Sales of the nation's two most popular prescription painkillers have exploded in new parts of the country, an Associated Press analysis shows, worrying experts who say the push to relieve patients' suffering is spawning an addiction epidemic.

From New York's Staten Island to Santa Fe, Drug Enforcement Administration figures show dramatic rises between 2000 and 2010 in the distribution of oxycodone, the key ingredient in OxyContin, Percocet and Percodan. Some places saw sales increase sixteenfold.

Meanwhile, the distribution of hydrocodone, the key ingredient in Vicodin, Norco and Lortab, is rising in Appalachia, the original epicenter of the painkiller epidemic, as well as in the Midwest.

The increases have coincided with a wave of overdose deaths, pharmacy robberies and other problems in New Mexico, Nevada, Utah, Florida and other states.

Opioid pain relievers, the category that includes oxycodone and hydrocodone, caused 14,800 overdose deaths in 2008 alone, and the death toll is rising, the Centers for Disease Control and Prevention says.