SHANNON SCOTT: "Vicodin was a stimulant for me. So I also used Vicodin as something to, you know, get my engine going and carry me through the day. And then my Xanax would, you know, balance me out and bring me down and relax me."

Joan Borsten heads the center. She says stopping is difficult because the drugs change the body's chemistry.

JOAN BORSTEN: "In the case of pain pills, the body has stopped producing its natural defenses to pain, and they just have to have more and more and more and more, and finally there's nothing else to take."

Around the country, special drug courts work with addicts to get them counseling and treatment. Mary Ann Gunn is a retired drug-court judge. She now appears on "Last Shot With Judge Gunn," a television program that shows the effect of drugs on users and their families.

MARY ANN GUNN: "For instance, in nineteen ninety-nine, the big problem was methamphetamine. And it was a cancer, if you will, throughout our country. And we have addressed that and are continuing to address it. And more and more over the years we began to see people being addicted to prescription drugs."

James Adams is a pharmacologist at the University of Southern California in Los Angeles. He says millions of people live with pain, much of it from arthritis caused by obesity and aging.

JAMES ADAMS: "And it's a real tough problem for a doctor because here you've got a patient with chronic pain, and these patients know exactly how to get what they want. And if that doctor doesn't give it to them, they just go to the next doctor."