Eli Lilly is suing four telemedicine companies selling compounded versions of its blockbuster obesity drug Zepbound and its diabetes treatment Mounjaro, escalating its battle against unauthorized sellers,

Pharmaceutical giant Eli Lilly alleges the companies are selling illegal off-brand versions of its best-selling diabetes and weight-loss drugs, Mounjaro and Zepbound.

Eli Lilly is suing four telehealth companies that prescribe compounded versions of the pharmaceutical company's weight loss medications. Lilly filed four lawsuits on Wednesday claiming telehealth companies were misleading consumers and illegally prescribing compounded versions of its glucagon-like peptide-1 agonist drugs Mounjaro and Zepbound.