What is rapid-acting insulin?

Rapid-acting insulin helps you limit the increase in blood sugar levels that happen when you eat.

When does rapid-acting insulin peak and how long is it active?

The onset for rapid-acting insulin is around 15 minutes, the peak is after 30 to 90 minutes, and the duration is between one and five hours.

When should I take rapid-acting insulin?

Rapid-acting insulin is taken right before a meal, either a few minutes before eating or right as you sit down to eat, to counter blood glucose elevation from your meal.

Which products should I look for?

The types of rapid-acting insulin currently available on the market are:

  • Humalog (generic name: lispro)
  • NovoLog (generic name: aspart)
  • Apidra (generic name: glulisine)
  • Afrezza (insulin inhalation)

Anything else I should know?

With all rapid-acting insulin, the onset action and the time of peak are similar, but the duration of the insulin is affected by the dose. This type of insulin is generally used with a longer-acting insulin.

Learn more about insulin:

Everything You Need to Know about Short-Acting Insulin
Everything You Need to Know About Intermediate Insulin
Everything You Need to Know About Long-Acting Insulin