The Collaborative International Dictionary of English v.0.48:

Alexipharmic \A*lex`i*phar"mic\
   ([.a]*l[e^]ks`[i^]*f[aum]r"m[i^]k), Alexipharmical
\A*lex`i*phar"mic*al\ ([.a]*l[e^]ks`[i^]*f[aum]r"m[i^]k*al), a.
   [Gr. 'alexifa`rmakos keeping off poison; 'alexein to keep off
   + fa`rmakon drug, poison: cf. F. alexipharmaque.] (Med.)
   Of or relating to an alexipharmic or alexipharmac; warding
   off poison; antidotal; prophylactic. [obsolescent]
   [1913 Webster + AS] Alexipharmac