Fang Feng 防风 (Saposhnikovia Root) — Chinese Herbal Medicine

At a Glance

• Herb: Fang Feng
• Chinese name: 防风 (Fáng Fēng)
• Latin name: Radix Saposhnikoviae (Saposhnikovia divaricata (Turcz.) Schischk.)
• Nature: Slightly Warm
• Taste: Acrid / Sweet
• Meridian: Bladder / Liver / Spleen
• Category: Herbs that Release the Exterior — Warm Acrid (辛温解表药)
• Introduction: Fang Feng (防风, Saposhnikovia root / Ledebouriella root) is the premier ‘wind-expelling’ herb in Chinese medicine. Its name literally means ‘guard against wind,’ reflecting its universal use for dispersing wind from any location — exterior, interior, head, channels, or intestines. Unlike other exterior-releasing herbs that are specifically warm or cool, Fang Feng is mild and balanced — able to treat both wind-cold and wind-heat patterns. Its gentle, penetrating nature makes it one of the most versatile herbs for pain, skin conditions, and diarrhea from Liver-Spleen disharmony.

Action

• Releases the exterior and disperses wind-cold (解表散风寒)
• Dispels wind-damp and relieves bi syndrome pain (祛风湿，止痹痛)
• Stops spasms and extinguishes wind (止痉息风)
• Stops diarrhea from Liver invading Spleen (止泻)
• Disperses wind from the skin and relieves itching (祛风止痒)

Clinical Application

• Wind-cold exterior pattern: fever, chills, headache, body aches, stiff neck — the universal wind-expelling herb
• Wind-cold-damp bi syndrome: joint pain, muscle aches, stiffness worse in wind and cold — guides other herbs to the joints
• Wind rashes and skin itching: urticaria, eczema, pruritus from wind
• Internal wind: tetanus, tremors, convulsions — extinguishes wind
• Liver invading Spleen diarrhea: painful diarrhea with abdominal cramping from Liver-Spleen disharmony — used in Tong Xie Yao Fang
• Headache and migraine: from wind in the channels

Precautions

• Avoid in blood deficiency with wind (内风 from deficiency) — dispersing nature worsens yin deficiency
• Use cautiously in yin deficiency with heat — warm nature may aggravate
• Avoid in exterior deficiency sweating without wind-cold pattern
• Generally safe; one of the gentlest exterior-releasing herbs
• Classical note: antagonizes Gan Jiang (some classical sources) — verify context

Formula

• Yu Ping Feng San (玉屏风散): Huang Qi, Bai Zhu, Fang Feng — wei qi deficiency
• Tong Xie Yao Fang (痛泻要方): Bai Zhu, Bai Shao, Chen Pi, Fang Feng — Liver-Spleen diarrhea
• Jing Fang Bai Du San (荆防败毒散): Jing Jie, Fang Feng + wind-expelling herbs — wind-cold exterior
• Du Huo Ji Sheng Wan (独活寄生丸): Du Huo + Fang Feng + joint herbs — chronic bi
• Xiao Feng San (消风散): Fang Feng + Jing Jie + Ku Shen — wind rash
• Fang Feng Tong Sheng San (防风通圣散): Fang Feng + interior-exterior herbs — exterior-interior heat

Combinations

• [Treatise on Cold Damage — Shāng Hán Lùn (伤寒论), Zhang Zhongjing, ~200 CE] Fang Feng + Jing Jie + Du Huo + Chuan Xiong + Bai Zhi + Qiang Huo + Chai Hu + Qian Hu + Zhi Ke + Fu Ling + Jie Geng + Gan Cao + Sheng Jiang + Bo He: Jing Fang Bai Du San (荆防败毒散) — for wind-cold exterior with body aches and headache
• [Formulary of the Bureau of People’s Welfare Pharmacies — Tài Píng Huì Mín Hé Jì Jú Fāng (太平惠民和剂局方), Song Imperial Medical Bureau, 1107] Fang Feng + Bai Zhu + Huang Qi: Yu Ping Feng San (玉屏风散) — for wei qi deficiency with spontaneous sweating and frequent colds; Fang Feng’s dispersing action balances Huang Qi’s consolidating action
• [Compendium of Materia Medica — Běn Cǎo Gāng Mù (本草纲目), Li Shizhen, 1596] Fang Feng + Bai Zhu + Bai Shao + Chen Pi: Tong Xie Yao Fang (痛泻要方) — for painful diarrhea from Liver invading Spleen
• [Classified Materia Medica — Lèi Jīng (类经), Zhang Jiebin, 1624] Fang Feng + Qiang Huo + Du Huo + Fang Ji + Wei Ling Xian: for wind-cold-damp bi syndrome with severe joint pain
• [Formulary of the Bureau of People’s Welfare Pharmacies — Tài Píng Huì Mín Hé Jì Jú Fāng (太平惠民和剂局方), Song Imperial Medical Bureau, 1107] Fang Feng + Jing Jie + Ku Shen + Cang Zhu + Chan Tui: for wind rashes, urticaria, and eczema from wind-damp

Pharmacological Effects

• cimifugin
  • Anti-inflammatory: inhibits NF-κB and COX-2
  • Anti-inflammatory: reduces joint inflammation
• chromones
  • Analgesic: raise pain threshold
  • Analgesic: polyacetylenes have local analgesic effects
• Antipyretic
  • reduces fever via hypothalamic mechanisms
• polysaccharides
  • Immunomodulatory: enhance macrophage and T-cell activity
• Antispasmodic
  • relaxes intestinal smooth muscle
• Antimicrobial
  • polyacetylenes active against bacteria and fungi
• Antitumor
  • falcarinol has antiproliferative activity
• Antiallergic
  • inhibits mast cell degranulation
  • reduces histamine release

Classic Description

• [Shen Nong’s Classic of Materia Medica — Shén Nóng Běn Cǎo Jīng (神农本草经), ~100 BCE] “Fang Feng is acrid and warm. It mainly treats wind evil, headache, dizziness, and painful bi with sweating; removes wind in the body; and treats blind eyes with overflowing tears.” (防风，味辛温。主大风头眩痛，恶风风邪，目盲无所见，风行周身，骨节疼痹，烦满。)
• [Compendium of Materia Medica — Běn Cǎo Gāng Mù (本草纲目), Li Shizhen, 1596] “Fang Feng is the most gentle of all wind-expelling herbs. It neither too hot nor too cold, neither too drying nor too moistening. It can enter any channel where wind lodges. In Yu Ping Feng San its small dose serves as a guide to the defensive level without competing with Huang Qi’s consolidating action — a masterful use of opposition within a formula.” (防风为祛风诸药中最平和者，不偏热冷，不偏燥润，能入诸经之有风处。玉屏风中小量为向导，不与黄芪固表相争——方中用对立之妙。)
• [Essentials from the Golden Cabinet — Jīn Guì Yào Lüè (金匮要略), Zhang Zhongjing, ~200 CE] “For wind bi with pain and inability to bend: Fang Feng Tang governs.” (风痹肢节疼痛，不可屈伸者，防风汤主之。)