noun
vaccine side effect; adverse reaction to a vaccine
Medical term specifically for undesirable reactions following vaccination, distinct from general drug side effects (副作用).
ワクチン接種後の副反応として発熱や頭痛が報告されている。
Fever and headache have been reported as side effects after vaccination.
副反応が強い場合は医師に相談してください。
If you have a strong vaccine side effect, please consult a doctor.
noun
side reaction
Chemistry term for an unintended reaction that occurs alongside the main reaction.
この合成では副反応が多く、収率が低い。
In this synthesis, there are many side reactions, so the yield is low.