副作用(ふくさよう)

ふくさよう
noun
side effect
1. side effect, adverse effect
An undesirable secondary effect that occurs in addition to the desired therapeutic effect of a drug or medical treatment.
この薬(くすり)は副作用(ふくさよう)が少(すく)ない。
This medicine has few side effects.
副作用(ふくさよう)として眠気(ねむけ)が出(で)ることがあります。
Drowsiness may occur as a side effect.
副作用(ふくさよう)が強(つよ)いので、医師(いし)に相談(そうだん)した方(ほう)がいい。
Since the side effects are strong, you should consult a doctor.

副作用(ふくさよう) refers to side effects of medication or medical treatment. 副(ふく) means 'secondary/sub-' and 作用(さよう) means 'effect/action.'

COMMON EXPRESSIONS:

  • 副作用(ふくさよう)が出(で)る: to experience side effects
  • 副作用(ふくさよう)が強(つよ)い: to have strong side effects
  • 副作用(ふくさよう)が少(すく)ない: to have few side effects
  • 副作用(ふくさよう)のリスク: risk of side effects

COMMON SIDE EFFECTS:

  • 眠気(ねむけ): drowsiness
  • 吐(は)き気(け): nausea
  • 頭痛(ずつう): headache
  • 発疹(はっしん): rash

RELATED WORDS:

  • 薬(くすり): medicine
  • 効能(こうのう): efficacy
  • 服用(ふくよう): taking medicine
general
Added 2026.1.14 19:37 · Revised 2026.1.19 21:17
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