When should regular insulin be administered in relation to meals?

Regular insulin is typically administered 30 minutes before a meal to allow the medication to take effect and help manage blood glucose levels effectively during and after the meal. This timing is crucial because regular insulin, also known as short-acting insulin, begins to lower blood sugar levels within 30 minutes after administration, reaches its peak around 2 to 3 hours, and can last for approximately 6 to 8 hours.

By administering insulin in advance, patients can better control their postprandial (after meal) blood glucose levels. This pre-meal timing helps to match the insulin action with the anticipated glucose absorption from the food being consumed, promoting stable blood sugar levels after eating.

Understanding the pharmacokinetics of regular insulin is essential for managing diabetes and ensuring that patients maintain their glycemic control effectively.