How No Surprises Act works, home care, peptides: DC Diagnosis A bipartisan group of lawmakers is urging the FDA to plug a loophole used to import knockoff retatrutide, an investigational obesity drug made by Eli Lilly. A bipartisan group of lawmakers is urging the FDA to plug a loophole used to import knockoff retatrutide, an investigational obesity drug made by Eli Lilly.