allopathy

n. treatment of diseases using substances that cause different effects from that of the disease itself

The term allopathic, an adjective, is used in medicine to distinguish one form medical practice, medical tradition, or medical profession from another.
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Noun
1. the usual method of treating disease with remedies that produce effects differing from those produced by the disease itself
(antonym) homeopathy, homoeopathy
(hypernym) medical care, medical aid

(n.)
That system of medical practice which aims to combat disease by the use of remedies which produce effects different from those produced by the special disease treated; -- a term invented by Hahnemann to designate the ordinary practice, as opposed to homeopathy.
  

noun
treatment of a condition using drugs which produce opposite symptoms to those of the condition
compare HOMEOPATHY