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Bolus Insulin: Action, Dosage & Application

Bolus insulin is a fast-acting insulin injected at mealtimes to control the rise in blood glucose levels after eating.

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Things worth knowing about "Bolus insulin"

Bolus insulin is a fast-acting insulin injected at mealtimes to control the rise in blood glucose levels after eating.

What is Bolus Insulin?

Bolus insulin is a type of insulin administered specifically at mealtimes to counteract the short-term rise in blood sugar that follows food intake. It belongs to the group of short-acting or rapid-acting insulins and is a key component of intensified insulin therapy, primarily used in people with type 1 diabetes and certain forms of type 2 diabetes.

Within the basal-bolus concept, bolus insulin is used alongside a long-acting basal insulin. While basal insulin covers the background insulin requirement throughout the day and night, bolus insulin addresses the mealtime-related insulin demand.

Mechanism of Action

Bolus insulin mimics the natural insulin secretion of the pancreas that occurs immediately after eating in healthy individuals. After injection, it lowers blood glucose by promoting the uptake of glucose into body cells and simultaneously suppressing glucose release from the liver.

Regular insulin (human insulin): Onset of action after approximately 30 minutes, duration of action 4–8 hours. Must be injected about 15–30 minutes before a meal.
Rapid-acting insulin analogues (e.g. insulin aspart, insulin lispro, insulin glulisine): Onset of action after approximately 10–15 minutes, duration of action about 2–4 hours. Can be injected directly before or even shortly after a meal.

Indications

Bolus insulin is used in:

Type 1 diabetes mellitus: Since the pancreas no longer produces insulin, complete insulin replacement is necessary.
Type 2 diabetes mellitus: When blood glucose control with oral antidiabetic agents and/or basal insulin is insufficient.
Gestational diabetes: If required for mealtime glucose control.
Hospitalised patients: For targeted blood glucose correction in clinical settings.

Dosage and Administration

The dosage of bolus insulin depends on several factors:

Carbohydrate content of the meal (calculated in carbohydrate portions or grams)
Current blood glucose level before the meal
Individual insulin sensitivity (correction factor)
Physical activity and time of day

Injection is typically subcutaneous (under the skin), commonly into the abdomen, thigh, or upper arm. When using an insulin pump (CSII), bolus insulin is delivered automatically or manually as a bolus.

Side Effects and Risks

The most important side effect of bolus insulin is hypoglycaemia (low blood sugar), which can occur when:

the dose is too high,
a meal is skipped or smaller than planned,
unusual physical exertion takes place.

Other potential side effects include lipodystrophy (changes in fat tissue at the injection site) from repeated injections at the same location, as well as local skin reactions.

Bolus Insulin in Daily Life

For people with diabetes, correctly managing bolus insulin is an essential part of self-management. Diabetes education programmes help individuals calculate doses individually and adapt them to various life situations. Modern tools such as continuous glucose monitoring (CGM) systems and insulin pumps greatly simplify glucose management.

References

American Diabetes Association (ADA): Standards of Medical Care in Diabetes. Diabetes Care, 2023.
Holt RIG, DeVries JH, Hess-Fischl A et al. - The Management of Type 1 Diabetes in Adults. A Consensus Report by the ADA and the EASD. Diabetes Care, 2021.
World Health Organization (WHO): Classification of Diabetes Mellitus. Geneva: WHO, 2019.

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