The Collaborative International Dictionary
Antidotical
Antidotical \An`ti*dot"ic*al\ ([a^]n`t[i^]*d[=o]t"[i^]*kal), a. Serving as an antidote. -- An`ti*dot"ic*al*ly, adv.
Wiktionary
antidotical
a. Serving as an antidote.