Potential Risk Window for Opioid Overdose Related to Treatment with Extended-Release Injectable Naltrexone.
Potential Risk Window for Opioid Overdose Related to Treatment with Extended-Release Injectable Naltrexone.
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DOI:
10.1007/s40264-018-0705-8
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发表时间:
2018-10
期刊:
影响因子:
4.2
通讯作者:
Glanz JM
中科院分区:
文献类型:
--
作者:
Binswanger IA;Glanz JM
Extended-release (ER) injectable naltrexone (Vivitrol®) is a monthly injection approved for the treatment of opioid use disorder in the US. Other treatments for opioid use disorder include opioid agonists or partial agonists such as methadone and buprenorphine-containing products (eg buprenorphinenaloxone). As an opioid antagonist, naltrexone blocks the euphoric effects of opioids and may reduce the risk of opioid overdose once individuals are successfully induced into treatment [1]. However, paradoxically, the risk of opioid overdose may increase if individuals try to challenge the opioid blockade associated with naltrexone [2]. Two recent studies raise concerns about the susceptibility to opioid overdose associated with ER injectable naltrexone. In a randomized trial (n= 570) comparing the effectiveness of buprenorphinenaloxone with ER injectable naltrexone, 15 individuals had 18 overdose events in the ER injectable naltrexone arm, compared with 8 individuals who had 10 overdose events in the buprenorphine-naloxone group; the difference in the number of individuals with events was reported to be not statistically significant (p= 0.14), but the relative proportion of individuals with overdoses was nonetheless concerning (5.3% vs. 2.8%)[3]. An observational study in Western Australia demonstrated an elevated risk of fatal overdose among men treated with a different formulation of ER naltrexone (implant naltrexone), relative to men treated with methadone, but there was no difference when men and women were combined [4]. Overall, prior data about overdose risk associated with extended-release naltrexone is difficult to interpret due to inconsistent and poorly described procedures for ascertaining overdoses across studies [5]. A prior study also noted overdose events after discontinuing treatment with ER injectable naltrexone [3], perhaps due to loss of tolerance during treatment. Other medications for opioid use disorder are associated with an elevated risk of overdose after treatment discontinuation relative to ontreatment periods [3, 6]. This post-treatment overdose risk may be exacerbated if naltrexone results in upregulation of mu receptors, as suggested by animal studies [7, 8]. At present, there is a paucity of data comparing the post-treatment safety of ER injectable naltrexone with the post-treatment risk of methadone and buprenorphine. Safety data would help clinicians and patients make informed decisions among treatment options.
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