Since Zepbound was approved by the FDA to treat obesity in late 2023, its maker Eli Lilly has been steadily closing in on fierce rival Novo Nordisk’s early lead in the obesity market.

The lawsuit in question concerns the FDA’s decision to officially declare the shortages of Mounjaro and Zepbound, both forms of the GLP-1 drug tirzepatide, to be over in October. The suit was ...