Insulin Management for Dexamethasone-Induced Hyperglycemia

Basal Insulin Adjustment

For patients receiving high-dose glucocorticoids with two blood glucose readings >250 mg/dL, guidelines recommend initiating insulin at 1.0-1.2 units/kg per day, distributed as 25% basal and 75% prandial, according to the Lancet Diabetes and Endocrinology 1
Insulin requirements typically increase by 0.3-0.4 units/kg/day with dexamethasone-induced hyperglycemia, as stated by the Lancet Diabetes and Endocrinology 1
For hospitalized patients with poor oral intake and glucocorticoid use, the American Diabetes Association suggests starting with a reduced total daily dose of 0.1-0.15 units/kg/day given mainly as basal insulin, as recommended by Diabetes Care 2
A middle-ground approach of 0.3-0.4 units/kg basal insulin (20-26 units) is appropriate for patients with existing insulin use and high-dose dexamethasone, according to the Lancet Diabetes and Endocrinology 3 and 1

Withhold all scheduled prandial insulin when oral intake is poor, as recommended by the Lancet Diabetes and Endocrinology 3
Provide basal insulin coverage only, as this represents 30-50% of total daily insulin requirements, according to Diabetes Care 2
Use correction doses of rapid-acting insulin before meals or every 6 hours only if the patient actually eats, as suggested by the Lancet Diabetes and Endocrinology 3 and Diabetes Care 2

Blood glucose 180-220 mg/dL: 2 units rapid-acting insulin, as recommended by the Lancet Diabetes and Endocrinology 3
Blood glucose 221-260 mg/dL: 4 units rapid-acting insulin, as recommended by the Lancet Diabetes and Endocrinology 3
Blood glucose 261-300 mg/dL: 6 units rapid-acting insulin, as recommended by the Lancet Diabetes and Endocrinology 3
Blood glucose >300 mg/dL: 8 units rapid-acting insulin and notify physician, as recommended by the Lancet Diabetes and Endocrinology 3

Peak hyperglycemia occurs in afternoon and evening, 6-12 hours post-dose, as stated by the Lancet Diabetes and Endocrinology 1
Insulin requirements can decline rapidly after dexamethasone is stopped; reduce insulin doses by 20-30% immediately when steroids are discontinued, as recommended by the Lancet Diabetes and Endocrinology 1

Check blood glucose every 6 hours minimum, or before meals if eating, as recommended by the Lancet Diabetes and Endocrinology 3
Reassess insulin doses daily while on dexamethasone, as suggested by the Lancet Diabetes and Endocrinology 1
Target blood glucose 140-180 mg/dL in hospitalized patients, as recommended by the Lancet Diabetes and Endocrinology 3
If blood glucose consistently <100 mg/dL, reduce basal insulin by 20%, as recommended by Diabetes Care 2