THURSDAY, Sept. 2 (HealthDay News) -- The mystery of why some people are more likely to become addicted to opioid painkillers has been partially unraveled by the Geisinger Health System in Pennsylvania.
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Its researchers found that the group most vulnerable to addiction has four main risk factors in common: age (being younger than 65); a history of depression; prior drug abuse; and using psychiatric medications. Painkiller addiction rates among patients with these factors are as high as 26%.
For the study, they interviewed and analyzed DNA from 705 patients with back pain who were prescribed opioid painkillers -- a class that includes such narcotics as morphine and codeine -- for more than 90 days.
The researchers also studied a gene on chromosome 15 that has been linked with alcohol, cocaine and nicotine addiction. The data suggested that DNA mutations on a gene cluster on chromosome 15 may also be associated with opioid addiction.
"These findings suggest that patients with pre-existing risk factors are more likely to become addicted to painkillers, providing the foundation for further clinical evaluation," Joseph Boscarino, an epidemiologist and senior investigator at Geisinger's Center for Health Research, said in a health system news release.
"By assessing patients in chronic pain for these risk factors before prescribing painkillers, doctors will be better able to treat their patients' pain without the potential for future drug addiction," he added.
Boscarino and colleagues also said these same risk factors may increase the risk of drug addiction in patients without a history of chronic pain.
The study appears in the September issue of the journal Addiction.
-- Robert Preidt
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SOURCE: Geisinger Health System, Aug. 27, 2010, news release