In 2007, approximately 27,000 unintentional drug overdose deaths occurred in the United States, one death every 19 minutes. Prescription drug abuse is the fastest growing drug problem in the United States. The increase in unintentional drug overdose death rates in recent years has been driven by increased use of a class of prescription drugs called opioid analgesics.
via CDC Grand Rounds: Prescription Drug Overdoses — a U.S. Epidemic.