title: Randomized trial of long-acting sustained-release naltrexone implant vs oral naltrexone or placebo for preventing relapse to opioid dependence.
abstract: CONTEXT Sustained-release naltrexone implants may improve outcomes of nonagonist treatment of opioid addiction. OBJECTIVE To compare outcomes of naltrexone implants, oral naltrexone hydrochloride, and nonmedication treatment. DESIGN Six-month double-blind, double-dummy, randomized trial. SETTING Addiction treatment programs in St Petersburg, Russia. PARTICIPANTS Three hundred six opioid-addicted patients recently undergoing detoxification. INTERVENTIONS Biweekly counseling and 1 of the following 3 treatments for 24 weeks: (1) 1000-mg naltrexone implant and oral placebo (NI+OP group; 102 patients); (2) placebo implant and 50-mg oral naltrexone hydrochloride (PI+ON group; 102 patients); or (3) placebo implant and oral placebo (PI+OP group; 102 patients). MAIN OUTCOME MEASURE Percentage of patients retained in treatment without relapse. RESULTS By month 6, 54 of 102 patients in the NI+OP group (52.9%) remained in treatment without relapse compared with 16 of 102 patients in the PI+ON group (15.7%) (survival analysis, log-rank test, P < .001) and 11 of 102 patients in the PI+OP group (10.8%) (P < .001). The PI+ON vs PI+OP comparison showed a nonsignificant trend favoring the PI+ON group (P = .07). Counting missing test results as positive, the proportion of urine screening tests yielding negative results for opiates was 63.6% (95% CI, 60%-66%) for the NI+OP group; 42.7% (40%-45%) for the PI+ON group; and 34.1% (32%-37%) for the PI+OP group (P < .001, Fisher exact test, compared with the NI+OP group). Twelve wound infections occurred among 244 implantations (4.9%) in the NI+OP group, 2 among 181 (1.1%) in the PI+ON group, and 1 among 148 (0.7%) in the PI+OP group (P = .02). All events were in the first 2 weeks after implantation and resolved with antibiotic therapy. Four local-site reactions (redness and swelling) occurred in the second month after implantation in the NI+OP group (P = .12), and all resolved with antiallergy medication treatment. Other nonlocal-site adverse effects were reported in 8 of 886 visits (0.9%) in the NI+OP group, 4 of 522 visits (0.8%) in the PI+ON group, and 3 of 394 visits (0.8%) in the PI+ON group; all resolved and none were serious. No evidence of increased deaths from overdose after naltrexone treatment ended was found. CONCLUSIONS The implant is more effective than oral naltrexone or placebo. More patients in the NI+OP than in the other groups develop wound infections or local irritation, but none are serious and all resolve with treatment. TRIAL REGISTRATION clinicaltrials.gov Identifier: NCT00678418.
authors.affiliation: Department of Pharmacology, St Petersburg Pavlov State Medical University, St Petersburg, Russia.
authors.forename: Evgeny
authors.initials: E
authors.lastname: Krupitsky
authors.forename: Edwin
authors.initials: E
authors.lastname: Zvartau
authors.forename: Elena
authors.initials: E
authors.lastname: Blokhina
authors.forename: Elena
authors.initials: E
authors.lastname: Verbitskaya
authors.forename: Valentina
authors.initials: V
authors.lastname: Wahlgren
authors.forename: Marina
authors.initials: M
authors.lastname: Tsoy-Podosenin
authors.forename: Natalia
authors.initials: N
authors.lastname: Bushara
authors.forename: Andrey
authors.initials: A
authors.lastname: Burakov
authors.forename: Dmitry
authors.initials: D
authors.lastname: Masalov
authors.forename: Tatyana
authors.initials: T
authors.lastname: Romanova
authors.forename: Arina
authors.initials: A
authors.lastname: Tyurina
authors.forename: Vladimir
authors.initials: V
authors.lastname: Palatkin
authors.forename: Tatyana
authors.initials: T
authors.lastname: Slavina
authors.forename: Anna
authors.initials: A
authors.lastname: Pecoraro
authors.forename: George E
authors.initials: GE
authors.lastname: Woody
mesh_terms: D000284:Administration, Oral; D000293:Adolescent; D000328:Adult; D003131:Combined Modality Therapy; D003376:Counseling; D003692:Delayed-Action Preparations; D004305:Dose-Response Relationship, Drug; D004311:Double-Blind Method; D004334:Drug Administration Schedule; D004343:Drug Implants; D006556:Heroin Dependence / Q000534:rehabilitation*; D006801:Humans; D009271:Naltrexone / Q000008:administration & dosage* / Q000009:adverse effects; D009292:Narcotic Antagonists / Q000008:administration & dosage* / Q000009:adverse effects; D012426:Russia; D055502:Secondary Prevention; D015813:Substance Abuse Detection; D055815:Young Adult
chemical_list: D003692:Delayed-Action Preparations; D004343:Drug Implants; D009292:Narcotic Antagonists; D009271:Naltrexone