Usual initial gestational diabetes mellitus (GDM) care (ie, medical nutritional therapy, exercise) may result in a few weeks of hyperglycemia before a need for pharmacotherapy is established. In a randomized trial evaluating whether initiating metformin at the time of GDM diagnosis regardless of glycemic control improves clinical outcomes compared with usual care, the metformin group had a lower rate of insulin initiation and favorable trends in mean fasting glucose, gestational weight gain, and excessive fetal growth, but more births <2500 grams [1]. Rates of preeclampsia, neonatal intensive care unit admission, and neonatal hypoglycemia were similar for both groups. Given these mixed results, we recommend not initiating metformin at the time of GDM diagnosis except in a research setting.
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