Semaglutide acts as a selective agonist for the glucagon-like peptide-1 (GLP-1) receptor, activating the GLP-1 signaling pathway, which enhances insulin secretion in a glucose-dependent manner, inhibits glucagon release, and promotes satiety. This receptor activation leads to downstream effects such as increased cyclic AMP (cAMP) levels, activation of protein kinase A (PKA), and modulation of gene expression involved in glucose metabolism and appetite regulation. While the overall mechanism is well-characterized, some aspects of its long-term effects on metabolic pathways remain to be fully elucidated.