The present invention relates to use of an extract ofAstragalus RadixandAngelica Radixfor treating lung cancer. In particular, according to the present invention, an extract ofAstragalus RadixandAngelica Radixis effective in reducing tumor growth and alleviating cachexia symptoms in a subject with lung cancer. The present invention also relates to use of an extract ofAstragalus RadixandAngelica Radixfor reducing side effects caused by an anti-cancer agent and a combination of an extract ofAstragalus RadixandAngelica Radixand an anti-cancer agent.本發明係關於一種黃耆與當歸之萃取物用於治療肺癌之用途。具體而言,根據本發明,黃耆與當歸之萃取物可有效抑制肺癌個體之腫瘤生長,同時減緩惡病質病症。本發明也關於一種黃耆與當歸之萃取物用於減少抗癌藥劑副作用的用途,以及一種黃耆與當歸之萃取物與抗癌藥劑的組合。