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Eli Lilly and Company, doing business as Lilly, is an American multinational pharmaceutical company headquartered in Indianapolis, Indiana, with offices in 18 countries. Its products are sold in approximately 125 countries. The company was founded in 1876 by Eli Lilly, a pharmaceutical chemist and Union army veteran during the American Civil War for whom the company was later named. Lilly was the first company to mass-produce both the polio vaccine, developed in 1955 by Jonas Salk, and insulin. It was one of the first pharmaceutical companies to produce human insulin using recombinant DNA, including Humulin (insulin medication), Humalog (insulin lispro), and the first approved biosimilar insulin product in the US, Basaglar (insulin glargine). It achieved commercial success with major depressive disorder drugs Prozac (fluoxetine) (1986), Cymbalta (duloxetine) (2004), and its antipsychotic medication Zyprexa (olanzapine) (1996), all of which are now off patent and are manufactured by others as generic drugs. In 2005, Lilly brought exenatide to market—the first of the GLP-1 receptor agonists—followed by the GIP and GLP-1 receptor agonist drugs Mounjaro and Zepbound (tirzepatide).