Abstract
Metformin has been recommended as first-line pharmacological therapy in type‑2 diabetes (T2D) since 1998. It was the first medication that demonstrated cardiovascular benefits in obese subjects with T2D. Efficacy and safety of metformin have since been demonstrated in further studies and in real-world data on its use in practice. The recommendation of metformin as baseline therapy has reached wide acceptance internationally. During the period 2015-2021, large cardiovascular safety trials showed superiority for cardiovascular morbidity and partly also mortality outcomes for most substances of the novel antidiabetic substance classes of GLP‑1 receptor agonists and SGLT‑2 inhibitors in people with T2D and very high cardiovascular risk or preexisting cardiovascular disease. The evidence for these two substance classes is now broader than for metformin. Therefore, the question arises as to whether it is still justified to recommend metformin generally as first-line therapy in T2D. This article provides an overview of the study data as well as an overview of the evidence-based guidelines. The status and position of metformin in the treatment of T2D are discussed.
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