Lǐ Dāngzhī 李當之 (fl. c. late second to early third century CE), one of the two principal medical disciples of Huà Tuó 華佗 華佗 (alongside Wú Pǔ 吳普 吳普). The pair is named in 《後漢書·方術傳》 j.82 and 《三國志·魏志》 j.29 as Huà’s transmitters; Lǐ is also cited routinely in 《吳普本草》 as 李氏, where his pharmacological opinions on flavour, temperature, and toxicity are recorded alongside those of Shénnóng, Tóngjūn, Léi Gōng, Qí Bó, and Biǎn Què — making him one of the named pre-Táng bĕncǎo authorities.
He is credited in later bibliographies (《隋書·經籍志》, 《新唐書·藝文志》) with a Yàolù 藥錄 (Drug Record) and a Bĕncǎo jīng 本草經 redaction, both lost. According to Táo Hóngjǐng’s preface to 《本草經集注》 (KR3ec003), Wú Pǔ and Lǐ Dāngzhī together introduced disorder into the inherited Shénnóng bĕncǎo by their additions and subtractions — some witnesses had 595 entries, some 441, some 319, with the three grades (上中下品) confused. Táo regards their work as substantively valuable but textually unstable, motivating his own re-organization. The principal modern fragment-edition is Shàng Zhìjūn’s 尚志鈞 Lǐ Dāngzhī Yàolù jíběn 李當之藥錄輯本 (collected in Bĕncǎo rénshēng 本草人生).
In the Kanripo corpus he is the traditional attributee of KR3e0108 Yàolù — a brief fragments-collection whose status as Lǐ Dāngzhī’s autograph is internally complicated by the fact that the surviving entries cite “李氏” in the third person (see the KR3e0108 note for discussion).
No CBDB record (he predates the conventional CBDB scope). No DILA authority record (not a Buddhist figure).