adverse reaction

[ ăd-vûrs, ădvûrs′ ]

n.

A result of drug therapy that is neither intended nor expected in normal therapeutic use and that causes significant, sometimes life-threatening conditions.

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Question 1 of 7
What does “vacillate” mean?
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.