One study published in April 2008 found that the percentage of Medicare beneficiaries who reported forgoing medications due to cost dropped after the implementation of Medicare Part D, from 15.2% in 2004 and 14.1% in 2005 to 11.5% in 2006.
A second study appearing in the same issue of JAMA found that not only did Medicare beneficiaries enrolled in Part D still skip doses or switch to cheaper drugs, many do not understand the program [REF].