Almost half of all Americans use prescription drugs each monthNearly half of all Americans used at least two prescription drug per month in 2008, acco

Nearly half of all Americans used at least two prescription drug per month in 2008, according to a study by the Centers for Disease Control and Prevention, bloomborg reports. That's a 10 percent increase over the preceding decade. Over that time, yearly spending by Americans on drugs doubled to $234 billion. "The two biggest-sellers last year were Pfizer Inc.'s lipitor for high cholesterol and Bristol-Myers Squibb Co.'s clot-buster, Plavix. The rise of such medicines may continue as insurers add as many as 32 million customers through the U.S. health-care overhaul, according to the Congressional Budget Office"