Exenatide, sold under the brand name Byetta and Bydureon among others, is a medication used to treat diabetes mellitus type 2.[1] It is used together with diet, exercise, and potentially other antidiabetic medication.[1] It is a less preferred treatment option after metformin and sulfonylureas.[2] It is given by injection under the skin within an hour before the first and last meal of the day.[1] A once-weekly injection version is also available.[1]