Source : Webster's Revised Unabridged Dictionary (1913)

Contraindicate \Con"tra*in*"di*cate\, v. t. [imp. & p. p.
   {Contraindicated}; p. pr. & vb. n. {Contraindicating}.]
   (Med.)
   To indicate, as by a symptom, some method of treatment
   contrary to that which the general tenor of the case would
   seem to require.

         Contraindicating symptoms must be observed. --Harvey.

Source : WordNet®

contraindicate
     v : make a treatment inadvisable [ant: {indicate}, {indicate}]