WashU Medicine Mar 4 2026 Researchers at Washington University School of Medicine in St. Louis show in a new study that GLP-1 medications may be effective at treating and preventing substance use disorders across all major addictive substances studied, suggesting these drugs target a common biological pathway underlying addiction.  From their beginnings as a treatment for type 2 diabetes, GLP-1 receptor agonists such as semaglutide and tirzepatide have seen an explosion in use, most popularly