New implant could help fight opioid addiction – safety trial begins
NCT ID NCT07325279
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This early-stage study tests the safety of nalmefene implants in 24 healthy adults. Participants receive one or two implants that stay in place for 4 or 12 weeks. Researchers monitor side effects and how the drug moves through the body to plan future studies in people with opioid addiction.
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Study facts
What this study's own registry entry says, in plain language.
- Phase
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Phase 1
The first testing in people. Mainly checks safety and dose, usually in a small group.
- Participants
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About 24 people
The number the study aims to enrol. It can still change while the study runs.
- Started
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Feb 2026
- Expected to finish
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Dec 2026
An estimate. End dates often move.
- Lead sponsor
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A company
The lead sponsor is a pharmaceutical, biotech, or medical-device company.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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18 years and older
- Sex
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Anyone
- Healthy volunteers
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Accepted
You do not need to have the condition being studied to take part.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: \- Subjects must meet all of the following criteria to be included in the study: 1. Male or female, non-smoker, ≥18 and ≤55 years of age, with body mass index (BMI) \>18.5 and \<35.0 kg/m2 and body weight ≥50.0 kg for males and ≥45.0 kg for females. 2. Healthy as defined by: 1. the absence of clinically significant illness and surgery within 4 weeks prior to implant insertion. 2. the absence of clinically significant history of dermatologic, neurological, musculoskeletal, endocrine, cardiovascular, respiratory, hematological, immunological, psychiatric, gastrointestinal, renal, hepatic, and metabolic disease. 3. Female subjects of non-childbearing potential must be: 1. post-menopausal with confirmation by documented follicle-stimulating hormone (FSH) test; or 2. surgically sterile . 4. Female subjects of childbearing potential who are sexually active with a non-sterile male partner must be willing to use an acceptable contraceptive methods throughout the study and for 30 days after the implant is removed: 5. Male subjects who are not vasectomized for at least 3 months prior to implant insertion and who are sexually active with a female partner of childbearing potential must be willing to use an acceptable contraceptive methods from implant insertion and for 30 days after the implant is removed: 6 Able to understand the study procedures and provide signed informed consent to participate in the study. Exclusion Criteria: * Subjects to whom any of the following applies will be excluded from the study: 1. Any clinically significant abnormal finding at physical examination at screening. 2. Clinically significant history of or current evidence of suicidal ideation or active suicidal behavior as based on the C-SSRS. 3. Clinically significant history or current evidence of depression as based on the MADRS. 4. Clinically significant abnormal laboratory test results or positive serology test results for hepatitis B surface antigen (HBsAg), hepatitis C virus (HCV) antibody, or human immunodeficiency virus (HIV) antigen and antibody at screening. 5. Positive pregnancy test or lactating female subject. 6. Positive urine drug screen, urine cotinine test, or alcohol breath test. 7. Known medically significant intolerance or allergic reactions to nalmefene or to ethylene vinyl acetate 8. Hypersensitivity to lidocaine or other local anesthetics of the amide type, epinephrine, antiseptic solution 9. Clinically significant ECG abnormalities or vital signs abnormalities 10. History of drug use within 1 year prior to screening or recreational use of marijuana within 1 month 11. History of alcohol abuse within 1 year prior to screening 12. Use of medications for the timeframes specified below: 1. depot injection or implant within 3 months prior to implant insertion; 2. any drug known to induce hepatic drug metabolism within 30 days prior to implant insertion; 3. prescription medications within 14 days prior to implant insertion; 4. any vaccine within 14 days prior to implant insertion; 5. over-the-counter medications and natural health products within 7 days prior to implant insertion 13. Participation in a clinical research study involving the administration of an investigational or marketed drug or device within 30 days prior to implant insertion, 14. Donation of plasma within 7 days prior to dosing or donation or 15. Intolerant to venipuncture and/or have difficulty with venous access. 16. History of wound healing problems. 17. Lymphedema, scarring, or tattoos on his/her inner upper arms within 2 months prior to screening or a history of keloid scarring. 18. Any dermatologic disorder, including cancer, that precludes the safety of the implant 19. Any reason which, in the opinion of the Investigator, would prevent the subject from participating in the study.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
How to take part
Only the study team decides who joins. These are the ways to reach them.
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The places running it
1 site. The list below names each one and where it is.
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The official record
ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.
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A doctor treating you
A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.
Contacts and locations
Locations
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Premier Research
RECRUITINGMorrisville, North Carolina, 27560, United States
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