Effect of abuse-deterrent formulation of OxyContin.

To the Editor: In August 2010, an abuse-deterrent formulation of the widely abused prescription opioid OxyContin was introduced. The intent was to make OxyContin more difficult to solubilize or crush, thus discouraging abuse through injection and inhalation. We examined the effect of the abuse-deterrent formulation on the abuse of OxyContin and other opioids. Data were collected quarterly from July 1, 2009, through March 31, 2012, with the use of self-administered surveys that were completed anonymously by independent cohorts of 2566 patients with opioid dependence, as defined by the Diagnostic and Statistical Manual of Mental Disorders, 4th edition, who were entering treatment programs around the United States and for whom