What type of insulin is known as long acting insulin?

Ultralente insulin is considered long-acting because it is designed to provide prolonged blood glucose control over an extended duration. It has a slower absorption rate compared to other forms of insulin, resulting in a longer peak action and extended duration of effect. Ultralente can last up to 24 hours or more, making it suitable for maintaining basal insulin levels throughout the day.

In contrast, regular insulin is classified as short-acting, typically effective for a few hours. Lente insulin is an intermediate-acting form, though it is not used as commonly today. NPH insulin, also an intermediate-acting insulin, has a shorter duration than ultralente and peaks sooner.

Thus, ultralente is uniquely positioned as a long-acting insulin type, providing the essential feature of sustained release necessary for effective long-term blood glucose management.