Angong Niuhuang Wan (Calm the Palace Pill with Cattle Gallstone) ān gōng niú huáng wán · 安宫牛黄丸

Safety. This is an emergency-rescue formula in traditional practice, not a tonic and not something to keep on hand as a household remedy. Product labels and popular usage often present it as a stroke remedy for the home cupboard. That framing is genuinely dangerous: a person with sudden facial droop, one-sided weakness, or slurred speech needs emergency medical assessment within a narrow time window, and giving a pill by mouth to someone whose consciousness or swallow is impaired risks aspiration. Call emergency services first. - Two of the listed ingredients are metal/mineral sulfides and they should be named plainly. 朱砂 (cinnabar) is mercuric sulfide: mercury is a cumulative poison targeting the nervous system and kidney, cinnabar is far less soluble than inorganic mercury salts, but heating or incineration converts it into far more dangerous forms, and cases of mercury poisoning from cinnabar-containing preparations are published. 雄黄 (realgar) is an arsenic sulfide: arsenic is a carcinogen with skin, nerve and liver targets, and arsenic poisoning from realgar-containing preparations has been reported, particularly with heating or prolonged use. Several jurisdictions restrict or prohibit both. This product should not be used chronically, and not in pregnancy or in young children. - 犀角 (rhinoceros horn) was in the original formula; international trade has been prohibited under CITES since the 1990s and China's own ban dates to 1993, so water buffalo horn is substituted. Whether the substitution is equivalent is not established - readers should know it is a substitution, not the original. - 麝香 (musk) comes from musk deer, all species of which are CITES-listed; most modern products use synthetic musk, and the animal-derived article is not something a reader should be sourcing. - 黄连 and 黄芩 contain berberine and related alkaloids, which inhibit several cytochrome P450 enzymes and have documented interaction potential with narrow-therapeutic-index drugs; berberine also displaces bilirubin from albumin, which is why it is avoided in jaundiced newborns. - 栀子 (gardenia fruit) has animal-study signals of liver effects at high exposure; the human picture is not settled. - 冰片 (borneol) is camphor-like; camphor-type compounds are a recognised poisoning risk in small children. - Amounts used in practice are set by a licensed practitioner and are deliberately not given here.