Notes: Naltrexone-d3 (Item No. 18325) is an analytical reference material intended for use as an internal standard for the quantification of naltrexone (Item Nos. ISO60192 / 15520) by GC- or LC-MS. Naltrexone is categorized as an opioid antagonist.{25130} Formulations containing naltrexone have been used in the treatment of alcohol dependence and in the prevention of relapse to opioid dependence. This product is intended for research and forensic applications.