Multiple Dose Pharmacokinetics Depot Buprenorphine in Opioid-Dependent Subjects

Indivior

Status and phase: Completed; Phase 2

Conditions: Opioid Related Disorder

Treatments: Drug: Subutex; Drug: RBP-6000

Study type: Interventional

Funder types: Industry

Identifiers

NCT01738503

RB-US-12-0005

Details and patient eligibility

About

This is an open-label study in treatment seeking opioid-dependent subjects for safety, tolerability, pharmacokinetics (PK), efficacy markers, and opioid receptor availability of subcutaneous injections of depot buprenorphine after induction and stabilization of treatment seeking subjects onto Subutex.

Subjects were planned to receive 4 subcutaneous (SC) injections of RBP-6000 separated by 28 days (Cohorts 1-5) or 6 SC injections of RBP-6000 separated by 28 days (Cohort 6) after a 13-day induction and dose stabilisation period on SUBUTEX Sublingual (SL) tablet at dose levels of 8-24 mg.

Full description

• Open-label SUBUTEX Sublingual Tablet Induction and Stabilisation Period After completing the screening period, subjects entered an open-label SUBUTEX SL tablet induction and stabilisation period to achieve stable daily doses of 8 mg, 12 mg, 14 mg, 24 mg or 8 - 24 mg (variable) during a 13 day inpatient (Day -14 to Day -1) period.

• Open-label Treatment Phase On Day 1, eligible subjects discontinued use of SUBUTEX SL tablet and received a subcutaneous (SC) injection of RBP-6000. The dose of RBP-6000 received and the cohort to which a subject was assigned depended upon the SUBUTEX SL tablet dose on Day -1.

  • Injection 1 (Day 1): 3 days inpatient post-dose (Day 1 to Day 3) and outpatient visits (Day 4 to Day 28); serial pharmacokinetic (PK) samples
  • Injection 2 (Day 29): 60-hour inpatient pre-dose and post-dose (Day 28 to Day 31) and outpatient visits (Day 32 to Day 56); sparse PK samples
  • Injection 3 (Day 57): 60-hour inpatient pre-dose and post-dose (Day 56 to Day 59) and outpatient visits (Day 60 to Day 84); sparse PK samples
  • Injection 4 (Day 85): 60-hour inpatient pre-dose and post-dose (Day 84 to Day 87) and outpatient visits (Day 88 to Day 113 [or Day 112 for Cohort 6]); serial PK samples
  • Cohort 6 ONLY: Injection 5 (Day 113): 60-hour inpatient pre-dose and post-dose (Day 112 to Day 115) and outpatient visits (Day 116 to Day 140); serial PK samples
  • Cohort 6 ONLY: Injection 6 (Day 141): 60-hour inpatient pre- and post-dose (Day 140 to Day 143) and outpatient visits (Day 144 to Day 169); serial PK samples
  • Safety Follow-up: weekly visits up to 60 days post-Injection 4 (PK Day 114 to Day 141) for subjects in Cohorts 1-5 who did not take part in the positron emission tomography (PET) imaging sub-study and up to 60 days post-Injection 6 (PK Day 169 to Day 197) for subjects in Cohort 6

The objective of the PET imaging sub-study was to evaluate the relationship between buprenorphine plasma levels and the ability of the 200 mg and 300 mg doses of RBP-6000 to reduce mu-opioid receptor availability measured with [11C]carfentanil and positron emission tomography (PET) scans. This objective was exploratory in nature and results are not reported as part of these summary results.

Enrollment: 124 patients

Sex: All

Ages: 18 to 65 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Male and female subjects
• Agree not to take any buprenorphine products other than those administered for the current study throughout participation in the study
• Body mass index (BMI) of >18.0 to < 33.0 kg/m

Exclusion criteria

• Participants with a current diagnosis requiring chronic opioid treatment
• Participants with a history of risk factors of Torsades de Pointes (e.g., heart failure, hypokalemia, family history of Long QT Syndrome) or an ECG demonstrating a Fridericia's corrected QT interval (QTcF) >450 msec in males and QTcF > 470 in females at screening
• Abuse of buprenorphine or use of buprenorphine within 14 days of informed consent

Trial design

Primary purpose: Treatment

Allocation: Non-Randomized

Interventional model: Parallel Assignment

Masking: None (Open label)

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124 participants in 6 patient groups

(8 mg) RBP-6000: 50 mg

Experimental group

Description:

Participants are stabilized by day -5 on Subutex 8 mg. During the study, four subcutaneous (SC) injections containing RBP-6000 50 mg are given at 28 day intervals.

Treatment:

Drug: RBP-6000

Drug: Subutex

(12 mg) RBP-6000: 100 mg

Experimental group

Description:

Participants are stabilized by day -5 on Subutex 12 mg. During the study, four subcutaneous (SC) injections containing RBP-6000 100 mg are given at 28 day intervals

Treatment:

Drug: RBP-6000

Drug: Subutex

(24 mg) RBP-6000: 200 mg

Experimental group

Description:

Participants are stabilized by day -5 on Subutex 24 mg. During the study, four subcutaneous (SC) injections containing RBP-6000 200 mg are given at 28 day intervals. Participants who receive RBP-6000 containing 200 mg buprenorphine and reach Day 112 (and have received all 4 planned SC injections) have the option to participate in the Positron Emission Tomography (PET) Pilot substudy. In the PET Pilot sub-study participants remain on 200 mg SC injections at 28 day intervals for an additional 6-9 intervals until they complete an magnetic resonance imaging (MRI) and a PET scan and pharmacokinetic samples at week 1 and week 4 post injection.

Treatment:

Drug: RBP-6000

Drug: Subutex

(8 mg) RBP-6000: 100 mg

Experimental group

Description:

Participants are stabilized by day -5 on Subutex 8 mg. During the study, four subcutaneous (SC) injections containing RBP-6000 100 mg are given at 28 day intervals.

Treatment:

Drug: RBP-6000

Drug: Subutex

(14 mg) RBP-6000: 200 mg

Experimental group

Description:

Participants are stabilized by day -5 on Subutex 14 mg. During the study, four subcutaneous (SC) injections containing RBP-6000 200 mg are given at 28 day intervals. Participants who receive RBP-6000 containing 200 mg buprenorphine and reach Day 112 (and have received all 4 planned SC injections) have the option to participate in the Positron Emission Tomography (PET) Pilot substudy. In the PET Pilot sub-study participants remain on 200 mg SC injections at 28 day intervals for an additional 6-9 intervals until they complete an magnetic resonance imaging (MRI) and a PET scan and pharmacokinetic samples at week 1 and week 4 post injection.

Treatment:

Drug: RBP-6000

Drug: Subutex

(8-24 mg) RBP-6000: 300 mg

Experimental group

Description:

Participants are stabilized by day -5 on a Subutex between 8-24 mg. During the study, four subcutaneous (SC) injections containing RBP-6000 300 mg are given at 28 day intervals.

Treatment:

Drug: RBP-6000

Drug: Subutex