75 % of deaths from prescription drugs are from pain killer overdoses, and a lot of the rest are from taking someone elses meds.
http://www.foxnews.com/health/2011/11/01/prescription-drug-deaths-skyrocket/
The No. 1 Cause of Accidental Death in the U.S. - Are You at Risk? By Dr. Mercola - November 24 2011
http://articles.mercola.com/sites/articles/archive/2011/11/24/modern-medicine-disease-treatments.aspx?e_cid=20111124_DNL_art_1
The whole article is a good read.