U.S. Sen. Ron Wyden wants answers from the two federal agencies about the nearly year-long national shortage of Adderall, prescribed to over 41 million Americans to treat attention deficit hyperactivity disorder (ADHD). The Oregon Democrat wrote June 2 to Anne Milgram, administrator of the U.S. Drug Enforcement Administration, and Robert Califf, Commissioner of the U.S. Food and Drug Administration, telling them their responses following an April meeting with were unsatisfactory.