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Pharmacokinetic (PK) Evaluation of Nalmefene Formulations

A Phase 1, Open Label, Randomized, Single Dose, Three-Period Crossover Study in Healthy Subjects to Compare the Pharmacokinetic Profiles of Nalmefene Following Administration of Intravenous and Intramuscular Nalmefene 0.5 mg (0.94% MgCl2) and Intravenous Nalmefene Hydrochloride Injection 0.5 mg

Status
Completed
Phases
Phase 1
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT07543276
Enrollment
13
Registered
2026-04-21
Start date
2026-02-06
Completion date
2026-04-03
Last updated
2026-06-05

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Opioid Overdose

Brief summary

This study is designed to characterize the PK of nalmefene following IV bolus and IM injections using nalmefene 0.5 mg (0.94% MgCl2) and IV bolus of 0.5 mg nalmefene hydrochloride injection in healthy subjects.

Interventions

DRUGNalmefene + 0.94% MgCl2

Nalmefene 0.5 mg + 0.94% MgCl2 for IV (bolus) administration

Nalmefene Hydrochloride Injection 0.5 mg for IV (bolus) administration

Sponsors

Knoa Pharma LLC
Lead SponsorINDUSTRY
Purdue Pharma LP
CollaboratorINDUSTRY

Study design

Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
TREATMENT
Masking
NONE

Eligibility

Sex/Gender
ALL
Age
18 Years to 55 Years
Healthy volunteers
Yes

Inclusion criteria

Key Inclusion criteria: 1. Participants who are overtly healthy as determined by medical evaluation including medical history, physical examination, laboratory tests, and cardiac monitoring. 2. Body weight ranging from 50 to 100 kg (110-220 lbs) inclusive at screening and body mass index (BMI) within the range \[18.0-30.0\] kg/m2 (inclusive). 3. Willing to be compliant with the protocol, are able to read, understand, and answer verbal questions. Key

Exclusion criteria

1. Females who are pregnant or lactating. 2. Current or recent (within 5 years) history of drug or alcohol abuse. 3. History or any current conditions that might interfere with drug absorption, distribution, metabolism or excretion. 4. Known allergy or hypersensitivity to nalmefene hydrochloride or any of the excipients or other drug product components of nalmefene hydrochloride. 5. Dosing in a clinical drug study during the 30 days preceding the initial dose in this study. 6. Any significant illness during the 30 days preceding the initial dose in this study Other inclusion/

Design outcomes

Primary

MeasureTime frameDescription
Area Under the Curve (AUC0-2.5)2.5 minutes post-dosePartial area under the plasma concentration-time curve from time zero to 2.5 minutes following nalmefene 0.5 mg (0.94% MgCl2) IV bolus administration and nalmefene hydrochloride injection 0.5 mg IV bolus administration
Area Under the Curve (AUC0-5)5 minutes post-dosePartial area under the plasma concentration-time curve from time zero to 5 minutes following nalmefene 0.5 mg (0.94% MgCl2) IV bolus administration and nalmefene hydrochloride injection 0.5 mg IV bolus administration
Area Under the Curve (AUC0-10)10 minutes post-dosePartial area under the plasma concentration-time curve from time zero to 10 minutes following nalmefene 0.5 mg (0.94% MgCl2) IV bolus administration and nalmefene hydrochloride injection 0.5 mg IV bolus administration
Area Under the Curve (AUC0-15)15 minutes post-dosePartial area under the plasma concentration-time curve from time zero to 15 minutes following nalmefene 0.5 mg (0.94% MgCl2) IV bolus administration and nalmefene hydrochloride injection 0.5 mg IV bolus administration
Area Under the Curve (AUC0-20)20 minutes post-dosePartial area under the plasma concentration-time curve from time zero to 20 minutes following nalmefene 0.5 mg (0.94% MgCl2) IV bolus administration and nalmefene hydrochloride injection 0.5 mg IV bolus administration
Area Under the Curve (AUC0-30)30 minutes post-dosePartial area under the plasma concentration-time curve from time zero to 30 minutes following nalmefene 0.5 mg (0.94% MgCl2) IV bolus administration and nalmefene hydrochloride injection 0.5 mg IV bolus administration
Area Under the Curve (AUCt)Up to 48 hours post-doseArea under the plasma concentration-time curve from time zero to the time of last measurable concentration following nalmefene 0.5 mg (0.94% MgCl2) IV bolus administration and nalmefene hydrochloride injection 0.5 mg IV bolus administration
Area Under the Curve (AUCinf)Up to 48 hours post-doseArea under the plasma concentration-time curve from time zero to infinity following nalmefene 0.5 mg (0.94% MgCl2) IV bolus administration and nalmefene hydrochloride injection 0.5 mg IV bolus administration
Maximum Plasma Concentration (Cmax)Up to 48 hours post-doseMaximum plasma concentration of nalmefene following nalmefene 0.5 mg (0.94% MgCl2) IV bolus administration and nalmefene hydrochloride injection 0.5 mg IV bolus administration

Countries

United States

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Jun 6, 2026