Silver Book Fact
Prescription drug spending growth accelerated in 2006 to 8.5%, partly as a result of Medicare Part D’s impact.
Catlin, Aaron, Cathy Cowan, Micah Hartman, Stephen Heffler. National Health Spending In 2006: A Year Of Change For Prescription Drugs. Health Affairs. January 2008; 27(1): 14-29. http://content.healthaffairs.org/cgi/content/abstract/27/1/14