Are glargine and lantus the same?

Yes—glargine is the generic name for a long‑acting insulin analog, and Lantus is one of the brand names for that same drug.
Lantus is the formulation sold by Sanofi (often called Humulin R in the U.S.). It contains the same active ingredient—human insulin glargine—as any other generic or brand version, so its pharmacologic effect, onset, duration, and dosing guidelines are essentially identical.

What can differ between Lantus and other glargine products are things like the excipients, vial size, packaging, and price. In clinical practice you’ll see prescriptions written for “insulin glargine” (generic) or for a specific brand, but the medicine itself is the same. Always follow your healthcare provider’s instructions for dosage and administration.