Introduction: To assess the efficacy and safety of insulin degludec administered in a basal-bolus regimen according to the GesTIO protocol in noncritical hospitalized patients with T1DM and T2DM. Methods: Mean blood glucose levels (BG) and their standard deviations (SD) at admission vs. discharge were compared in 52 subjects (48.1% ≥75 years) managed through a basal-bolus scheme including degludec. The percentages of patients with BG at target (140-180 mg/dl) or below at discharge and the incidence rate (and the 95% confidence interval for it) of hypoglycemia were assessed. Results: From admission to discharge, fasting BG decreased from 237 to 153 mg/dl ( p < 0.0001) and SD dropped from 125 to 38 mg/dl ( p < 0.0001); average BG decreased from 189 to 145 mg/dl (SD dropped from 57 to 32 mg/dl). At discharge, 28.9% had BG at target, while 50.0% had lower levels (average 119.0 ± 14.4 mg/dl). The incidence rate of hypoglycemia was 0.07 (0.05; 0.11) episodes per person-day; 1 out of 27 episodes occurred during the night. Conclusions: Degludec in hospitalized, mainly elderly patients is effective and minimizes glucose variability and nocturnal hypoglycemia. [ABSTRACT FROM AUTHOR]