Optum Rx, one of America’s largest pharmacy benefit managers (PBMs) sent a letter to drug companies outlining several demands the companies must meet if they seek to lower list prices for their medicines. This would put another obstacles in the path of lowering drug prices.

The letter was sent to several drug manufacturers. In it, Optum demanded a couple of things: 1) at least seven quarters notice before a company reduces its list prices, and 2) equivalent rebates off of lowered prices as compared to existing prices. The message is unclear whether Optum wants rebates to stay the same or the same percentage of a price. But either way, drug companies are unhappy with the letter, since many companies are looking to lower list prices for certain drugs. Additionally the letter was high handed and Optum seems like it is attempting to dictate the terms of various projects.