Achieving and maintaining target values of glycemic control remains an urgent task in the treatment of patients with both type 1 diabetes mellitus (DM1) and type 2 diabetes mellitus (DM2). At the present stage, in addition to the glycated hemoglobin level, new indicators of glucose control have appeared associated with the introduction of the method of continuous glucose monitoring in patients. Particular attention is paid to the indicators of glycemic variability (GV). In DM1 patients, therapy with intermediate-acting insulins and their peak-acting analogues does not fully mimic endogenous insulin secretion, increases the risk of hypoglycemia and may be associated with an increased incidence of GV. DM2 patients more often require higher doses of insulin, the use of which is also associated with high GV. GV can be considered as a risk factor for hypoglycemia and vascular complications. The emergence of new-generation insulins with a long action that do not have an absorption peak can reduce GV. Insulin degludec (Tresiba®) is a long-acting basal insulin analogue (with an action duration of more than 42 hours), which was specially developed for low variability of action. This article considers a series of clinical cases of DM1 and DM2 patients being switched to insulin degludec therapy due to ineffective previous treatment with insulin detemir.

Keywords: degludec, basal insulin analogue, glycemic variability, diabetes mellitus