A group representing companies that made copycat versions of Eli Lilly & Co.’s weight-loss drugs sued the US Food and Drug Administration over the agency’s decision to remove Lilly’s medications from its shortage list.

With an estimated 2 million people in the United States taking copycat vers | A compounding industry group has sued the FDA, claiming its action to remove Eli Lilly’s Mounjaro and Zepbound from its drug shortage list is a “reckless and arbitrary decision—lacking any semblance of lawful process.

The U.S. Food and Drug Administration removed Eli Lilly's blockbuster weight-loss and diabetes drugs from its shortage list late on Wednesday, likely piling pressure on firms selling cheaper versions known as compounded drugs.