Soliqua is a combination of insulin glargine plus lixisenatide, and Lantus only contains insulin glargine. Both are once-daily injections that are given under the skin (subcutaneously), but Soliqua can only be used in adults with type 2 diabetes whereas Lantus may be used to treat both type 1 and type 2 diabetes in adults and children over the age of six years. Both are made by Sanofi-Aventis.