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Aims MK‐1293 is an insulin glargine that has an amino acid sequence identical to that of Lantus, the originator insulin glargine. Two euglycaemic clamp studies, 1 in subjects with type 1 diabetes (T1D) and 1 in healthy subjects, were conducted to demonstrate pharmacokinetic (PK) and pharmacodynamic (PD) similarity between MK‐1293 and Lantus commercially procured in both the European Union (EU‐Lantus) and the USA (US‐Lantus). Materials and Methods Both studies were single‐dose, randomized, double‐blind, single‐centre, crossover studies with ≥7 days between dosing periods. A 2‐treatment, 4‐period replicate crossover study in T1D subjects (N = 76) compared the PK and PD of MK‐1293 to EU‐Lantus for 30 hours after dosing. A 3‐period crossover study in healthy subjects (N = 109) compared the PK and PD of MK‐1293, EU‐Lantus and US‐Lantus for 24 hours after dosing. In both studies, all subjects received single 0.4 units/kg subcutaneous doses of MK‐1293 or Lantus in all dosing periods. Pharmacokinetic assessment was based on LC‐MS/MS‐based measurement of the major insulin glargine metabolite (M1) and PD was characterized using the euglycaemic clamp platform. Results In both studies, pre‐specified similarity criteria were met between MK‐1293 and Lantus for comparison of PK (AUC0‐24 and Cmax of M1) and PD (GIR‐AUC0‐24, GIR‐AUC0‐12, GIR‐AUC12‐24, and GIRmax) primary endpoints. All treatments were well tolerated. Conclusion Based on comparative assessment in both T1D and healthy subjects, it can be concluded that the PK and PD properties of MK‐1293 are highly similar to those of Lantus. (ClinicalTrials.gov: NCT02059174).