Insulin Types Explained
Insulin is a hormone that helps the body use glucose for energy. Different types of insulin vary in how quickly they start working, when they peak, and how long they last. Understanding these differences can help tailor diabetes treatment to each person’s needs.
Onset → Duration Lanes
Rapid-acting (Analog)
Rapid-acting insulins start working within 10–15 minutes, peak at around 1–2 hours, and last about 3–5 hours. They are taken right before or immediately after meals.
Short-acting (Regular)
Short-acting (Regular) insulins start working within 30 minutes, peak around 2–4 hours, and last 6–8 hours. Usually injected 30 minutes before meals.
Intermediate-acting (NPH)
Intermediate-acting (NPH) insulins have onset of 1–2 hours, peak between 4–12 hours, and last up to 18 hours. Usually taken once or twice daily.
Long-acting (Basal)
Long-acting insulins have a slow onset and no pronounced peak, providing basal coverage for up to 24–42 hours. Used once daily for steady background insulin.
Premixed / Biphasic
Premixed insulins combine short- or rapid-acting with intermediate-acting components. Provide both meal and basal coverage in one injection.