Which medication is classified as rapid-acting insulin?

Insulin aspart is classified as rapid-acting insulin due to its pharmacokinetic properties that allow for a quick onset of action. After subcutaneous injection, insulin aspart typically begins to work within 10 to 20 minutes, reaches its peak effect around 1 to 3 hours, and has a duration of action of about 3 to 5 hours. This rapid onset makes it especially effective in managing postprandial (after-meal) glucose levels.

In contrast, insulin detemir and insulin glargine are long-acting insulins. These types of insulin are designed to provide a steady release of insulin over an extended period, which is useful for maintaining baseline insulin levels throughout the day and night. Humulin Regular, while considered short-acting, is not classified as rapid-acting; it typically takes 30 minutes to an hour to start working, peaks around 2 to 3 hours, and lasts for about 5 to 8 hours. Thus, insulin aspart is uniquely positioned in that it provides rapid control of blood glucose spikes that occur immediately after meals.