Semaglutide is a medication used to treat type 2 diabetes, overweight, and obesity. It belongs to a class of drugs called glucagon-like peptide-1 (GLP-1) receptor agonists. These drugs work by mimicking the action of a hormone called GLP-1, which helps regulate blood sugar levels. Semaglutide helps lower blood sugar levels by stimulating insulin release, slowing down stomach emptying, and reducing appetite.