Fang Ji (防己) — TCM Herb for Damp-Heat Bi-Syndrome & Edema

At a Glance

• Herb: Fang Ji
• Chinese name: 防己 (Fáng Jǐ)
• Latin name: Stephaniae tetrandrae Radix
• Nature: Cold
• Taste: Bitter / Acrid
• Meridian: Bladder / Lung / Spleen
• Category: Herbs that Expel Wind-Dampness
• Introduction: Fang Ji (Radix Stephaniae Tetrandrae) refers to the root of Stephania tetrandra (Han Fang Ji), first documented in the Shen Nong Ben Cao Jing as a mid-grade herb. Note: Guang Fang Ji (Aristolochia fangchi) bears the same name but contains nephrotoxic aristolochic acid and is avoided in modern practice — Han Fang Ji is the standard. This bitter and cold herb excels at clearing Damp-Heat from the lower body, making it particularly effective for hot, swollen joints and edema. Tetrandrine, its primary alkaloid, demonstrates anti-inflammatory, antihypertensive, and immunomodulatory effects in modern research.

Action

• Dispels Wind-Damp and alleviates Bi-syndrome pain, especially Damp-Heat type
• Promotes urination and reduces edema, particularly in the lower extremities
• Clears Heat and resolves Damp accumulation in the joints and urinary tract

Clinical Application

• Wind-Damp-Heat Bi-syndrome with hot, red, swollen, painful joints (re bi)
• Edema and lower limb swelling from Damp-Heat accumulation
• Ascites and leg qi (jiao qi) with heaviness and swelling
• Dampness in the lower burner with difficult urination

Precautions

• Dose: 5–10 g in decoction
• Han Fang Ji (Stephania tetrandra) must be used — never Guang Fang Ji (Aristolochia fangchi) due to aristolochic acid nephrotoxicity
• Contraindicated in Yin deficiency patterns or Heat from deficiency without Damp
• Use cautiously in patients with pre-existing renal impairment
• Bitter cold nature may injure the Spleen-Stomach; combine with warming or Qi-tonifying herbs in deficient patients

Formula

• Fang Ji Huang Qi Tang (防己黄芪汤) — Fang Ji + Huang Qi + Bai Zhu + Gan Cao + Sheng Jiang + Da Zao, for Wind-Water edema with Qi deficiency
• Xuan Bi Tang (宣痹汤) — Fang Ji + Yi Yi Ren + Hua Shi + Lian Qiao + Shan Zhi Zi, for Damp-Heat Bi-syndrome with swollen joints
• Ji Jiao Li Huang Wan (己椒苈黄丸) — Fang Ji + Jiao Mu + Ting Li Zi + Da Huang, for water accumulation with constipation

Combinations

• Stephania Root (防己) + Astragalus Root (黄芪) + Atractylodes Rhizome (白术) → Fang Ji Huang Qi Tang (防己黄芪汤): tonify qi, drain dampness; wind-damp bi syndrome, knee edema, and obesity
• Stephania Root (防己) + Coix Seed (薏苡仁) + Talcum (滑石) → clear damp-heat; hot bi syndrome with joint swelling and heat

Pharmacological Effects

• Anti-inflammatory
  • tetrandrine — blocks calcium channels, inhibits NF-kB
• Antihypertensive
  • tetrandrine — calcium channel blocker
• Antifibrotic
  • treats silicosis and lung fibrosis — tetrandrine approved in China
• Immunosuppressive; antitumor; diuretic; analgesic; note: aristolochia fangchi
  • 广防己) is nephrotoxic — use only Stephania tetrandra (汉防己

Classic Description

• Shen Nong Ben Cao Jing (《神农本草经》): ‘Governs wind-cold-warm malaria with heat qi, all types of seizures, removes pathogenic qi, and promotes urination and defecation.’
• Ben Cao Gang Mu (《本草纲目》): ‘Stephania Root is a tai yang channel herb; therefore it treats lower jiao damp-heat swelling and pain, Bladder heat accumulation, suspended fluid between the diaphragm, wind-damp of the twelve channels, removes pathogenic qi, and promotes urination and defecation — all from its bitter-cold heat-clearing function.’
• Ming Yi Bie Lu (《名医别录》): ‘Treats water edema and wind edema; eliminates Bladder heat; treats cold-febrile pathogen of wind-cold disorders and wind stroke with hand weakness.’