FILE - In this Dec. 12, 2007 file photo, Tylenol drugs are shown in the drug department at Costco in Mountain View, Calif. According to national surveys of parents and sixth-graders, tweens got a failing grade for knowledge about the proper use of over-the-counter medicines. Only about half knew such medicines can be dangerous when improperly used or mixed with other drugs. (AP Photo/Paul Sakuma, File)