Insulin is divided into 5 types: rapid-acting, short-acting (or fast acting), intermediate-acting, long-acting and pre-mixed insulin. The different types of insulin vary in the amount of time until they begin to work (onset), how long they take to achieve the greatest blood concentration and effectiveness (peak) and how long they continue to control blood sugar (duration). The effects of insulin, including onset, peak and duration times, vary from individual to individual and from day to day.
Depending on the brand, rapid-acting insulin has an average onset of from 5 to 15 minutes, peak of 30 minutes to 3 hours, and duration of 3 to 5 hours. It’s normally injected with meals, and used in combination with a longer acting insulin.
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