retatrutide phase 2 nejm 2023 obesity trial results SURPASS-2 (NEJM 2021) was the definitive head-to-head: tirzepatide vs semaglutide 1.0 mg (the maximum approved T2DM dose) in 1,879 patients with type diabetes. All three tirzepatide doses produced superior HbA1c reductions Among participants 4 to 66
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