Provided is an injection composition which includes diclofenac beta-dimethylaminoethanol as an active component, wherein the concentration of diclofenac beta-dimethylaminoethanol is in a range from 80 mg/mL to 100 mg/mL, and an osmotic pressure is in a range from 100 mosmol/L to 2500 mosmol/L.COPYRIGHT KIPO 2015본 발명은 디클로페낙 베타디메틸아미노에탄올을 유효 성분으로 포함하되, 상기 디클로페낙 베타 디메틸아미노에탄올의 농도가 80 mg/mL 내지 100 mg/mL 범위이고, 삼투압이 100 mosmol/L 내지 2500 mosmol/L 범위인 주사제 조성물을 제공한다.