PMID- 24107112 OWN - NLM STAT- MEDLINE DCOM- 20151022 LR - 20161020 IS - 1521-0391 (Electronic) IS - 1055-0496 (Linking) VI - 23 IP - 2 DP - 2014 Mar-Apr TI - Phase I study of injectable, depot naltrexone for the relapse prevention treatment of opioid dependence. PG - 162-9 LID - 10.1111/j.1521-0391.2013.12085.x [doi] AB - BACKGROUND AND OBJECTIVES: We tested long-acting injectable depot naltrexone for its tolerability, pharmacokinetics, and safety in Phase I. METHODS: The Phase I trial enrolled 36 healthy participants in two panels (A, B). In Panel A, 24 subjects were randomly assigned to the high-dosage group (400 mg naltrexone, n=6; placebo, n=6) or low-dosage group (200 mg naltrexone, n=6; placebo, n=6). In Panel B, 12 subjects were randomized to take six doses of monthly injectable naltrexone (400 mg) or placebo. RESULTS: After a single injection of naltrexone 200 and 400 mg, means (SD) of naltrexone plasma concentrations were .57 (.28) ng/ml and 1.5 (.8) ng/ml 30 days post-injection. There was no effect of accumulation after multiple dosing. Eleven of 30 subjects (36.67%) who were administered injectable depot naltrexone reported a total of 12 adverse events (AEs). Seven of these 11 AEs were coded as possibly related with study medication. All treatment-related AEs were mild in severity. No serious treatment-related AEs occurred. DISCUSSION AND CONCLUSIONS: This long-acting formulation of injectable depot naltrexone is well tolerated, results in constant plasma concentration of naltrexone for at least 1 month. SCIENTIFIC SIGNIFICANCE: The tolerability and safety of long-acting injectable depot naltrexone are good. CI - Copyright (c) American Academy of Addiction Psychiatry. FAU - Xuyi, Wang AU - Xuyi W AD - Mental Health Institute of the Second Xiangya Hospital, Central South University, Changsha, Hunan, China. FAU - Juelu, Wang AU - Juelu W FAU - Xiaojun, Xiang AU - Xiaojun X FAU - Haiyan, Li AU - Haiyan L FAU - Zheyuan, Liu AU - Zheyuan L FAU - Zhehui, Gong AU - Zhehui G FAU - Guoming, Dong AU - Guoming D FAU - Gang, Liu AU - Gang L FAU - Jin, Li AU - Jin L FAU - Wei, Hao AU - Wei H LA - eng PT - Clinical Trial, Phase I PT - Journal Article PT - Randomized Controlled Trial PT - Research Support, Non-U.S. Gov't DEP - 20130920 PL - England TA - Am J Addict JT - The American journal on addictions JID - 9208821 RN - 0 (Delayed-Action Preparations) RN - 0 (Narcotic Antagonists) RN - 5S6W795CQM (Naltrexone) SB - IM MH - Adult MH - Delayed-Action Preparations/administration & dosage/adverse effects MH - Double-Blind Method MH - Female MH - Humans MH - Injections MH - Male MH - Naltrexone/*administration & dosage/adverse effects/blood/*pharmacokinetics MH - Narcotic Antagonists/administration & dosage/adverse effects/blood MH - Opioid-Related Disorders/*prevention & control MH - *Secondary Prevention MH - Young Adult EDAT- 2013/10/11 06:00 MHDA- 2015/10/23 06:00 CRDT- 2013/10/11 06:00 PHST- 2012/10/26 00:00 [received] PHST- 2013/03/27 00:00 [revised] PHST- 2013/03/31 00:00 [accepted] PHST- 2013/10/11 06:00 [entrez] PHST- 2013/10/11 06:00 [pubmed] PHST- 2015/10/23 06:00 [medline] AID - 10.1111/j.1521-0391.2013.12085.x [doi] PST - ppublish SO - Am J Addict. 2014 Mar-Apr;23(2):162-9. doi: 10.1111/j.1521-0391.2013.12085.x. Epub 2013 Sep 20.