TCM Properties

Traditional Use

Opens the Heart orifices and revives consciousness — heat-induced closed-type coma and loss of consciousness; Phlegm-Fire obstructing the Heart orifices presenting as delirium, unconsciousness, high fever, and incoherent speech; the artificial bezoar is the principal substitute for natural Niu Huang in emergency formulas including An Gong Niu Huang Wan; widely used for acute ischemic and hemorrhagic stroke, meningitis, and encephalitis with Hot-Closed pattern
Clears Heat and resolves Toxicity — Fire-Toxin conditions with hot carbuncles, throat infections (Ru E, obstructed throat swelling), oral ulcers, mouth sores, and furuncles; the bitter-cool nature directly clears Fire Toxin; most widely encountered in Niu Huang Jie Du Pian, one of the most commonly used OTC patent medicines in China
Extinguishes Liver Wind and controls tremors and convulsions — Heat generating Wind with seizures, tremors, spasms, and high febrile convulsions in children; works via Liver channel to cool Wind-Heat and calm internal Wind; used in Xiao Er Niu Huang San for pediatric febrile convulsions

Clears Phlegm-Heat — turbid Phlegm-Heat obstructing the Mind with mental confusion, agitation, and productive cough; less emphasized than the orifice-opening and toxin-resolving actions
Calms Shen agitation from Heart Fire — restlessness, insomnia, and palpitations from Fire disturbing the Heart Shen; secondary indication in Heart Fire formulas

An Gong Niu Huang Wan (安宫牛黄丸) — one of the Three Treasures of TCM emergency medicine (alongside Zhi Bao Dan and Zi Xue Dan); for acute Hot-Closed patterns including stroke, high fever with coma, meningitis, and encephalitis; original formula from Wen Bing Tiao Bian (Wu Jutong) contains Niu Huang, She Xiang, Huang Lian, Huang Qin, Zhi Zi, Zhen Zhu, Xiong Huang, Bing Pian, and Zhu Sha; modern versions substitute artificial bezoar for natural Niu Huang and often omit the mercury/arsenic ingredients
Niu Huang Jie Du Pian/Wan (牛黄解毒片/丸) — the most widely used OTC patent medicine in China for Fire-Toxin throat infection, oral ulcers, and skin Heat conditions; contains artificial bezoar, realgar (雄黄, arsenic), Da Huang, Huang Qin, Bing Pian, Gan Cao, and Shi Gao; caution with the realgar-containing versions
Xiao Er Niu Huang San (小儿牛黄散) — pediatric formula for febrile convulsions, high fever, and phlegm obstruction; Niu Huang combined with Tian Zhu Huang, Dan Nan Xing, Chan Tui, and Gou Teng to clear Wind-Heat and stop convulsions

Shen Nong Ben Cao Jing (upper class): Niu Huang (牛黄, natural ox gallstone) — 'bitter, neutral; resolves toxicity, resists evil Qi, calms fright, opens orifices, resolves Phlegm; indicated for fright convulsions, coma from Heat toxin, throat obstruction, hot swelling'; the artificial bezoar is the contemporary Pharmacopoeia-approved substitute maintaining these core actions
Wen Bing Tiao Bian (Wu Jutong, Qing dynasty): 'An Gong Niu Huang Wan opens the orifices, resolves Phlegm, cools the Ying level; for Heat entering the Pericardium with coma, delirium, and hot closed syndrome; Niu Huang is the chief drug that opens the Qi orifices and resolves Fire Toxin'

Bilirubin (~0.7% in artificial bezoar; ~40% in natural Niu Huang) — the principal pigment of bile; antioxidant, anti-inflammatory, and neuroprotective at physiological levels; the low bilirubin content of artificial bezoar relative to natural Niu Huang is the primary pharmacological difference between the two
Cholic acid (~5%) — primary bile acid; anti-inflammatory, hepatoprotective, and digestive; interacts with bile acid receptors (FXR, TGR5)
Cholesterol (~2%) — structural component; contributes to the matrix of the formulation
Taurine (in some formulations) — CNS inhibitory neuromodulator; may contribute to anticonvulsant and sedative-like actions consistent with the classical orifice-opening and tremor-stopping actions

Neuroprotection and stroke: An Gong Niu Huang Wan (containing artificial bezoar) has been studied in multiple Chinese RCTs for acute ischemic stroke; systematic reviews suggest benefit in neurological recovery scores and reduced mortality in Hot-Closed pattern stroke, though evidence quality is mixed; the formula's multiple mechanisms (anti-inflammatory, neuroprotective, anti-edema) support its emergency use
Anti-inflammatory: bilirubin at low concentrations exerts antioxidant and anti-inflammatory effects, scavenging reactive oxygen species and reducing NF-κB activation; cholic acid activates TGR5 and FXR reducing hepatic and systemic inflammation
Anticonvulsant: animal models of febrile seizures show that Niu Huang preparations reduce convulsion frequency and duration; bilirubin's GABAergic modulation and taurine's glycinergic inhibition are proposed mechanisms validating the classical convulsion-controlling action
Comparison with natural Niu Huang: natural Niu Huang contains ~40% bilirubin versus ~0.7% in the artificial form; pharmacological studies show artificial bezoar has comparable but reduced potency for orifice-opening and fever-clearing actions; clinical consensus in China accepts artificial bezoar as suitable for mild-to-moderate conditions while natural Niu Huang (or in vitro cultivated bezoar) is preferred for acute emergency use in stroke and coma

Pregnancy — strong downward-driving and orifice-opening actions; cold-cool nature; avoid internal use at therapeutic doses during pregnancy
Cold-pattern or Cold-Deficiency constitution — cool-bitter nature injures Spleen and Stomach Yang; do not use in Cold-Closed (Yang closed) patterns; artificial bezoar is indicated only for Hot-Closed (Yin closed) patterns with fever and delirium, NOT for Cold-Closed patterns

Compound formulas: Niu Huang Jie Du Pian and An Gong Niu Huang Wan contain additional ingredients with independent safety concerns — the original An Gong NHW contains cinnabar (朱砂, mercury sulfide) and Niu Huang Jie Du Pian contains realgar (雄黄, arsenic disulfide); these compound formulas require their own safety assessment separate from artificial bezoar itself
Artificial vs natural vs cultivated bezoar: Calculus Bovis Artificiosus (人工牛黄 Ren Gong Niu Huang) is distinct from both Calculus Bovis (天然牛黄 Tian Ran Niu Huang, natural gallstones) and Calculus Bovis Sativus (体培牛黄 Ti Pei Niu Huang, in vitro cultivated); natural and cultivated bezoar have higher bilirubin content and greater potency; prescriptions should specify which form is used
International availability: natural Niu Huang is subject to CITES trade restrictions as a cattle by-product requiring documentation; artificial bezoar is unrestricted in most jurisdictions but check local regulations for compound formulas