Abstract: Objective To investigate metformin combined with insulin aspart 30 injection (NovoMix 30) in the treatment of type 1 diabetes mellitus (T1DM) in children and adolescents. Methods A total of 126 T1DM children over 10 years of age were randomly divided into insulin group (A) and insulin + metformin group (B). A group (n=60) was given insulin aspart 30 injection (insulin aspart 30), and B group (n=66) was given the metformin and insulin aspart 30 injection (NovoMix 30). Results The two groups can effectively control blood glucose, but the B group in the blood glucose control time, insulin dosage, the incidence of hypoglycemia, fasting blood glucose and hospitalization time were better than those of A group. There was no significant difference in liver and kidney function before and after oral administration of metformin in B group (P＞0.05). Conclusion Metformin combined with insulin is effective and safe in the treatment of children with T1DM.

Key words: Metformin, insulin, diabetes mellitus, type 1, child