side effect

noun
1.
any effect of a drug, chemical, or other medicine that is in addition to its intended effect, especially an effect that is harmful or unpleasant.
2.
any accompanying or consequential and usually detrimental effect: the side effects of air pollution.
Also, side-ef·fect.

Origin:
1880–85

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
side effect
 
—n
1.  Compare aftereffect any unwanted nontherapeutic effect caused by a drug
2.  any secondary effect, esp an undesirable one

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Side effect is always a great word to know.
So is doohickey. Does it mean:
the offspring of a zebra and a donkey.
a gadget; dingus; thingumbob.
LEARN MORE UNUSUAL WORDS WITH WORD DYNAMO...
American Heritage
Medical Dictionary

side effect n.
A peripheral or secondary effect, especially an undesirable secondary effect of a drug or therapeutic regimen.

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
One unfortunate side effect of this system is that if you find a new weapon
  while adventuring, you have no choice but to equip it.
In a side effect, three patients who took the highest dose experienced weakness
  on one side of the body.
The one is only an unintentional side effect of the other.
For example, anemia is a common side effect of cancer treatments.
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