This page shows what was measured, who it was measured in, and what that does not settle.
What Nalmefene does in the body
The emergency treatment of known or suspected overdose induced by natural or synthetic opioids
From the FDA-approved label: OPVEE is an antagonist at opioid receptors.
What happened in people
RNAWiki has not yet published a reviewed conclusion for this use.
§ A fixed RNAWiki sentence
Where this came from
Wording RNAWiki always uses, not a finding about this substance.
No reviewed claim names a result for any goal on this record.
No source is stored against this line.
The limit that matters most
Not recorded.
Where it acts
Not recorded.
Kind of result
No result is published, so no kind of result applies yet
Supervision
RNAWiki has not recorded a supervision or regulatory status for this substance.
What the registries record it as
The substance registry classes this as chemical.
FDA substance registry · TOV02TDP9I · read 2026-08-29
Where each sentence above came from
No recorded sentence describes the change this makes in a way that stands on its own. The page opens with what it is taken for instead, and the recorded explanation follows below.
Shown as the opening line on this page.
No statement of the main limit is recorded.
The four opening statements run to 38 words.
Words this page uses
Four words worth knowing first
Chosen from what this page shows, with each one explained before the word it depends on.
Biomarker
A biomarker is a number from a test that stands in for something about health.
A picture of it, and where the picture fails
A biomarker is like a fuel gauge.
Where that stops being true. A gauge is wired to the tank. Many biomarkers are only loosely tied to health.
What people get wrong. A better number is read as a better life. Several medicines improved a number and helped nobody.
A measurable indicator used as a substitute for a clinical outcome of interest.
Placebo
A placebo is a dummy treatment given so the real one can be compared with it.
A picture of it, and where the picture fails
A placebo is like a blank control in an experiment.
Where that stops being true. A blank does nothing. People given a placebo often do get better.
What people get wrong. A placebo effect is read as imaginary. The improvement is measured and real.
An inactive intervention matched in appearance to the test intervention, used to control for non-specific effects.
Comparator
A comparator is whatever the treatment was measured against.
A picture of it, and where the picture fails
It is like the other runner in a race.
Where that stops being true. A race has one winner. A study can show both arms improved.
What people get wrong. Results are read without asking what the other group got. Beating nothing is not beating a treatment.
The control condition against which the experimental intervention is assessed.
What happened in people◇Read from sources, not yet reviewed
What happened in people
Each card is one study: the exact question it asked, who was in it, and whether it showed what it set out to show.
Change From Baseline in the Monthly Number of Heavy Drinking Days (HDDs)
✗ The study did not show it
Who was studied
NCT00812461
How many people
678
Study design
Phase 3
Compared against
Not recorded for this study
Kind of result
A number that stands in for health
What was found
Result not recorded on this page
Repeated elsewhere
Unreplicated
What this does not prove. A study that did not show an effect does not show that no effect exists anywhere.
The limits of this study, and where it came from
Main limit. No limitation is recorded for this study.
How far it carries. This study is recorded from the curated record, not from the registry match.
Form and route. Intramuscular, intravenous, subcutaneous
Interval reported. Not recorded in this summary
Written into the record, not signed off as a reviewed claim.
openFDA Drugs@FDA · a recorded source, not a stored snapshot
openFDA NDC Directory · a recorded source, not a stored snapshot
openFDA SPL label · a recorded source, not a stored snapshot
PubChem PUG-REST · a recorded source, not a stored snapshot
Change in the Number of Heavy Drinking Days (HDDs) From Baseline at Week 12
✗ The study did not show it
Who was studied
NCT02364947
How many people
678
Study design
Phase 3
Compared against
Not recorded for this study
Kind of result
A number that stands in for health
What was found
Result not recorded on this page
Repeated elsewhere
Unreplicated
What this does not prove. A study that did not show an effect does not show that no effect exists anywhere.
The limits of this study, and where it came from
Main limit. No limitation is recorded for this study.
How far it carries. This study is recorded from the curated record, not from the registry match.
Form and route. Intramuscular, intravenous, subcutaneous
Interval reported. Not recorded in this summary
Written into the record, not signed off as a reviewed claim.
openFDA Drugs@FDA · a recorded source, not a stored snapshot
openFDA NDC Directory · a recorded source, not a stored snapshot
openFDA SPL label · a recorded source, not a stored snapshot
PubChem PUG-REST · a recorded source, not a stored snapshot
Number of Patients With Adverse Events (AEs)
✗ The study did not show it
Who was studied
NCT00811941
How many people
665
Study design
Phase 3
Compared against
Not recorded for this study
Kind of result
A number that stands in for health
What was found
Result not recorded on this page
Repeated elsewhere
Unreplicated
What this does not prove. A study that did not show an effect does not show that no effect exists anywhere.
The limits of this study, and where it came from
Main limit. No limitation is recorded for this study.
How far it carries. This study is recorded from the curated record, not from the registry match.
Form and route. Intramuscular, intravenous, subcutaneous
Interval reported. Not recorded in this summary
Written into the record, not signed off as a reviewed claim.
openFDA Drugs@FDA · a recorded source, not a stored snapshot
openFDA NDC Directory · a recorded source, not a stored snapshot
openFDA SPL label · a recorded source, not a stored snapshot
PubChem PUG-REST · a recorded source, not a stored snapshot
Change From Baseline in the Monthly Number of Heavy Drinking Days (HDDs)
✗ The study did not show it
Who was studied
NCT00811720
How many people
598
Study design
Phase 3
Compared against
Not recorded for this study
Kind of result
A number that stands in for health
What was found
Result not recorded on this page
Repeated elsewhere
Unreplicated
What this does not prove. A study that did not show an effect does not show that no effect exists anywhere.
The limits of this study, and where it came from
Main limit. No limitation is recorded for this study.
How far it carries. This study is recorded from the curated record, not from the registry match.
Form and route. Intramuscular, intravenous, subcutaneous
Interval reported. Not recorded in this summary
Written into the record, not signed off as a reviewed claim.
openFDA Drugs@FDA · a recorded source, not a stored snapshot
openFDA NDC Directory · a recorded source, not a stored snapshot
openFDA SPL label · a recorded source, not a stored snapshot
PubChem PUG-REST · a recorded source, not a stored snapshot
Time stay in PACU
✗ The study did not show it
Who was studied
NCT04713358
How many people
542
Study design
Phase 4
Compared against
Not recorded for this study
Kind of result
A number that stands in for health
What was found
Result not recorded on this page
Repeated elsewhere
Unreplicated
What this does not prove. A study that did not show an effect does not show that no effect exists anywhere.
The limits of this study, and where it came from
Main limit. No limitation is recorded for this study.
How far it carries. This study is recorded from the curated record, not from the registry match.
Form and route. Intramuscular, intravenous, subcutaneous
Interval reported. Not recorded in this summary
Written into the record, not signed off as a reviewed claim.
openFDA Drugs@FDA · a recorded source, not a stored snapshot
openFDA NDC Directory · a recorded source, not a stored snapshot
openFDA SPL label · a recorded source, not a stored snapshot
PubChem PUG-REST · a recorded source, not a stored snapshot
Number of Participants With Adverse Events
✗ The study did not show it
Who was studied
NCT02382276
How many people
405
Study design
Phase 3
Compared against
Not recorded for this study
Kind of result
A number that stands in for health
What was found
Result not recorded on this page
Repeated elsewhere
Unreplicated
What this does not prove. A study that did not show an effect does not show that no effect exists anywhere.
The limits of this study, and where it came from
Main limit. No limitation is recorded for this study.
How far it carries. This study is recorded from the curated record, not from the registry match.
Form and route. Intramuscular, intravenous, subcutaneous
Interval reported. Not recorded in this summary
Written into the record, not signed off as a reviewed claim.
openFDA Drugs@FDA · a recorded source, not a stored snapshot
openFDA NDC Directory · a recorded source, not a stored snapshot
openFDA SPL label · a recorded source, not a stored snapshot
PubChem PUG-REST · a recorded source, not a stored snapshot
What we know
RNAWiki holds 6 written-up human studies for this substance, each with the question it asked.
How we know it
Each card names the study, the number of people and what the study set out to measure.
What this does not prove
These summaries were written by a person and have not been signed off as reviewed claims.
Why it matters
A study that failed is as informative as one that worked, and both are here.
What we still do not know
No reviewed claim exists, so no exact population, effect size or interval is published yet.
What is missing or unclear◇Read from sources, not yet reviewed
Were people like you studied?
RNAWiki cannot tell whether a study fits you. It can show who was in it, and where the result stops carrying.
Who was studied
People similar to this profile were included.
OPVEE nasal spray is indicated for the emergency treatment of known or suspected overdose induced by natural or synthetic opioids in adults and pediatric patients aged 12 years and older, as manifested by respiratory and/or central nervous system depression. OPVEE nasal spray is intended for immediate administration as emergency therapy in settings where opioids may be present.
Who is missing from the studies
Which groups were under-represented in the studies has not been recorded for this substance. Pregnancy, breastfeeding, children, older adults, and people with liver or kidney conditions are commonly excluded from trials; nothing here says whether they were.
What the label states about particular groups
On pediatric, the label states: “The safety and effectiveness of ZURNAI for the emergency treatment of known or suspected opioid overdose, as manifested by respiratory and/or central nervous system depression, have been established in pediatric patients aged 12 years and older.”
US prescribing information · a59a5847-9fe4-4341-a203-be0a5e6d3e36 · read 2026-08-30
On older people, the label states: “Clinical studies of nalmefene hydrochloride injection did not include sufficient number of subjects aged 65 and over to determine whether they respond differently from younger subjects.”
US prescribing information · a59a5847-9fe4-4341-a203-be0a5e6d3e36 · read 2026-08-30
On people who are pregnant, the label states: “Risk Summary Life-sustaining therapy for opioid overdose should not be withheld [see Clinical Considerations ] .”
US prescribing information · a59a5847-9fe4-4341-a203-be0a5e6d3e36 · read 2026-08-30
On people who are breastfeeding, the label states: “Risk Summary There are no data on the presence of nalmefene and its metabolites in human milk, the effects of nalmefene on the breastfed child, or the effects on milk production.”
US prescribing information · a59a5847-9fe4-4341-a203-be0a5e6d3e36 · read 2026-08-30
On people with reduced liver function, the label states: “substantially reduces the clearance of nalmefene [see Clinical Pharmacology (12.3) ] .”
US prescribing information · a59a5847-9fe4-4341-a203-be0a5e6d3e36 · read 2026-08-30
Where the result stopped carrying
This is a scope explorer, not a diagnosis engine.
It shows who was studied so you can see whether people similar to you were included.
RNAWiki cannot tell whether a study fits you. It can show who was in it.
What it would be like to take◇Read from sources, not yet reviewed
Why it might seem to do nothing
A real effect and a noticed effect are different things. These are the recorded reasons the two come apart.
It was studied in different people
The people in the studies were not much like the reader.
On this record: Which groups were under-represented in the studies has not been recorded for this substance. Pregnancy, breastfeeding, children, older adults, and people with liver or kidney conditions are commonly excluded from trials; nothing here says whether they were.
The evidence may simply be wrong
Small early studies often do not hold up.
On this record: RNAWiki has not yet published a reviewed conclusion for this use.
Other reasons RNAWiki checked and found nothing for (11)
It was studied for a different goal
The studies measured something else entirely. Nothing in this record points to this reason.
A different form was studied
The studied form is not the form on the shelf. Nothing in this record points to this reason.
There was nothing to correct
Where a level is already normal, topping it up may change nothing. Nothing in this record points to this reason.
Something else had to happen too
In the studies it was paired with training, a diet or another treatment. Nothing in this record points to this reason.
The change is too small to feel
A real change can still sit below what a person notices. Nothing in this record points to this reason.
Day-to-day swing hides it
Sleep, food, stress and time of day move most numbers more than this would. Nothing in this record points to this reason.
Not enough time yet
The studies ran longer than the person has waited. Nothing in this record points to this reason.
It was not taken as studied
Missed days change the result, and studies count them. Nothing in this record points to this reason.
Something else changed at the same time
Two changes at once cannot be told apart afterwards. Nothing in this record points to this reason.
The product may not be what it says
Contents of a sold product are not always what the label states. Nothing in this record points to this reason.
No recorded reason
RNAWiki has nothing stored that would explain it. Nothing in this record points to this reason.
None of these is a reason to take more. Taking more is not a step this page ever suggests.
What it would be like to take◇Read from sources, not yet reviewed
What taking it involves
The recorded facts about getting hold of it and using it. Nothing here is a suggestion about what you should do.
How it is supplied
Given by a clinician
❝ Quoted from a source
Where this came from
Copied from a source RNAWiki stored, with the source named.
Read from the recorded approval status.
No source is stored against this line.
Form and route
Intramuscular, intravenous, subcutaneous
✎ Source-linked record
Where this came from
A person wrote this into the record with the study named beside it. No reviewer has signed it off.
The form and route recorded on this substance.
No source is stored against this line.
Who oversees it
RNAWiki has not recorded a supervision or regulatory status for this substance.
❝ Quoted from a source
Where this came from
Copied from a source RNAWiki stored, with the source named.
No register row and no identity class settled the question.
No source is stored against this line.
What is in the pack
Sold as solution, spray, injection, solution, given by the intramuscular, intravenous, subcutaneous, nasal, intramuscular, subcutaneous route.
✎ Source-linked record
Where this came from
A person wrote this into the record with the study named beside it. No reviewer has signed it off.
Recorded notes on how this is sold and what that means for what is in the pack.
No source is stored against this line.
Where it is registered
Regulatory records are listed in the technical disclosure at the foot of this page.
# Counted from records
Where this came from
A count of rows RNAWiki holds. It describes our records, not your body.
Register entries are stored per jurisdiction and shown with their dates.
No source is stored against this line.
Why people stop
Not recorded.
∅ Nothing recorded
Where this came from
RNAWiki holds nothing here and says so rather than guessing.
No record of why people stopped taking it is stored for this substance.
No source is stored against this line.
What it would be like to take∅Nothing found in the sources checked
What can go wrong
Sorted by where each line came from. A regulator's label and a report somebody sent in are not the same kind of fact.
∅Nothing found in the sources checked
No harm is recorded against this substance in the sources RNAWiki checked. Finding nothing is not the same as showing there is nothing.
The sources listed were searched and held nothing. That is not the same as nothing existing.
Over a long time. No completed tested study window is recorded, so long-term effects are not established by the registry record.
Groups the studies covered thinly. Which groups were under-represented in the studies has not been recorded for this substance. Pregnancy, breastfeeding, children, older adults, and people with liver or kidney conditions are commonly excluded from trials; nothing here says whether they were.
What is missing or unclear◇Read from sources, not yet reviewed
Does the exact form matter?
Evidence belongs to the exact thing that was tested. A different salt, a different mixture or a different preparation is a different question.
The form that was studied
Intramuscular, intravenous, subcutaneous
✎ Source-linked record
Where this came from
A person wrote this into the record with the study named beside it. No reviewer has signed it off.
The form used in the studies cited on this page.
No source is stored against this line.
What is sold
Not recorded.
∅ Nothing recorded
Where this came from
RNAWiki holds nothing here and says so rather than guessing.
Nothing further is recorded about which forms are sold.
No source is stored against this line.
What is recorded as being sold
9 products list this as an active ingredient in the United States drug directory. 9 of them contain it and nothing else.
FDA National Drug Code directory · 0406-5690 · read 2026-08-29
They are sold as injection, solution, powder, solution and spray, taken intramuscular, intravenous, nasal and subcutaneous.
FDA National Drug Code directory · 0406-5690 · read 2026-08-29
The regulator's established pharmacologic class for it is opioid antagonist [epc] and opioid antagonists [moa].
FDA National Drug Code directory · 0406-5690 · read 2026-08-29
4 published labels name it as an active ingredient. 4 of them describe this substance alone, which is where its own label text on this page comes from.
US prescribing information · a59a5847-9fe4-4341-a203-be0a5e6d3e36 · read 2026-08-29
Those labels are classed as human prescription drug.
US prescribing information · a59a5847-9fe4-4341-a203-be0a5e6d3e36 · read 2026-08-29
Zurnai is intramuscular at 3 DOSAGE FORMS AND STRENGTHS Injection: 1.5 mg nalmefene base/0.5 mL in a prefilled, single-dose auto-injector ( 3 ) Injection: 1.5 mg/0.5 mL nalmefene (base), clear, colorless to light yellow solution in a pre-filled,…, recorded as fda label in effect 2026-07-31 in the United States.
US prescribing information · a59a5847-9fe4-4341-a203-be0a5e6d3e36 · read 2026-08-30
Evidence carries across two names for one substance. It does not carry across a salt, a mirror form or a mixture.
What it would be like to take◇Read from sources, not yet reviewed
What you could measure
This one is decided with a clinician, so this section holds questions to ask rather than a plan to run.
RNAWiki could not confidently classify this substance, so no self-experiment plan is offered.
Questions worth asking
Which of the trials of Nalmefene studied people like me?
What was measured, and for how long?
Was the result a laboratory value or a health outcome?
What would we watch for, and when would we stop?
Tracking can show whether something changed for you. It cannot show what caused it.
RNAWiki records evidence. It does not say whether this substance is right for you.
What is missing or unclear◇Read from sources, not yet reviewed
What nobody knows yet
Open questions, each with why it is open and what would close it.
Missing populations
Which groups were under-represented in the studies has not been recorded.
Why it matters. Recorded by the evidence model as a gap on this record.
What would answer it
A study that measures it, and a reviewer to sign it off.
Last checked 2026-09-04. Searched: The sources listed in the receipts at the foot of this page.
Missing long-term data
No completed tested study window is recorded.
Why it matters. Recorded by the evidence model as a gap on this record.
What would answer it
A study that measures it, and a reviewer to sign it off.
Last checked 2026-09-04. Searched: The sources listed in the receipts at the foot of this page.
No reviewed conclusion
RNAWiki has not yet published a reviewed conclusion for this use.
Why it matters. Recorded by the evidence model as a gap on this record.
What would answer it
A study that measures it, and a reviewer to sign it off.
Last checked 2026-09-04. Searched: The sources listed in the receipts at the foot of this page.
Missing interaction studies
No interaction was found in the registers checked. Not finding one is not the same as showing there is none.
Why it matters. Recorded by the evidence model as a gap on this record.
What would answer it
A study that measures it, and a reviewer to sign it off.
Last checked 2026-09-04. Searched: The sources listed in the receipts at the foot of this page.
Formulation uncertainty
Several salts, forms or products of Nalmefene are recorded. Results from one form may not transfer to another.
Why it matters. Recorded by the evidence model as a gap on this record.
What would answer it
A study that measures it, and a reviewer to sign it off.
Last checked 2026-09-04. Searched: The sources listed in the receipts at the foot of this page.
Mechanism not reviewed
No reviewed mechanism story exists for this substance.
Why it matters. Recorded by the evidence model as a gap on this record.
What would answer it
A study that measures it, and a reviewer to sign it off.
Last checked 2026-09-04. Searched: The sources listed in the receipts at the foot of this page.
What happened in people◇Read from sources, not yet reviewed
Check any of this yourself
Every line above traced back to the study it came from. This is the technical layer, and the vocabulary changes here.
How many documents were read
4 documents were read for this substance.
RNAWiki source record
2 of them state the same tMax, and they agree.
RNAWiki source record
3 of them state the same volumeOfDistribution, and they agree.
RNAWiki source record
Where else this substance is registered
FDA substance identifier (UNII)
TOV02TDP9I
CAS registry number
55096-26-9
PubChem compound
5284594
ChEMBL
CHEMBL982
WHO international nonproprietary name list entry
5189
RxNorm concept
31479
EMA substance identifier
100000084441
DrugBank
DB06230
Checks this page had to pass
✓ Passed
Identity resolved
no open identity hold
✓ Passed
No unresolved merge across substance families
no quarantine open
✓ Passed
Every public sentence names a source
The opening statement carries the origin: Written into the record, not signed off.
✗ Not passed
Trial roles classified for highlighted evidence
No registered study is classified as testing this substance.
✓ Passed
No internal keys in reader text
enforced by the copy-contract test over the rendered page
✗ Not passed
Safety mode resolved
No register row and no identity class settled the question.
✓ Passed
Canonical metadata present
slug and display name present
What is missing or unclear◇Read from sources, not yet reviewed
How this medicine reached us
Kept near the foot of the page. A historical event moves up only when it changes something about this substance today.
What the approval register records
5 approved applications cover products containing this substance. The earliest was NDA020459, approved 19950417 to HIKMA.
This order is fixed in code and does not count clicks or time on the page.
What is not here
9 questions this page could not answer
These sections were prepared and left out because there was nothing to put in them. They are listed rather than hidden, so the gaps in this record are visible.
What was measured, goal by goal — found nothing in the sources checked.
How close this is to real life — found nothing in the sources checked.
The path through the body — found nothing in the sources checked.
Felt, measured, or meaningful — found nothing in the sources checked.
How long anything takes — found nothing in the sources checked.
What it may clash with — found nothing in the sources checked.
Other ways to the same goal — found nothing in the sources checked.
Claims that go past the evidence — found nothing in the sources checked.
What changed on this page — found nothing in the sources checked.
The record as stored
The full record, for auditing
Everything above is built from what is below. This layer keeps the technical vocabulary, record identifiers and every stored row, so a reader who wants to check the page can.
Recorded evidence blocks (9)
Q1
On the Nalmefene label: indicated for what?
"Nalmefene hydrochloride injection is indicated for the complete or partial reversal of opioid drug effects, including respiratory depression, induced by either natural or synthetic opioids. Nalmefene hydrochloride injection is indicated in the management of known or suspected opioid overdose.": indications and usage on Nalmefene's label. DailyMed label · 3abfbffc-9e52-4fc6-ae92-6e0a97f4afe7 · 2026-05-01
Q2
37 registered trials of Nalmefene — at which phases?
Registered studies posting no result
25 of 37
37 registered studies of Nalmefene: 14 phase1, 9 phase3, 7 phase2, 4 phase4, 2 na, 2 na or unstated, 1 early phase1. CLINICALTRIALS_SNAPSHOT · 2026-09-01
93 with a PubMed record
Show the evidence
phase1
14
phase3
9
phase2
7
phase4
4
na
2
na or unstated
2
7 more recorded rows
early phase1
1
completed
27
terminated
3
withdrawn
3
unknown
2
not yet recruiting
1
recruiting
1
recorded 2026-09-01 · last checked 2026-09-04
Q3
6 of Nalmefene's trials stopped: accrual/recruitment, other?
"The study was terminated due to enrolment challenges"; 6 of 37 registered studies
Show the evidence
Trial
NCT02195817
terminated; "The study was terminated due to enrolment challenges"
NCT02372318
terminated; "Anticipated nr of 25 probands was not reached in terms of full data sets (missing data, low fMRI data quality), but time frame for recruitment ended."
NCT02824354
withdrawn; "no participants enrolled"
NCT05338632
terminated; "Recruitment of chronic opioid users was substantially lower than anticipated despite extensive recruitment efforts; the study was therefore closed before reaching the planned sample size."
NCT05808881
withdrawn; "Due to changes in research objectives and methodological approach."
NCT06408714
withdrawn; "No participants enrolled"
recorded 2026-09-01 · last checked 2026-09-04
Q4
Human studies of Nalmefene used Nalmefene 18 mg — over how long?
Human studies of Nalmefene used "Nalmefene 18 mg". ClinicalTrials.gov · 2026-09-01
7 recorded entries; human; tablet; also "Nalmefene 18 mg, then placebo", "Placebo, then Nalmefene 18 mg", "Selincro® 18 mg with continuous psychosocial support: Cohort A"
Show the evidence
human
NCT01934166
Nalmefene 18 mg
NCT01969617
Nalmefene 18 mg, then placebo
NCT01969617
Placebo, then Nalmefene 18 mg
NCT02195817
Selincro® 18 mg with continuous psychosocial support: Cohort A
NCT02679469
nalmefene hydrochloride 10 mg
NCT02824354
tablet; Nalmefene (Selincro®) 18 mg tablet
1 more recorded row
humanNCT07543276
Nalmefene + 0.94% MgCl2
recorded 2026-09-01 · last checked 2026-09-04
Q5
Nalmefene's half-life is 41 ± 34 minutes — which schedules were studied?
41 ± 34 minutes, the half-life Nalmefene's label states: "ELIMINATION After intravenous administration of 1 mg nalmefene hydrochloride injection to normal males (ages 19 to 32), plasma concentrations declined biexponentially with a redistribution and a terminal elimination half-life of 41 ± 34 minutes and 10.8 ± 5.2 hours, respectively." DailyMed label · 3abfbffc-9e52-4fc6-ae92-6e0a97f4afe7 · 2026-05-01
bioavailability 101.5 %.
Show the evidence
half lifepharmacokinetics
41 ± 34 minutes; ELIMINATION After intravenous administration of 1 mg nalmefene hydrochloride injection to normal males (ages 19 to 32), plasma concentrations declined biexponentially with a redistribution and a terminal elimination half-life of 41 ± 34 minutes and 10.8 ± 5.2 hours, respectively.
bioavailabilitypharmacokinetics
101.5 %; The relative bioavailabilities of intramuscular and subcutaneous routes of administration were 101.5% ± 8.1% (Mean ± SD) and 99.7% ± 6.9%, respectively.
metabolismpharmacokinetics
METABOLISM Nalmefene is metabolized by the liver, primarily by glucuronide conjugation, and excreted in the urine.
recorded 2026-05-01 · last checked 2026-09-04
Q6
Which 10 trials of Nalmefene posted no result?
Posted no result
10 of 10 completed trials
Registrations
NCT00202696, NCT00132119, NCT00838708, NCT03129347, NCT02492581 and NCT03034408, and 4 more
Completion dates
oldest 2006-03; newest 2024-02-06
Show the evidence
Trial
NCT00202696
2006-03
NCT00132119
2006-08
NCT00838708
2009-08
NCT03129347
2017-07-03
NCT02492581
2018-04
NCT03034408
2018-12-17
4 further recorded trials
NCT03279562
2019-12-30
NCT02639273
2023-12-08
NCT04713358
2023-12-31
NCT04107051
2024-02-06
Q7
At the median, Nalmefene's trials enrolled 40 people — anything larger?
Median enrolment
40
Largest enrolment
700
Registered trials counted
37
Q8
What do 1 spontaneous reports say about Nalmefene — and not say?
These are reports people sent to a regulator. They do not show the medicine caused the reaction. Nobody counted how many people took the medicine and reported nothing. The same event can be reported more than once, and many reports are incomplete. News coverage, lawsuits and new warnings change how often people report. A count is not a rate and not a risk.
Nalmefene appears in spontaneous reports to regulators. Across the 1 most-reported reaction term, 1 reaction mentions were counted: laryngotracheal oedema 1. FAERS via Open Targets · CHEMBL1201152 · 2026-06-24
ChEMBL 37 — CC BY-SA 3.0 Unported · ClinicalTrials.gov — US Government work · Open Targets 26.06 — CC0 · mixed register set; per-register licences in docs/specs/corpus-20k-sources.md · openFDA / DailyMed — US Government work
✗ required summary fields resolved: 4 required field(s) not terminal: Why people use it, Best-supported result, Biggest unanswered question, Human evidence
✓ public claims reviewed: 0 reviewed claim(s); drafts are never rendered
✓ source coverage passed: 7 source rows
✓ no critical contamination: no quarantine open
✓ canonical metadata passed: slug and display name present
✓ no raw internal fields: enforced by the copy-contract test over the rendered page
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