Liraglutide, a lipopeptide and polypeptide, is an analogue of human GLP-1 in which the lysine residue at position 27 is replaced by arginine and a hexadecanoyl group attached to the remaining lysine via a glutamic acid spacer. It is used alongside diet and exercise to improve glycemic control in adults with type 2 diabetes mellitus. Liraglutide functions as a glucagon-like peptide-1 receptor agonist and serves as a neuroprotective agent.