Abstract
Before 1995, the only approved medications in the USA for the treatment of diabetes hyperglycemia were various insulin preparations and a number of sulfonylureas. Previously, the Food and Drug Administration (FDA) removed the biguanide phenformin from the market in 1977 due to its potential to induce fatal lactic acidosis. However, although almost every other country in the world was marketing metformin (which made its initial appearance in the 1950s), the patent for the drug had long since expired, leaving companies with little motivation to go through the registration process to bring metformin to the US market due to the immense possibility of generic copying.
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Skyler, J.S. (2012). Newer Diabetes Medications. In: Skyler, J. (eds) Atlas of Diabetes. Springer, Boston, MA. https://doi.org/10.1007/978-1-4614-1028-7_18
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