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- Dictionaryside effect/ˈsʌɪd ɪˌfɛkt/
noun
- 1. a secondary, typically undesirable effect of a drug or medical treatment: "many anti-cancer 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 of the use of a medicinal drug or other treatment, usually adverse but sometimes beneficial, that is unintended. Herbal and traditional medicines also have side effects. Wikipedia