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- DictionarySide ef·fect/ˈsīd əˌfek(t)/
noun
- 1. a secondary, typically undesirable effect of a drug or medical treatment: "many anticancer drugs now in use have toxic side effects"
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noun
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In medicine, a side effect is an effect, whether therapeutic or adverse, that is unintended; although the term is predominantly employed to describe adverse effects, it can also apply to beneficial, but unintended, consequences of the use of a drug. Occasionally, drugs are prescribed or procedures are performed for their side effects; in that case, said side effect ceases to be a side effect and i... Wikipedia