Insulin glargine-aglr (Rezvoglar – Lilly), which was approved by the FDA as a biosimilar to the reference product Lantus in 2021 and received interchangeability status with Lantus in 2022, will become available in the US on April 1, 2023. It is the second biosimilar insulin product to be designated as interchangeable with Lantus; Semglee was the first. Rezvoglar did not receive interchangeability status with Lantus at the time of its initial approval because the manufacturer of Semglee had exclusivity for 12 months.

Insulin glargine-yfgn (Semglee – Viatris), a follow-on insulin glargine product, has now received interchangeability status with the reference product Lantus from the FDA. It is the first biosimilar insulin product to receive this designation in the US. Now a pharmacist can substitute Semglee for Lantus as a lower-cost alternative without permission from the prescriber.

The FDA has approved Semglee (Mylan), an insulin glargine product similar to Lantus, for treatment of type 1 diabetes in children and adults and type 2 diabetes in adults. Semglee is the second "follow-on" insulin glargine product to become available in the US; Basaglar, which is also similar to Lantus, was the first. Lantus is a recombinant analog of human insulin that forms microprecipitates in subcutaneous tissue, prolonging its duration of action to a mean of about 24 hours with no pronounced peak effect.