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Answer» What is Ultralente insulin mean? Ultralente insulin was a long-acting form of insulin. It has an onset of 4 to 6 hours, a peak of 14 to 24 hours, and a duration of 28 to 36 hours. Ultralente insulin, along with lente insulin, were discontinued in the US by manufacturers in the mid-2000s. One of the reasons for discontinuation was declining use in favor of NPH insulin and other newer insulin products. The FDA withdrew approval for ultralente insulin products by 2011. reference
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