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Medicines

Basal insulin

Basal insulin is the background insulin your body needs around the clock, between meals and overnight, whether or not you eat.

Also called
background insulin, basal dose, basal rate
Formerly called

What it means

In people without diabetes, the pancreas releases a small, continuous amount of insulin all day and night. Basal insulin replaces that. On injections it is usually a long-acting insulin taken once a day, or sometimes twice. An insulin pump gives basal insulin as a slow, continuous flow of rapid-acting insulin, and the rate can be set differently for different times of day.

The basal dose is set so that glucose stays fairly steady overnight and between meals. Getting it right first makes meal-time doses more predictable. Basal insulin on its own is a common way to start insulin in type 2 diabetes.

At PDC Health Hub
PDC Health Hub's Credentialled Diabetes Educators support people starting and adjusting insulin.

Sources and clinical review

Clinically reviewed by
Jeffery Au
Last reviewed:
November 5, 2026
Next review due:
November 1, 2027

Questions about what this means for you?

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