A trio of Democratic senators is encouraging the Food and Drug administration to pull ultra high-dose opioids from the market to help fight the opioid addiction crisis.

“Given the strength of a single dose of one of these opioids, it is shocking that such products remain on the market in the midst of our nation’s opioid epidemic,” Sens. Dick Durbin of Illinois, Joe Manchin of West Virginia, and Ed Markey of Massachusetts wrote in a letter to the FDA.