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Side effect
01
副作用（ふくさよう）, 後効果（こうこうか）
a secondary effect of any drug or medicine, usually an undesirable one
What is a "side effect"?
A side effect is an unwanted or unexpected symptom that occurs as a result of taking a medication or undergoing a treatment. Side effects can range from mild issues, like a headache or upset stomach, to more serious problems. They are not the main purpose of the medication but can occur alongside its intended benefits.
Example
While the new medication effectively managed her symptoms, she was concerned about the potential side effects, including nausea and fatigue.
新しい薬は彼女の症状を効果的に管理しましたが、彼女は吐き気や疲労を含む潜在的な副作用について懸念していました。
The doctor explained that every drug comes with the risk of side effects, which is why it's important to monitor patients closely after starting a new treatment.
医者は、すべての薬には副作用（ふくさよう）のリスクが伴うため、新しい治療を始めた後は患者を注意深く監視することが重要だと説明しました。
02
副作用（ふくさよう）, 副産物（ふくさんぶつ）
a result of a situation or action that was not meant to happen
Example
The new policy aimed to boost economic growth, but an unintended side effect was increased inflation.
新しい政策は経済成長を促進することを目的としていましたが、意図しない副産物はインフレの増加でした。
The construction of the new highway led to a side effect of increased traffic in nearby residential areas.
新しい高速道路の建設は、近くの住宅地での交通量増加という副産物をもたらしました。
