Generic insulin glargine?

Short answer: there isn’t a true “generic” insulin glargine in the US. Insulins are biologics, so what you’ll see are biosimilars or other branded formulations.

Key options you might hear about:
- Lantus (insulin glargine) – the original brand.
- Basaglar (insulin glargine) – a biosimilar/follow-on to Lantus.
- Semglee (insulin glargine-yfgn) – a biosimilar to Lantus; FDA-approved as a biosimilar and, in some cases, designated interchangeable with Lantus (check with your pharmacist/doctor for substitution rules in your area).
- Toujeo (insulin glargine, 300 units/mL) – not a generic; a high-concentration branded version of insulin glargine with a different dosing/delivery profile.

Notes:
- In many places outside the US, you may also see Abasaglar or other names for glargine biosimilars.
- Substitution rules (whether a pharmacist can automatically switch) depend on country and state; talk with your clinician and pharmacist about switching.

If you’re considering switching for cost or coverage, tell me your country and any preferences (e.g., 100 U/mL vs 300 U/mL, brand vs biosimilar), and I can tailor the guidance and help you prepare questions for your prescriber. And as always, don’t switch insulin without consulting your healthcare provider.