Study finds prescription drug use doubles between 1999 and 2008.
Americans are taking more prescription drugs than ever.
A new report from the National Center for Health Statistics finds prescription drug spending reached $234-billion in 2008.
That's more than double what was spent in 1999.
The new data are from 2007 and 2008, the most recent years for which information is available.
During those years one out of every five children was taking at least one prescription drug, most commonly asthma drugs.
90-percent of older Americans were taking a prescription medication, mostly cholesterol drugs.