Enlarge (credit: https://www.uschemlabs.com/product/semaglutide-2mg-5-vials/) Buying counterfeit weight loss drugs from illegal online pharmacies that don't require prescriptions is, in fact, a very bad idea, according to a study published Friday in JAMA Network Open. The counterfeit drugs are sold as equivalents to the blockbuster semaglutide drugs, Ozempic and Wegovy, which are prescription only.