Which type of insulin has the quickest onset of action?

Insulin Lispro is an example of a rapid-acting insulin, known for its rapid onset of action. This type of insulin typically starts to work within 15 minutes after injection, making it especially beneficial for managing postprandial (after meal) blood glucose levels. Rapid-acting insulins like Lispro are designed to mimic the body's natural insulin response to food intake, allowing for better glycemic control right after meals.

In contrast, other insulin types have different properties and onset times. For example, Insulin Glargine is a long-acting insulin with a slow onset, taking several hours to reach its peak effect, and maintaining stable insulin levels throughout the day and night. Insulin Detemir is also long-acting, offering a duration of action that can last up to 24 hours but similarly has a slow onset compared to Lispro. Insulin NPH (Neutral Protamine Hagedorn) is an intermediate-acting insulin, which has a delayed onset of action, typically between 1 to 2 hours.

Therefore, when considering the need for rapid control of blood glucose levels immediately after meals, Insulin Lispro stands out as the insulin with the quickest onset, providing a crucial tool in diabetes management.