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Houyan Wan (喉炎丸) is a traditional Chinese medicine (TCM) formulation primarily used for the treatment of throat inflammation, including laryngitis, pharyngitis, tonsillitis, and sore throat, as well as boils and carbuncles. The formulation typically consists of a combination of traditional herbal and animal-derived ingredients, including borax (硼砂), Coptis chinensis (黄连), toad venom (蟾酥), bear gall (熊胆), water buffalo horn (水牛角浓缩粉), calculus bovis (牛黄), borneol (冰片), pearl (珍珠), Galla chinensis (五倍子), Asarum (细辛), musk (麝香), and human fingernail (人指甲). It is marketed as an approved, protected TCM product in China and distributed in regions like Hong Kong by companies such as Fung Wah.
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