The Collaborative International Dictionary of English v.0.48:

Eradicative \E*rad"i*ca*tive\, n. (Med.)
   A medicine that effects a radical cure. --Whitlock.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Eradicative \E*rad"i*ca*tive\, a. [Cf. ['e]radicatif.]
   Tending or serving to eradicate; curing or destroying
   thoroughly, as a disease or any evil.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

18 Moby Thesaurus words for "eradicative":
   all-consuming, all-devouring, annihilative, arousing, educible,
   eductive, elicitory, evocative, exacting, exactive, exterminatory,
   extirpative, extirpatory, extortionary, extortionate, extortive,
   extractive, uprooting