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Lantus (insulin glargine) is prescribed for the treatment of type 1 and type 2 diabetes. It works by supplying the body with insulin that is normally made in the body. This helps sugar travel from the blood into other important areas in the body where the sugar is used for energy. Lantus is available in the U.S. You can find discounts at local U.S. pharmacies by using the drug discount coupon search at the bottom of this page. Lantus sold in the U.S. is manufactured in Germany.