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Side Effect

By Julie Stachowiak, Ph.D., About.com

Updated: January 14, 2008

About.com Health's Disease and Condition content is reviewed by the Medical Review Board

Definition: An effect of a drug other than those desired.

The term usually refers to negative effects, such as flu-like symptoms, headaches, liver damage, etc. Side effects can be immediate (some injection-site reactions) or long-term (cardiac damage).

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