contraindicate(v = verb.communication) - make a treatment inadvisable;
Antonym: indicate, indicate
Derived form noun contraindication₁
Sample sentences: Something ----s something

   To indicate, as by a symptom, some method of treatment contrary to that which the general tenor of the case would seem to require; especially, to indicate that a particular method of treatment should not be used; as, penicilin is contraindicated in patients who have shown hypersensitivity. [1913 Webster]

contraindicate, v.tr. Med. act as an indication against (the use of a particular substance or treatment).

Derivative:
contraindication n.

VB  dissuade, dehort, cry out against, remonstrate, expostulate, warn, contraindicate, disincline, indispose, shake, stagger, dispirit, discourage, dishearten, deter, repress, hold back, keep back, render averse, repel, turn aside, wean from, act as a drag, throw cold water on, damp, cool, chill, blunt, calm, quiet, quench, deprecate, disenchant, disillusion, deflate, take down a peg, pop one's balloon, prick one's balloon, burst one's bubble, disabuse (correction).