Basaglar contains insulin glargine, a long-acting insulin that provides background glucose control. It is supplied at U-100 concentration in prefilled pens.
The approved uses and formulations described here follow US prescribing information. They may differ in other countries.
| Medicine detail | Details |
|---|---|
| Active ingredient(s) | insulin glargine |
| Medicine class | Long-acting basal insulin |
| Forms and strengths | U-100 solution in 3 mL KwikPen or Tempo Pen |
Basal insulin and approved use
The US label covers improvement of glucose control in adults and children with type 1 diabetes and adults with type 2 diabetes. Basaglar provides long-acting background insulin; it is not intended to treat diabetic ketoacidosis. People using it for type 1 diabetes also need an appropriate mealtime insulin plan.
Source: [1]
Pen strength and contents
Basaglar is U-100, meaning 100 units per mL. Each 3 mL KwikPen or Tempo Pen contains 300 units before use and priming. The prescribed number of units is injected once daily at the same time each day; the total contents of the pen are not a single dose.
Source: [1]
Important insulin precautions
Hypoglycemia can be severe, and insulin can lower potassium. Do not mix or dilute Basaglar or share a pen, even after changing the needle. A change of insulin regimen needs clinical supervision and closer glucose monitoring; a familiar ingredient name does not make every concentration or device interchangeable.
Source: [1]
Using the prescribed pen
Follow the instructions for the pen you receive, including injection technique, site rotation, storage and when to discard it after first use. If the device or product name changes unexpectedly at a refill, ask the pharmacist to check it against the prescription before using it.
Source: [1]
Other insulin glargine products
Lantus also contains insulin glargine. A change between glargine products still requires attention to concentration, device, prescribing information and local substitution rules. The prescribing team should explain any change and the glucose monitoring needed during the transition.
Source: [1]
Questions and answers
Is Basaglar a mealtime insulin?
No. It is a long-acting basal insulin, with a different role from rapid-acting mealtime products.
Is Basaglar U-100 or U-300?
The Basaglar label specifies U-100. Other glargine products may have different concentrations.
Can Basaglar pens be shared after changing the needle?
No. A pen is for one person only.
Related reading
Sources
Sources checked 1 October 2026. This information does not replace advice from your healthcare professional. For complete warnings and instructions, read the product information and consult the prescribing team.
Reviewed by: Mattias Hagman, PhD
About the reviewer:
Dr Mattias Hagman (PhD, University of Sydney) has an academic background and experience working with healthcare-related content and regulated industries. He has lecturing experience at international universities, including Stockholm University and the University of Malta.
Last reviewed: October 2026