1. Background of Origin

Zhen Gan Xi Feng Tang, also known as Calm the Liver and Extinguish Wind Decoction, is a renowned modern classical formula created by Zhang Xichun and recorded in his influential work Yixue Zhongzhong Canxilu (Records of Chinese Medicine with Reference to Western Medicine). Developed through extensive clinical observation in an era of changing lifestyles and diets, this prescription specifically targets the pattern of liver-kidney yin deficiency with hyperactive liver yang and internal wind.

It remains one of the most important formulas in Traditional Chinese Medicine for addressing symptoms such as dizziness, headache, tinnitus, irritability, and the tendency toward internal wind stirring, making it a foundational remedy for these complex patterns.

2. Hypertension

Zhen Gan Xi Feng Tang demonstrates broad therapeutic utility in managing various conditions linked to liver-kidney yin deficiency and rising liver yang.

Effective for high blood pressure accompanied by dizziness, headache, and irritability. It helps stabilize blood pressure and alleviates symptoms by nourishing yin, subduing yang, and extinguishing internal wind, reducing the risk of complications.

3. Cerebral Insufficiency (Cerebral Hypoperfusion)

Addresses dizziness, heavy head sensation, and limb numbness resulting from cerebral hypoperfusion. The formula improves cerebral circulation and enriches liver-kidney yin, thereby enhancing neurological function and symptom relief.

4. Vertigo (Meniere’s Syndrome)

Aids in treating vertigo, tinnitus, and hearing loss caused by liver-yang disturbance. It calms the liver, extinguishes wind, and nourishes yin, restoring inner-ear balance and leading to sustained symptom improvement with low relapse rates.

1. Pathogenesis: Root of Imbalance

The formula targets liver-and-kidney yin deficiency, which causes liver yang to hyperactively ascend. This imbalance leads to chaotic qi and blood movement, primarily affecting the head and eyes, manifesting as dizziness, vertigo, and a heavy sensation in the head.

2. Functions: Restoring Harmony

Zhen Gan Xi Feng Tang works by calming the liver, extinguishing internal wind, nourishing yin, and subduing hyperactive yang. It employs heavy, subduing herbs to pacify rising liver yang, while yin-nourishing and blood-tonifying herbs replenish the deficient liver-kidney yin, treating both symptoms and root cause.

3. Indications: Clinical Presentations

It is indicated for symptoms like dizziness, vertigo, head pressure, tinnitus, and vexation due to liver-kidney yin deficiency with rising liver yang. Modern applications include pattern-matched hypertension, cerebral ischemia, and vertigo, especially when a wiry, forceful pulse is present.

1. Pharmacological Insights

Zhen Gan Xi Feng Tang, also known as the decoction to subdue endogenous wind or subdue wind decoction, is a classic TCM formula designed to sedate the liver, benefit yin, and extinguish internal wind arising from liver and kidney yin deficiency. It is commonly used for symptoms such as night sweats, feverish sensation, anxiety, palpitations, insomnia, dream-disturbed sleep, frequent belching, and a feeling of distention in the chest or hypochondrium caused by rebellious qi affecting the liver and stomach. 

Studies reveal multi-system effects: modulating cardiovascular function (lowering BP, improving vascular elasticity), regulating neurotransmitter release in the nervous system, and exhibiting antioxidant/anti-inflammatory properties to counter oxidative stress and inflammation.

2. Clinical Efficacy Evidence

The formula also addresses more severe manifestations of liver wind, including tremors, spasms, facial asymmetry, deviation of the mouth, facial paralysis, progressive motor dysfunction with limited mobility, and even cerebral arteriosclerosis-related issues such as mental confusion, moments of lucidity, or sudden loss of consciousness. Containing the two shells combination (often featuring oyster shell and mother-of-pearl), Zhen Gan Xi Feng Tang helps calm the liver, anchor rising yang, and restore balance when the pulse presents as wiry and long. Clinical trials affirm efficacy in hypertension, cerebral hypoperfusion, and vertigo. It not only reduces blood pressure and improves cerebral perfusion but also alleviates associated TCM symptoms and enhances patients' quality of life with minimal side effects.

3. Dosage‑Form Innovations

Leveraging modern technology, new dosage forms like capsules and tablets offer greater convenience and stability. These innovations maintain therapeutic effectiveness, making the formula more accessible and user-friendly than traditional decoctions.

4. Mechanistic Research Advances

Zhen Gan Xi Feng Tang benefits yin while clearing irritable heat in the liver and resolving heat and pain associated with ascending liver yang. It effectively treats liver wind with feverish sensation in the five centers, dream-disturbed sleep, and mental confusion with moments of incomplete awareness. By descending rebellious qi and calming the hyperactive yang, the formula helps prevent the development of facial paralysis, including deviation of the mouth and limited mobility of the limbs. Patients often present with a wiry, long, and forceful pulse, reflecting the underlying pattern of yin deficiency with internal wind and qi rebellion that this classic decoction is designed to address.

Molecular research, including gene expression and proteomics, elucidates how the formula treats conditions related to liver-kidney yin deficiency. Preliminary findings suggest modulation of key signaling pathways influencing cell processes like proliferation and differentiation.