Preliminary randomized trial suggests metformin may prolong gestation in preterm pre-eclampsia.

Use of metformin to prolong gestation in preterm pre-eclampsia: randomised, double blind, placebo controlled trial – The BMJ

News release: Diabetes drug may help to prolong preterm pregnancies in women with pre-eclampsia – British Medical Journal

Commentary: Metformin May Prolong Gestation in Women With Preterm Preeclampsia – HealthDay

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