Lantus (insulin glargine) is a long-acting insulin designed to help individuals with diabetes maintain stable blood sugar levels throughout the day and night. With a once-daily injection, Lantus provides steady, long-lasting glucose control, reducing the risk of dangerous blood sugar spikes and crashes.br br If you have type 1 diabetes or type 2 diabetes, Lantus may be a game-changer in your treatment plan. Always consult with your healthcare provider to see if Lantus is right for you.