Try our beta test site
IMPORTANT: Listing of a study on this site does not reflect endorsement by the National Institutes of Health. Talk with a trusted healthcare professional before volunteering for a study. Read more...

Naltrexone Implants as an Aid in Preventing Relapse Following Inpatient Treatment for Opioid Addiction

This study has been completed.
Information provided by:
University of Oslo Identifier:
First received: August 24, 2007
Last updated: May 4, 2009
Last verified: May 2009

The purpose of this clinical trial is to study the efficacy and safety of naltrexone implants as relapse prevention for patients that are completing treatment for opiate addiction in inpatient (or similarly controlled) settings. Participants volunteer for the study before being released from inpatient treatment, and are randomized to a naltrexone implant group or a waiting-list control for the duration of the first six months following completion of inpatient treatment. Both groups are free to receive treatment as usual (TAU) from the Norwegian healthcare system. After six months, both groups will be offered to have naltrexone implanted for the remaining six months of the study.

The hypotheses are that quality of life, depression, opioid use, will be significantly better in the naltrexone group compared to the non at 6-month follow-up. For the last six months of the trial, the investigators hypothesise that choice of naltrexone implant will mainly strengthen positive tendencies or reverse negative trends on the aforementioned variables.

The investigators also hypothesize that the implants can prevent death from opioid overdose up to 6 months after commenced treatment.

Condition Intervention Phase
Opiate Dependence
Drug: Go Medical Naltrexone implants
Phase 2
Phase 3

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Open Label
Primary Purpose: Treatment
Official Title: Naltrexone Naltrexone Implants as an Aid in Preventing Relapse Following Inpatient Treatment for Opioid Addiction - a Randomised Study

Resource links provided by NLM:

Further study details as provided by University of Oslo:

Primary Outcome Measures:
  • Drug use at 6 (12) months by self report and hair analysis [ Time Frame: 6 and 12 months ]
  • Days in work or education [ Time Frame: 6 and 12 months ]
  • Number of drug-free friends at 6 (12) months by self report [ Time Frame: 6 and 12 months ]

Secondary Outcome Measures:
  • Depression at 6 (12) months by BDI and Hopkins SCL-25 [ Time Frame: 6 and 12 months ]
  • Quality of life at 6 (12) months by EuropASI [ Time Frame: 6 and 12 months ]

Enrollment: 56
Study Start Date: January 2006
Study Completion Date: December 2008
Primary Completion Date: June 2008 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: intervention
Experimental group randomised after abstinence oriented treatment
Drug: Go Medical Naltrexone implants
Naltrexone implants 3.2 g (double of 1,6 g)
Other Name: Go Medical naltrexone implant
No Intervention: 2
waiting list control


Ages Eligible for Study:   19 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • soon to complete inpatient treatment for opioid addiction
  • living in southern Norway

Exclusion Criteria:

  • psychosis/major depression, currently not treated
  • pregnancy
  • liver enzymes: ASAT or ALAT > threefold above upper boundary
  • maintenance treatment with methadone or buprenorphine
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00521157

Unit for Addiction Medicine, University of Oslo
Oslo, Norway, N-0407
Sponsors and Collaborators
University of Oslo
Study Director: Helge Waal, Professor Unit for addiction medicine, Institute of psychiatry, University of Oslo
Study Director: Helge Waal, MD Norwegian Medical Association
  More Information

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Helge Waal, MD, Professor, Head of Center for Addiction Research, University of Oslo, Institute of Psychiatry, University of Oslo Identifier: NCT00521157     History of Changes
Other Study ID Numbers: 11899 revised
Study First Received: August 24, 2007
Last Updated: May 4, 2009

Keywords provided by University of Oslo:
Substance abuse
Opiate dependency
Relapse prevention

Additional relevant MeSH terms:
Opioid-Related Disorders
Disease Attributes
Pathologic Processes
Substance-Related Disorders
Chemically-Induced Disorders
Mental Disorders
Narcotic Antagonists
Physiological Effects of Drugs
Sensory System Agents
Peripheral Nervous System Agents processed this record on April 21, 2017