Pharmacokinetic Study of Vivitrol in Healthy Participants

Phase 1

Completed

Conditions: Opioid-use Disorder

Interventions: Drug: Naltrexone 380 MG

Registration Number: NCT04716881

Lead Sponsor: Go Medical Industries Pty Ltd

Brief Summary: This is a Phase I, single-center, single arm, open-label study, to establish the pharmacokinetic (PK) parameters of Vivitrol 380 mg IM injection (IP), a US Food and Drug Administration (FDA) approved medication.

Detailed Description: This is a Phase I, single-center, single arm, open-label study, to establish the PK parameters of Vivitrol 380 mg IM injection (IP), a US FDA approved medication. Participants will be healthy volunteers with no significant medical or mental health disorders, who have completed participation in clinical trial GM0017 (i.e. have received the OLANI treatment and have subsequently provided two consecutive plasma levels of naltrexone (NTX) \<0.1ng/mL).

This study will examine the PK profile of Vivitrol IM 380 mg over 6 doses for a treatment period of 196 days. Intense sampling will occur after the 1st and 6th dose of Vivitrol. Participants will be without a DSM 5 - Substance Related Disorders classification. Participants will be required to undergo a Naloxone Challenge Test (NCT) to confirm opiate naivety before administration of the IP. No randomization will occur.

Recruitment & Eligibility

Status: COMPLETED

Sex: All

Target Recruitment: 9

Inclusion Criteria

Have completed GM0017 (i.e. been administered OLANI (3.6 gram) and provided two consecutive monthly blood samples of NTX below 0.1 ng/mL)
Men or women between ≥18 and <58 years old Without DSM 5 - Substance Related Disorders classification; in sustained remission is not exclusionary
Able and willing to comply with the requirements of the protocol
Able and willing to provide written informed consent
Willing to undergo an injection of NTX to allow for investigational drug administration in the intramuscular tissue
Have an initial weight between 45.3 and 81.6 kilograms (inclusive) or have a BMI inclusive of 18.5 to 30.0.

Exclusion Criteria

Is currently on active NTX medication.
Positive UDS at screening for illicit substances.
Has a condition which requires treatment with opioid based medication.
Has a known hypersensitivity to NTX.
Is prone to skin rashes, irritation or has a skin condition such as recurrent eczema that is likely to impact the injection site area, or as determined by the evaluating physician.
Demonstrates any abnormal skin tissue in the proposed injection area.
Is pregnant or planning to be. Women need to have negative pregnancy test at screening. Women need to agree to practice an effective method of contraception throughout participation.
Participant is breastfeeding or planning to be.
Has a current significant neurological (including cognitive and psychiatric disorders),
Any clinically important abnormal finding as determined by medical history, physical examination, ECG or clinical laboratory tests.
Any additional condition(s) that in the investigator's opinion would prohibit the participant from completing the study or would not be in the best interest of the participant.
ALT or AST >3 times the upper end of the laboratory normal range.
Any methadone use 14 days prior to screening, and up to Study Day 0.
Current DSM 5 diagnosis of schizophrenia, bipolar, anxiety, or depressive disorder, confirmed by MINI assessment, or currently treated with medications for anxiety or depression. Past history (in remission DSM 5 classification) of anxiety or depression is not exclusionary.
Any elevated risk for suicide measured using the Columbia Suicide Severity Rating Scale, endorsing any of the items in the past month (C-SSRS, Lifetime)
Is participating or intending to participate in any other clinical trial during the duration of this study.
Is allergic to any of the ingredients in Vivitrol or the diluent used to mix Vivitrol (i.e. carboxymethylcellulose sodium, polysorbate 20, sodium chloride, sodium hydroxide and hydrochloric acid as pH adjusters, in water for injection).

Study & Design

Study Type: INTERVENTIONAL

Study Design: SINGLE_GROUP

Arm && Interventions

Group	Intervention	Description
Vivitrol (naltrexone)	Naltrexone 380 MG	Intramuscular injection of Vivitrol (naltrexone), 380 mg. Six doses given 28 days apart.

Primary Outcome Measures

Name	Time	Method
Median Cmax of Naltrexone (After 1st Dose)	1st dose: Day 0 (predose), 1, 2, 4, 8, 12 hours, 24 hours (Day 1), Days 1.5, 1.75, 2, 3, 5, 7, 10, 14, 17, 21, 24, and 28.	Single-dose PK measurement of the maximum observed plasma naltrexone concentration (Cmax) after dosing on Day 0
Median Ctrough of Naltrexone (After 1st Dose)	1st dose: Day 0 (predose), 1, 2, 4, 8, 12 hours, 24 hours (Day 1), Days 1.5, 1.75, 2, 3, 5, 7, 10, 14, 17, 21, 24, and 28.	Single-dose PK measurement of naltrexone concentration at the end of the dosing interval (Ctrough) after dosing on Day 0
Median Ctrough of Naltrexone (After 6th Dose)	6th dose: Day 140 (1, 2, 4, 8 & 12 hours), 141, 141.5, 141.75, 142, 143, 145, 147, 150, 154, 157, 161, 164, 168, 182 and 196	PK measurement of naltrexone concentration at the end of the dosing interval (Ctrough) after dosing on Day 140
Median Cmax of 6β-naltrexol (After First Dose)	1st dose: Day 0 (predose), 1, 2, 4, 8, 12 hours, 24 hours (Day 1), Days 1.5, 1.75, 2, 3, 5, 7, 10, 14, 17, 21, 24, and 28.	Single-dose PK measurement of the maximum observed plasma 6β-naltrexol concentration (Cmax) after dosing on Day 0
Median Tmax of Naltrexone (After 6th Dose)	6th dose: Day 140 (1, 2, 4, 8 & 12 hours), 141, 141.5, 141.75, 142, 143, 145, 147, 150, 154, 157, 161, 164, 168, 182 and 196	PK measurement of the time to maximum plasma naltrexone concentration (Tmax) after dosing on Day 140
Median AUC0-inf of Naltrexone (After 6th Dose)	6th dose: Day 140 (1, 2, 4, 8 & 12 hours), 141, 141.5, 141.75, 142, 143, 145, 147, 150, 154, 157, 161, 164, 168, 182 and 196	PK measurement of the area under the plasma concentration-time curve for naltrexone from time 0 extrapolated to infinity (AUC0-inf) after dosing on Day 140
Median Tmax of Naltrexone (After 1st Dose)	1st dose: Day 0 (predose), 1, 2, 4, 8, 12 hours, 24 hours (Day 1), Days 1.5, 1.75, 2, 3, 5, 7, 10, 14, 17, 21, 24, and 28.	Single-dose PK measurement of the time to maximum plasma naltrexone concentration (Tmax) after dosing on Day 0
Median AUC0-inf of Naltrexone (After 1st Dose)	1st dose: Day 0 (predose), 1, 2, 4, 8, 12 hours, 24 hours (Day 1), Days 1.5, 1.75, 2, 3, 5, 7, 10, 14, 17, 21, 24, and 28.	Single-dose PK measurement of the area under the plasma concentration-time curve for naltrexone from time 0 extrapolated to infinity (AUC0-inf) after dosing on Day 0
Median Tmax of 6β-naltrexol (After 1st Dose)	1st dose: Day 0 (predose), 1, 2, 4, 8, 12 hours, 24 hours (Day 1), Days 1.5, 1.75, 2, 3, 5, 7, 10, 14, 17, 21, 24, and 28.	Single-dose PK measurement of the time to maximum plasma 6β-naltrexol concentration (Tmax) after dosing on Day 0
Median AUC0-inf of 6β-naltrexol (After 1st Dose)	1st dose: Day 0 (predose), 1, 2, 4, 8, 12 hours, 24 hours (Day 1), Days 1.5, 1.75, 2, 3, 5, 7, 10, 14, 17, 21, 24, and 28.	Single-dose PK measurement of the area under the plasma concentration-time curve for 6β-naltrexol from time 0 extrapolated to infinity (AUC0-inf) after dosing on Day 0
Median Ctrough of 6β-naltrexol (After 1st Dose)	1st dose: Day 0 (predose), 1, 2, 4, 8, 12 hours, 24 hours (Day 1), Days 1.5, 1.75, 2, 3, 5, 7, 10, 14, 17, 21, 24, and 28.	Single-dose PK measurement of 6β-naltrexol concentration at the end of the dosing interval (Ctrough) after dosing on Day 0
Median Cmax of Naltrexone (After 6th Dose)	6th dose: Day 140 (1, 2, 4, 8 & 12 hours), 141, 141.5, 141.75, 142, 143, 145, 147, 150, 154, 157, 161, 164, 168, 182 and 196	PK measurement of the maximum observed plasma naltrexone concentration (Cmax) after 6th dose on Day 140
Median Cmax of 6β-naltrexol (After 6th Dose)	6th dose: Day 140 (1, 2, 4, 8 & 12 hours), 141, 141.5, 141.75, 142, 143, 145, 147, 150, 154, 157, 161, 164, 168, 182 and 196	PK measurement of the maximum observed plasma 6β-naltrexol concentration (Cmax) after dosing on Day 140
Median Tmax of 6β-naltrexol (After th Dose)	6th dose: Day 140 (1, 2, 4, 8 & 12 hours), 141, 141.5, 141.75, 142, 143, 145, 147, 150, 154, 157, 161, 164, 168, 182 and 196	PK measurement of the time to maximum plasma 6β-naltrexol concentration (Tmax) after dosing on Day 140
Median Ctrough of 6β-naltrexol (After 6th Dose)	6th dose: Day 140 (1, 2, 4, 8 & 12 hours), 141, 141.5, 141.75, 142, 143, 145, 147, 150, 154, 157, 161, 164, 168, 182 and 196	PK measurement of 6β-naltrexol concentration at the end of the dosing interval (Ctrough) after dosing on Day 140
Median AUC0-inf of 6β-naltrexol (After 6th Dose)	6th dose: Day 140 (1, 2, 4, 8 & 12 hours), 141, 141.5, 141.75, 142, 143, 145, 147, 150, 154, 157, 161, 164, 168, 182 and 196	PK measurement of the area under the plasma concentration-time curve for 6β-naltrexol from time 0 extrapolated to infinity (AUC0-inf) after dosing on Day 140

Secondary Outcome Measures

Name	Time	Method
6β-naltrexol Accumulation Ratio (AR) for AUC0-inf	196 days after the 6th dose	The 6β-naltrexol AR was determined for AUC0-inf by dividing the PK parameter for Dose 6 by the PK parameter for Dose 1.
6β-naltrexol Accumulation Ratio (AR) for Ctrough	196 days after the 6th dose	The 6β-naltrexol AR was determined for Ctrough by dividing the PK parameter for Dose 6 by the PK parameter for Dose 1.
Adverse Events (AEs)	Up to Day 196	Proportion of participants reporting AEs
Naltrexone Accumulation Ratio (AR) for Cmax	196 days after the 6th dose	The naltrexone AR was determined for Cmax by dividing the PK parameter for Dose 6 by the PK parameter for Dose 1.
Naltrexone Accumulation Ratio (AR) for AUC0-inf	196 days after the 6th dose	The naltrexone AR was determined for AUC0-inf by dividing the PK parameter for Dose 6 by the PK parameter for Dose 1.
Naltrexone Accumulation Ratio (AR) for Ctrough	196 days after the 6th dose	The naltrexone AR was determined for Crough by dividing the PK parameter for Dose 6 by the PK parameter for Dose 1.
6β-naltrexol Accumulation Ratio (AR) for Cmax	196 days after the 6th dose	The 6β-naltrexol AR was determined for Cmax by dividing the PK parameter for Dose 6 by the PK parameter for Dose 1.