Optimizing Insulin Regimens

Introduction to Insulin Optimization

• The American Diabetes Association recommends advancing to combination injectable therapy with GLP-1 receptor agonists or adding prandial insulin when basal insulin has been initiated and A1C remains above target 1, 2

Assessing and Optimizing Basal Insulin

• Evaluate whether the basal insulin dose is appropriate by checking for signs of overbasalization: basal dose >0.5 units/kg, large bedtime-to-morning glucose differential (≥50 mg/dL), or hypoglycemia 1
• If overbasalization is present, consider reducing the basal insulin dose rather than adding another medication 1

Optimizing Prandial Insulin Regimens

• Implement proper carbohydrate counting with an individualized insulin-to-carbohydrate ratio (e.g., 1:10 or 1:15) plus correction factor dosing 3
• This allows flexible, meal-specific dosing rather than fixed doses, which improves glycemic control without adding medications 1

Intensification Strategies

• If the basal insulin dose exceeds 0.5 units/kg/day and A1C remains above target, add a GLP-1 receptor agonist rather than glipizide 1, 4
• The American Diabetes Association recommends considering GLP-1 receptor agonists as an intensification strategy when basal insulin is not sufficient 1, 2

Avoiding Critical Pitfalls

• Do not add sulfonylureas to patients already on basal-bolus insulin regimens—this increases hypoglycemia risk without addressing the underlying issue of inadequate insulin dosing or timing 2
• Do not decrease the carbohydrate ratio arbitrarily; instead, calculate it based on the total daily insulin dose (typically 500 rule: 500 ÷ total daily dose = grams of carbohydrate covered by 1 unit) 3