AIM: To compare the efficacy and safety of oxiracetam and donepezil in treating Alzheimer disease with mild and moderate MMSE scores.METHODS: 68 patients were randomly divided into oxiracetam group(p.o.,n=34) and donepezil group(p.o.,n=34).The MMSE and Blessed-Roth measuring scales were used to evaluate the curative effects before treatment and three months after treatment.RESULTS: There were significant differences between the indexes expect for activities of daily living before and after treatment in two groups(P0.05).CONCLUSION: The curative effect and safety of oxiracetam and donepezil in treating mild and moderate Alzheimer disease are similar.