附子是毛茛科植物乌头（Aconitum carmichaelii）的子根。根据加工方法不同而分成“盐附子”、“黑顺片”和“白附片”、炮附子等。。

辛、甘，大热；有毒。归心、肾、脾经。

Aconitum carmichaelii syn. A. fischeri, is a species of flowering plant of the genus Aconitum, family Ranunculaceae. It is native to East Asia and eastern Russia. It is commonly known as Chinese aconite, Carmichael's monkshood or Chinese wolfsbane (Chinese:乌头附子; pinyin:Wu-tou Fu-zi) (Japanese:鸟兜 or トリカブト, Torikabuto). It is known in Mandarin as Fu Zi (meaning daughter root, or lateral root) and as Wu Tou (meaning tuberous mother root, or root tuber).