How long does rapid-acting insulin generally last in the body?

Rapid-acting insulin is designed to start working quickly after administration, typically within 15 minutes, and its peak effect occurs approximately 1-2 hours post-injection. However, the duration of action for rapid-acting insulin generally lasts around 3-5 hours. This timeframe allows for effective management of blood glucose levels related to meals, as it helps counteract the postprandial rise in blood sugar that occurs after eating.

This characteristic makes rapid-acting insulin an essential component of meal-time insulin regimens for individuals with diabetes, ensuring that glucose levels are adequately controlled following food intake. Understanding the pharmacokinetics of rapid-acting insulin is key for optimizing diabetes management and preventing hypoglycemia or hyperglycemia that can result from incorrect dosing.