1. Classical Source

Zhi Bai Di Huang Wan (知柏地黄丸), or Anemarrhena, Phellodendron, and Rehmannia Pill, is a classical modification of Liu Wei Di Huang Wan formed by adding Zhi Mu and Huang Bai. It belongs to the category of formulas that nourish Kidney Yin and drain deficient Fire.

This formula addresses Kidney Yin deficiency with vigorous Empty Fire, in which insufficient Yin can no longer anchor and cool Yang. Typical signs include tidal fever or night sweats, heat in the palms, soles, and chest, dry mouth and throat, sore lower back and knees, possible seminal emission or dark scanty urine, a red tongue with little coating, and a thin rapid pulse.

Combining the Liu Wei Di Huang Wan core—Shu Di Huang, Shan Zhu Yu, and Shan Yao to nourish Kidney, Liver, and Spleen Yin, with Ze Xie, Mu Dan Pi, and Fu Ling to drain turbidity—plus Zhi Mu to clear deficient Heat and moisten dryness, and Huang Bai to drain ministerial Fire from the Lower Burner, Zhi Bai Di Huang Wan effectively replenishes true Yin, descends Empty Fire, and is especially suited when Liu Wei Di Huang Wan alone is not enough to control the Heat.

2. Urinary System Disorders

Zhi Bai Di Huang Wan is widely applied in various conditions where liver–kidney yin deficiency with internal fire is the root cause, demonstrating its versatility in restoring internal balance. 

Effective for conditions like chronic pyelonephritis and cystitis, reducing low back soreness, urinary frequency, and painful urination by nourishing renal yin and clearing inflammation.

3. Reproductive System Disorders

Beneficial for issues such as spermatorrhea, premature ejaculation, and menopausal symptoms (hot flashes, night sweats) by nourishing yin, subduing fire, and stabilizing essence.

4. ENT Disorders

Addresses chronic pharyngitis, oral ulcers, and periodontal disease stemming from yin deficiency and blazing fire, reducing local inflammation and alleviating pain.

5. Dermatologic Disorders

Used adjunctively for acne and seborrheic dermatitis patterns linked to liver–kidney yin deficiency with deficiency fire, helping to rebalance internal yin–yang and mitigate skin inflammation.

1. Pathogenesis: Yin Deficiency & Fire

This formula specifically addresses liver–kidney yin deficiency complicated by internal deficiency fire, restoring balance through its precise combination of nourishing and heat-clearing herbs.

The core imbalance is liver–kidney yin depletion, which fails to restrain yang, leading to exuberant deficiency fire. This "virtual heat" causes symptoms like dizziness, tinnitus, irritability, dry throat, and night sweats.

2. Key Functions: Nourishing Yin & Clearing Fire

The formula primarily nourishes yin (with Shu Di Huang, Shan Zhu Yu, Shan Yao) and clears deficiency fire (Zhi Mu, Huang Bai). Auxiliary herbs (Ze Xie, Mu Dan Pi, Fu Ling) further promote fluid metabolism and cool blood, rebalancing yin and yang.

3. Clinical Indications: Deficiency Fire Patterns

Used for symptoms arising from liver–kidney yin deficiency with rising virtual fire, including dizziness, tinnitus, five-center heat, night sweats, bone steaming, and lower back/knee soreness. It's particularly suited for older adults, or those with chronic conditions leading to yin depletion.