verb (used without object)
to react or respond more strongly than is necessary or appropriate.

1960–65; over- + react

overreaction, noun
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World English Dictionary
overreact (ˌəʊvərɪˈækt)
(intr) to react excessively to something

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1961, from over + react. Related: Overreacting.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

overreact o·ver·re·act (ō'vər-rē-ākt')
v. o·ver·re·act·ed, o·ver·re·act·ing, o·ver·re·acts
To react with unnecessary or inappropriate force, emotional display, or violence.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Markets always overreact in the short run, even if the news is essentially non
Food allergies occur when immune cells overreact to a foreign substance.
It is extremely important not to overreact to the emergence of new nuclear
Although the microchip needle is larger than a typical vaccine needle, animals
  do not usually overreact it.
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