Which insulin category would be most likely to achieve peak effectiveness fastest after injection?

Which insulin category would be most likely to achieve peak effectiveness fastest after injection?

• A. Short-acting
• B. Long-acting
• C. Rapid-acting
• D. Intermediate-acting

Answer: (C)

Understanding how insulin works involves looking at onset and peak. The insulin that reaches its maximum effect the fastest after injection is the rapid-acting type. It starts working in about 10–20 minutes and peaks in roughly 1–3 hours, which makes it ideal for covering meals and matching the post-meal glucose rise. In comparison, short-acting insulin begins later and peaks around 2–4 hours, long-acting provides a steady effect with no clear peak, and intermediate-acting has a later, longer peak. So the rapid-acting option is the one that achieves peak effectiveness the quickest.

Understanding how insulin works involves looking at onset and peak. The insulin that reaches its maximum effect the fastest after injection is the rapid-acting type. It starts working in about 10–20 minutes and peaks in roughly 1–3 hours, which makes it ideal for covering meals and matching the post-meal glucose rise. In comparison, short-acting insulin begins later and peaks around 2–4 hours, long-acting provides a steady effect with no clear peak, and intermediate-acting has a later, longer peak. So the rapid-acting option is the one that achieves peak effectiveness the quickest.