Effects of Yizhiqingxin formula on learning and memory ability and intestinal flora of naturally aged rats

Objective To investigate the effects of Yizhiqingxin formula(YZQXF)on learning and memory ability and intestinal flora of naturally aged rats.Methods The natural aged rats with cognitive impairment were screened by Morris water maze(MWM).According to the method of stratified random,rats were divided into model group,donepezil hydrochloride group(0.45 mg/kg).