SAN DIEGO – High-dose opioid prescribing is associated with an increased risk of heroin use among U.S. veterans, a prospective study showed.
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“Despite evidence linking increased risk of opioid use disorder with specific opioid prescribing patterns, the relationship between these practices and heroin use is less understood,” researchers led by Geetanjoli Banerjee wrote in an abstract presented during the annual meeting of the College on Problems of Drug Dependence. “Understanding the relationship between prescription opioid use and initiation of heroin use among veterans is particularly important, as this population has both a higher underlying prevalence of substance abuse disorders and pain conditions.”
Ms. Banerjee, a graduate student at Brown University, Providence, R.I., and her associates examined data from 3,570 individuals enrolled in the Veterans Aging Cohort Study without nonmedical use or prescription opioids or heroin use in the year prior to baseline, and who received more than one prescription opioid from the VA during follow-up. between 2002 and 2012.
Among the 3,833 eligible participants, the proportion who were prescribed high-dose opioids (defined as a morphine equivalent daily dose of 90 mg or greater) did not change significantly between 2002 and 2012, and ranged from 4.4% to 5.9% (P = .22). The researchers also found that the 10-year incidence rate of recent heroin use was 8.15 event per 1,000 person-years. The time to recent heroin use differed significantly between participants with and without prior receipt of a high-dose prescription at baseline (P less than .001). Multivariable Cox regression analysis showed that prior receipt of a high-dose opioid prescription was associated with recent heroin use (adjusted hazard ratio, 2.54).
“Among patients who report no past year illicit use of opioids at baseline and who are receiving prescription opioids from the VA, receipt of high-dose prescription opioid increased the risk of subsequent heroin use,” the researchers concluded. “Patients receiving high-dose opioids, ages 50-56, with a history of HCV infection, injecting, opioid use disorder, or recent stimulant use should be screened for heroin use.”
They acknowledged certain limitations of the study, including its self-reported design and the fact that VA pharmacy data do not capture opioid prescriptions filled outside of the VA.
The study was funded by the National Institute on Alcohol Abuse and Alcoholism and the National Institute on Drug Abuse. Ms. Banerjee reported having no financial disclosures.