甲の薬は乙の毒（こうのくすりはおつのどく）

Japanese vocabulary

Meaning: one man's meat is another man's poison; one man's medicine is another man's poison

See it used in real works

• Example sentences from Japanese novels & web fiction (Massif)
• Hear “甲の薬は乙の毒” pronounced in real videos (YouGlish)