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

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’s legal actions against Empower Pharmacy and other compounding pharmacies come several months after the FDA announced that a shortage of Mounjaro and Zepbound had been resolved.