Semaglutide 3mg is a prescription medication used to treat type 2 diabetes. It belongs to a class of drugs known as glucagon-like peptide-1 (GLP-1) receptor agonists, which work by increasing the amount of insulin that the body produces after eating. Semaglutide 3mg also helps decrease glucose production by the liver and increases feelings of fullness, leading to weight loss in some people with type 2 diabetes.