-compound treatment — its power lies in the synergy of its constituent herbs acting on overlapping targets.

What forms does Long Dan Xie Gan Tang come in?

The traditional form is a water-boiled decoction consumed as a tea, which offers the most complete extraction of water-soluble actives. Modern patent pills (Wan) are the most convenient and widely used form globally. Concentrated granules dissolve in hot water and closely replicate the decoction. Capsule and liquid extract forms are also available; quality varies significantly by brand. Always choose products from manufacturers who explicitly verify the absence of aristolochic acid-containing herbs (i.e., confirm safe Mu Tong substitution with Clematis armandii or removal from formula).

Where it comes from:

Long Dan Xie Gan Tang dates to at least the 13th century CE in Chinese medical literature and has been in continuous clinical use for over 700 years. It remains one of the most prescribed formulas in TCM clinics across China, Taiwan, Japan (as Ryutan Shakan-to), and Korea for conditions classified under liver-gallbladder damp-heat — a category that overlaps substantially with modern diagnoses of UTIs, pelvic inflammatory disease, herpes outbreaks, and ear and eye infections. A major safety controversy emerged in the late 1990s–early 2000s when some Taiwanese patent medicine manufacturers were found to have used aristolochic acid-containing Aristolochia plants mislabeled as Mu Tong, leading to cases of aristolochic acid nephropathy. Reputable manufacturers have since reformulated.

What does Long Dan Xie Gan Tang help with?

• Urinary tract infections (UTIs): This is the formula's most widely studied modern application. The diuretic herbs promote urinary flow to help flush bacteria, while anti-inflammatory and antimicrobial compounds from Gentiana and Scutellaria help reduce bladder and urethral irritation. Clinical use in China and Taiwan supports its use alongside or instead of antibiotics for mild-to-moderate uncomplicated UTIs.
• Pelvic inflammatory disease: TCM classifies pelvic inflammation as damp-heat in the lower jiao, and this formula is frequently prescribed for lower pelvic pain, vaginal discharge, and inflammation of reproductive organs. Its anti-inflammatory herb combination helps reduce local tissue inflammation and supports the body's immune response to pelvic pathogens.
• Genital herpes outbreaks: Several of the formula's herbs — particularly Scutellaria (baicalin) and Gentiana — have shown antiviral activity against herpes simplex virus in laboratory and some clinical research. Practitioners use it during active outbreaks to reduce severity, duration, and associated pain and inflammation.
• Ear infections and acute otitis: Ear infections involving pain, swelling, and discharge are classified in TCM as liver-gallbladder fire rising to the sensory orifices. The formula's cooling and anti-inflammatory herbs are used to reduce ear pain and swelling, with clinical case series from Chinese hospitals supporting its use in acute otitis media and externa.
• Red, irritated eyes (conjunctivitis): Eye redness, discharge, and irritation fall under the TCM concept of liver fire affecting the eyes. The formula's combination of Gardenia, Scutellaria, and Gentiana helps calm eye inflammation. It is commonly used in TCM ophthalmology alongside topical treatments for acute conjunctivitis.
• Vaginal yeast and bacterial infections: The formula's anti-inflammatory, antifungal, and antimicrobial constituent herbs help address vaginal infections characterized by discharge, itching, and odor. Scutellaria's baicalin has documented antifungal properties against Candida species, and the diuretic component helps clear damp accumulation in the lower body.
• Liver and gallbladder inflammation: Gentiana, Bupleurum, and Gardenia all have hepatoprotective research behind them as individual herbs. Together, the formula is used in integrative oncology and hepatology settings in China to support liver function during hepatitis and to reduce elevated liver enzymes associated with early liver inflammation.
• Eczema and skin rashes (damp-heat type): Skin conditions with redness, weeping, heat, and itching are mapped to damp-heat in TCM. The formula's systemic cooling and anti-inflammatory effects make it a common choice for flare-ups of contact dermatitis, eczema, and other inflammatory skin conditions — particularly those affecting the lower body or groin area.
• Anxiety with irritability and headache: When anxiety presents with physical symptoms like temporal headaches, flushed face, bitter taste, and irritability, TCM identifies this as liver fire. The formula's calming, heat-clearing herbs help moderate the nervous system's stress response, and Scutellaria's baicalin has mild anxiolytic properties supported by some clinical data.
• Shingles (herpes zoster) pain: Herpes zoster outbreaks along the rib or abdominal region are traditionally treated with this formula in TCM, as the affected channels correspond to the liver and gallbladder. The combination of antiviral and anti-inflammatory herbs helps reduce outbreak severity and the burning nerve pain associated with shingles.

What can Long Dan Xie Gan Tang help prevent?

• Recurrent UTI episodes when used as a short-term preventive course between infections
• Escalation of mild hepatic inflammation when used early in liver stress conditions

Which foods are rich in Long Dan Xie Gan Tang?

Long Dan Xie Gan Tang is a prepared herbal formula, not a food-derived compound. However, the dietary pattern that best supports its goals — clearing damp-heat, reducing inflammation, and supporting liver and urinary health — emphasizes: (1) Bitter greens like dandelion, arugula, and radicchio, which support liver bile flow and mild detoxification; (2) Cooling foods such as cucumber, watermelon, celery, and mung beans, which help reduce systemic heat and support urinary flushing in TCM dietary therapy; (3) Fermented foods like plain yogurt and kefir to support gut and vaginal microbiome health during and after any infection treatment; (4) Cranberry juice (unsweetened) for UTI prevention through its anti-adhesion effect on urinary bacteria; (5) Garlic and turmeric for their broad anti-inflammatory and antimicrobial support. Foods to minimize while using this formula: alcohol, fried and greasy foods, red meat in excess, spicy foods, and refined sugars — all considered damp-heat-generating in TCM and all with some modern anti-inflammatory rationale for avoidance during active infections.

What are the side effects of Long Dan Xie Gan Tang?

• Digestive upset: nausea, loose stools, or stomach cramping (most common, especially on an empty stomach)
• Decreased appetite from prolonged use
• Fatigue or cold sensation if used beyond 2–4 weeks (formula is energetically cold)
• Kidney damage: historical risk from aristolochic acid-containing products; choose verified safe products only
• Allergic reaction: rare but possible with any multi-herb formula
• Electrolyte imbalance with long-term use due to diuretic herbs
• Not recommended during pregnancy: several herbs (Dang Gui, strong diuretics) may affect uterine tone

Good to know:

When sourced from reputable manufacturers who have removed or safely substituted aristolochic acid-containing herbs, Long Dan Xie Gan Tang is generally safe for short-term use. The most critical safety concern historically was aristolochic acid contamination from improperly sourced Mu Tong, which caused progressive kidney damage in some users. Always verify your product's safety certificate. This formula is bitter, cold, and drying by nature — not suitable for long-term use or for people who run cold, are fatigued, or have weak digestion.

How much Long Dan Xie Gan Tang should you take?

• Recommended daily: Traditional decoction: 1 full formula dose (approximately 9–15g of dry herb total) boiled in water, taken in 2 divided portions. Patent pill form: typically 8 pills (standard 200mg pills) 3 times daily, or per manufacturer label. Granule concentrate: typically 3–5g dissolved in hot water, 2–3 times daily. Capsule extract: follow manufacturer's standardized dosing, usually 2–3 capsules 2–3 times daily.
• Best time of day: Traditionally taken between meals — morning and evening for twice-daily dosing, or morning, midday, and evening for three-times-daily protocols.
• With or without food: Best taken 30 minutes after a light meal to reduce digestive upset from the bitter, cold herbs. Avoid taking on an empty stomach.
• Time to effect: Acute conditions (UTI, eye or ear irritation): 3–7 days. Chronic or recurrent conditions: 2–4 weeks minimum.
• How long to take it: Typically used in short, targeted courses of 1–4 weeks for acute conditions. Not intended for long-term daily use — this is a clearing and draining formula, not a tonic. After symptom resolution, discontinue and reassess. Consult a TCM practitioner for cyclical or recurrent conditions requiring longer management plans.