Bai Hua She 白花蛇 — Chinese Herbal Medicine

Bai Hua She (白花蛇) At a Glance

• Herb: Bai Hua She
• Chinese name: 白花蛇 (Bai Hua She)
• Latin name: Agkistrodon Acutus (Deinagkistrodon acutus, Sharp-Nosed Pit Viper)
• Nature: Warm
• Taste: Sweet, Salty
• Meridian: Liver
• Category: Relieves rheumatism and dispels cold.

Bai Hua She (白花蛇, Agkistrodon/Deinagkistrodon) refers to the dried body of the sharp-nosed pit viper, Deinagkistrodon acutus (Günther) (Viperidae), a venomous snake native to southern China and Taiwan. The name ‘white-patterned snake’ (Bai Hua She) describes the distinctive pale grey-brown body with darker saddle markings. In classical literature, it is also known as Qi She (蕲蛇), referring to the Qizhou region where the finest specimens were sourced. Bai Hua She is classified among the Wind-Damp-dispelling herbs with the unique ability of an animal-based medicine to ‘search the channels and collaterals’ (搜风通络) — penetrating deep into the vessels where plant-based herbs cannot reach, dispelling stubborn, entrenched Wind, and unblocking the Luo vessels. This makes it invaluable for chronic Bi syndrome with fixed, severe pain, post-stroke paralysis and contracture, and intractable skin disorders. Modern pharmacological research has identified potent anticoagulant, analgesic, and anti-inflammatory peptides in the venom and tissue extracts. Due to conservation concerns (CITES-listed and endangered), ethical sourcing and consideration of herbal alternatives are essential in modern practice.

Actions & Therapeutic Effects

• Searches the channels and collaterals to dispel Wind (搜风通络) — the defining animal-medicine action; penetrates deep into the channels and Luo vessels for entrenched, stubborn Wind.
• Alleviates chronic Bi pain and muscle contracture — treats chronic Wind-Damp Bi with fixed, severe joint pain, muscle spasms, and hemiplegia from stroke.
• Dispels Wind and stops itching — treats intractable pruritic skin disorders including psoriasis, chronic eczema, and neurodermatitis.
• Unblocks the Luo vessels and treats stroke sequelae — for post-stroke hemiplegia, facial paralysis, and numbness that has not responded to plant-based herbs.
• Calms the Liver and extinguishes internal Wind — for chronic Liver Wind with spasms, tremors, and convulsions.

Clinical Applications in TCM

• Chronic Wind-Damp Bi with fixed, severe joint pain and muscle wasting — Bai Hua She Jiu (medicinal wine) or decoction
• Post-stroke hemiplegia, facial paralysis, and numbness — combined with Di Long, Quan Xie, and Wu Gong
• Intractable psoriasis, chronic eczema, and neurodermatitis — used with Chan Tui, Jing Jie, and Sheng Di Huang
• Rheumatoid arthritis with joint deformity — Bai Hua She extract or decoction as long-term therapy
• Trigeminal neuralgia — combined with Quan Xie and Chuan Xiong
• Leprosy (historical indication) — used in classical leprosy formulas
• Chronic urticaria from Wind — paired with Fang Feng and Jing Jie

Precautions & Safety

• Dosage: 3–10 g in decoction; 1–1.5 g as powder; 0.5–1 whole snake steeped in 500–1000 mL wine
• Contraindicated in Yin deficiency with internal Heat or Blood deficiency generating Wind
• Contraindicated in pregnancy — toxic and Blood-moving
• Mild toxicity — strictly control dosage; overdose may cause dizziness, nausea, and bleeding
• May cause allergic reactions in sensitive individuals (animal protein allergy)
• Conservation status: Deinagkistrodon acutus is endangered and CITES-listed — ensure ethical, legally sourced material or use alternative herbs
• Alternatives: Wu Shao She (Zaocys dhumnades, black-striped snake) is a non-endangered, milder alternative; Di Long (earthworm) and Jiang Can (silkworm) for milder channel-searching action

Classical TCM Formulas

• Bai Hua She Jiu (白花蛇酒): Bai Hua She steeped in yellow rice wine — Wind-Damp Bi and numbness. Source: Classical medicinal wine tradition.
• Da Huo Luo Dan (大活络丹) includes Bai Hua She among 50 ingredients: for chronic Wind stroke and Bi with multiple channel involvement. Source: Lan Tai Gui Fan.
• Bai Hua She Tang (白花蛇汤): Bai Hua She, Qiang Huo, Fang Feng, Dang Gui, Chuan Xiong, Bai Shao, Gan Cao — chronic Bi and post-stroke numbness. Source: Classical channel-dredging formula.

Herb Combinations

• Bai Hua She + Quan Xie (全蝎) + Wu Gong (蜈蚣): the three channel-searching animal medicines — for severe, intractable Wind-pattern pain and spasms.
• Bai Hua She + Qiang Huo (羌活) + Du Huo (独活): Bai Hua She searches the channels; Qiang Huo and Du Huo dispel surface Wind-Damp — for Bi pain with both surface and deep involvement.
• Bai Hua She + Huang Qi (黄芪) + Dang Gui (当归): supplements Qi and Blood while unblocking channels for post-stroke hemiplegia with deficiency. Source: Bu Yang Huan Wu Tang + Bai Hua She.
• Bai Hua She + Sheng Di Huang (生地黄) + Fang Feng (防风): dispels Wind, cools Blood, and stops itching for chronic eczema and psoriasis.
• Bai Hua She + Di Long (地龙): the two channel-searching animals — additive effect for chronic Bi and stroke.

Pharmacology & Research

Anticoagulant and antiplatelet: snake venom-derived peptides (including ancrod-like enzymes) produce defibrination and inhibit platelet aggregation — the biochemical basis for ‘unblocking the collaterals.’
Analgesic: venom peptides modulate sodium and calcium channels, producing dose-dependent analgesia in neuropathic pain models.
Anti-inflammatory: tissue extracts suppress TNF-α, IL-1β, and COX-2 in inflammatory models.
Neurotrophic: nerve growth factor (NGF)-like peptides in venom promote neuronal survival and neurite outgrowth, supporting traditional use in stroke recovery.
Immunomodulatory: whole-body extracts demonstrate bidirectional immune regulation — suppressing autoimmune inflammation while enhancing anti-tumour immunity.

Classical Descriptions

• 《开宝本草》(Kai Bao Ben Cao, 973 CE): “白花蛇，味甘咸，温，有毒。主中风湿痹不仁，筋脉拘急，口面歪斜，半身不遂，骨节疼痛，大风疥癞及暴风瘙痒。” (Bai Hua She: sweet-salty, warm, toxic. Governs wind-strike Damp-Bi with numbness; sinew and vessel spasms; deviated mouth and eyes; hemiplegia; bone and joint pain; great-wind scabies and leprosy; sudden wind-pruritus.)
• 《本草纲目》(Bencao Gangmu, 1596) — Li Shizhen: “白花蛇，能透骨搜风，截惊定搐，为风痹惊搐、癞癣恶疮要药。凡服蛇酒药，切忌见风。” (Bai Hua She can penetrate to the bone and search out Wind, arrest fright and settle convulsions — it is an essential medicinal for Wind-Bi, fright-convulsions, and malignant scabies and sores. Whenever taking snake medicinal wine, strictly avoid exposure to wind.)
• 《本草备要》(Bencao Beiyao, 1694) — Wang Ang: “白花蛇，甘咸温有毒。透骨搜风，截惊定搐。” (Bai Hua She: sweet-salty, warm, toxic. Penetrates to the bone and searches out Wind; arrests fright and settles convulsions.)