Semaglutide is a medication that belongs to a class of drugs called GLP-1 receptor agonists. It works by mimicking the action of a naturally occurring hormone in the body called glucagon-like peptide-1 (GLP-1), which helps regulate blood sugar levels and appetite. In medical weight loss, semaglutide is used to help individuals with obesity or overweight who have other weight-related conditions lose weight by reducing appetite, increasing feelings of fullness, and improving overall metabolic health. It's typically administered as a once-weekly injection and may be used in conjunction with diet and exercise to achieve and maintain weight loss goals.