This refers to effects that occur when a medical procedure (usually drug administration) is performed in the hope of achieving a certain effect, other than the expected effect of that procedure. Although the term originally refers to effects other than the main effect, when the term "side effects" is used it generally refers to harmful effects. Side effects include those caused by allergies, those caused by toxicity (damage), those in which the main effect is too strong, and those that occur secondary to the main effect, such as nausea. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
ある効果を期待して医療行為を行なった場合に,その方法 (普通は薬物投与) で期待される作用以外に現れる作用をいう。本来主作用とは別の作用をさす用語であるが,一般に副作用という場合には,有害な作用をさすことが多い。副作用のなかにはアレルギーによるもの,毒 (傷害) 性によるもの,主作用が強く現れすぎるもの,主作用の働きによって悪心などのように2次的に発生するものなどがある。
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