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The aim of this study was to observe the changes in glucose metabolism after antipsychotic(APS)therapy,to note the influencing factors,as well as to dicuss the relationship between the occurrence of glucose metabolism disorders of APS origin and abnormal glycosylated hemoglobin(HbA1c)levels.One hundred and fifty-two patients with schizophrenia,whose fasting plasma glucose(FPG)and 2-h plasma glucose (2hPG)in the oral glucose tolerance test(2HPG)were normal,were grouped according to the HbA1c levels,one normal and the other abnormal,and were randomly enrolled into risperidone,clozapine and chlorpromazine treatment for six weeks.The FPG and 2hPG were measured at the baseline and at the end of the study.In the group with abnormal HbA1c and clozapine therapy,2HPG was higher after the study[(9.5±1.8)mmol/L]than that before the study[(7.2±1.4)mmol/L]and the difierence was statistically significant(P＜0.01).FPG had no statistically significant difference before and after the study in any group(P＞0.05).HbA1c levels and drugs contributing to 2HPG at the end of study had statistical cross-action(P＜0.01).In the abnormal HbA1c group,2HPG after the study was higher in the clozapine treatment group [(9.5±1.8)mmol/L]than in the risperidone treatment group [(7.4±1.7)mmol/L]and the chlorpromazine treatment group[(7.3±1.6)mmol/L].The differences were statistically significant(P＜0.01).In the normal HbA1c group there was no statistically significant difierence before and after the study in any group(P＞0.05).2HPG before[(7.1±1.6)mmol/L]and after the study[(8.1±1.9)mmol/L]was higher in the abnormal HbA1c group than in the normal HbA1c group[(6.2±1.4)mmol/L vs(6.5±1.4)mmol/L]with the difierence being statistically significant(P＜0.01 vs P＜0.001).As compared with normal HbA1c group,the relative risk (RR)of glucose metabolism disease occurrence was 4.7 in the abnormal HDA1C group wlth the difierence being statistically significant(P＜0.001).Patients with abnormal HbA1c are more likely to have a higher risk of having glucose metabolism disorders after APS treatment.