Insulin aspart !
A rapid-acting insulin analogue for meals and pumps. One amino acid change lets it break apart and enter the blood quickly.
Updated 2026-11-01
The figure shows human insulin bound to site 1 of an insulin receptor fragment. Aspart differs only at B28 and binds the same site.
Mechanism of action
In insulin aspart the proline at B28 is replaced by aspartic acid. The added negative charge reduces self-association, so the hexamers dissociate rapidly into monomers after injection and are absorbed faster than regular insulin. Once in the blood it acts on the insulin receptor exactly like human insulin.
- Aspartate at B28 reduces self-association
- Monomers are absorbed rapidly from under the skin
- Activates the insulin receptor like human insulin
- Covers the glucose rise of a meal
Pharmacokinetics
- Absorption
- Subcutaneous, faster than regular insulin; intravenous use only under medical supervision.
- Half-life
- Apparent half-life after a subcutaneous injection of about 81 minutes in the label's study.
- Onset and duration
- Injected 5 to 10 minutes before a meal; the greatest glucose-lowering effect occurs between 1 and 3 hours after injection.
Indications
- Mealtime and correction insulin in type 1 diabetes, by injection or pump Type 1 diabetes mellitus →
- Mealtime insulin in type 2 diabetes Type 2 diabetes mellitus →
Adverse effects
Common
- Hypoglycemia
- Weight gain
- Injection-site reactions and lipodystrophy
- Low potassium
Contraindications
- During an episode of hypoglycemia
- Hypersensitivity to insulin aspart or an excipient
Key interactions
- Beta-blockers, clonidine
- Can blunt the warning signs of hypoglycemia.
- Other glucose-lowering drugs
- Raise the risk of hypoglycemia.
- Corticosteroids, diuretics, atypical antipsychotics, niacin
- Reduce the glucose-lowering effect.
- Thiazolidinediones (pioglitazone)
- Fluid retention and possible heart failure.
What is monitored
- Blood glucose before and after meals
- Glucose and potassium closely during intravenous use
- HbA1c
- Pump and injection sites
Administration and safety
- Subcutaneous injection shortly before a meal, or continuous subcutaneous infusion by pump.
- Intravenous use only under medical supervision, with close checks of glucose and potassium.
- In a pump it is not diluted or mixed with other insulins.
- Look-alike risk with premixed aspart products: the label is checked before every dose.
Nursing care
- Before: blood glucose and confirmation that the meal is available.
- After: watch for hypoglycemia in the first hours.
- Review the dose with the team if the patient cannot eat.
- Teach pump users to recognize pump failure and to have a backup injection plan.
Pregnancy and breastfeeding
Rapid analogues such as aspart are used in pregnancy; insulin needs change by trimester and glucose is checked often.
Test yourself
Think of the answer, then tap the question to see it.
Which single change makes insulin aspart rapid acting?
Proline B28 is replaced by aspartic acid, which reduces self-association so the insulin dissociates quickly into monomers.
When does aspart's glucose-lowering effect peak after a subcutaneous injection?
Between about 1 and 3 hours after the injection.
What extra monitoring is needed when aspart is given intravenously?
Close blood glucose and potassium monitoring, under medical supervision, to avoid hypoglycemia and hypokalemia.
Related drugs
Related conditions
Educational content on how drugs work; not a prescribing guide and no substitute for a health professional's advice. No doses are given.
Sources: Insulin Aspart (rDNA Origin) Injection: MedlinePlus Drug Information (MedlinePlus (U.S. National Library of Medicine), 2025); DailyMed - INSULIN ASPART injection, solution (DailyMed (U.S. National Library of Medicine), 2026); Goodman & Gilman's The Pharmacological Basis of Therapeutics, 14th ed., ch. 51 (McGraw Hill, 2023); ATCDDD - ATC/DDD Index (WHO Collaborating Centre for Drug Statistics Methodology, 2026).
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Representative model, for educational purposes only.