Key TakeawaysEli Lilly has joined Johnson & Johnson in filing a lawsuit against the federal government over a decades-old drug discounting program.The companies have said the 340B program, which requires drugmakers to sell discounted medications to certain medical facilities, needs changes.The Health Resources and Services Administration, however, has rejected the companies' proposed changes to the program. Eli Lilly (LLY) became the second drugmaker in recent days to sue the U.S. government for rejecting t ...