adverse reaction

Medical Dictionary

adverse reaction ad·verse reaction (ād-vûrs', ād'vûrs')
n.
A result of drug therapy that is neither intended nor expected in normal therapeutic use and that causes significant, sometimes life-threatening conditions.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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