The present invention is to provide uses of the L-oxiracetam in preparation of medicines for preventing or treating coma. Experimental results show that L-oxiracetam wake-promoting effects of alcoholism-induced coma is obvious, and D-oxiracetam has basically no effect. The effect of the above wake-promoting effects of L-oxiracetam is 2 times greater than racemic oxiracetam. The wake-promoting effects of L-oxiracetam on trauma or anesthesia-induced coma are both significant.
