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Assessment of the Efficacy and Safety of 2 Doses of Retigabine Immediate Release (900 mg/Day and 600 mg/Day) Used as Adjunctive Therapy in Adult Asian Subjects With Drug-resistant Partial-onset Seizures

NCT01648101 · Status: TERMINATED · Phase: PHASE3 · Type: INTERVENTIONAL · Enrollment: 76

Last updated 2018-08-13

Study results available
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Summary

The immediate release (IR) formulation of retigabine has been shown to be superior to placebo as adjunctive therapy in 3 adequate and well-controlled studies in subjects with drug-resistant partial-onset seizures (POS) who had previously failed to respond to two or more antiepileptic drugs (AEDs) and were still having seizures despite current treatment with 1, 2, or 3 AEDs. However, of 1244 subjects randomly assigned to treatment in these 3 clinical studies, only 10 were Asian subjects and only 5 of these Asian subjects were randomly assigned to treatment with retigabine. Therefore, this Phase III study is being conducted to evaluate the efficacy, safety and tolerability, and health outcomes of retigabine, at doses of 900 mg/day and 600 mg/day, compared with placebo in adult Asian subjects with drug-resistant POS.

Conditions

Interventions

DRUG

Retigabine 900mg/day

Study drug will be administered three times a day in a double blind manner. The starting dose of retigabine will be 300 mg/day. This dose will be increased by 150 mg/day per week to reach the target dose of 900mg/day over a 4 week Titration Phase). The subject will then continue to receive 900mg/day for the next 12 weeks (Maintenance Phase). Eligible subjects will then be offered an opportunity to enter an open label extension (OLE) study. After a 4 week transition phase, eligible subjects will start the OLE on retigabine 900mg/day.

DRUG

Retigabine 600mg/day

Study drug will be administered three times a day in a double blind manner. The starting dose of retigabine will be 300mg/day. This dose will be increased by 150 mg/day per week to reach the target dose of 600mg/day over 2 weeks. The subject will then continue to receive 600mg/day for the next 14 weeks (2 weeks of the Titration Phase and 12 weeks of the Maintenance Phase). Eligible subjects will then be offered an opportunity to enter an open label extension (OLE) study. After a 4 week Transition Phase (3 weeks on retigabine 600mg/day, 1 week on retigabine 750mg/day) eligible subjects will start the OLE on retigabine 900mg/day.

OTHER

Placebo

Study drug will be administered three times a day in a double blind manner. Subjects randomised to placebo will receive the same number, size and colour of tablets as the 600mg/day and 900mg/day treatment arms for the duration of the 4 week Titration Phase and the 12 week Maintenance Phase. Eligible subjects will then be offered an opportunity to enter an open label extension (OLE) study. The starting dose of retigabine will be 300 mg/day. This dose will be increased by 150 mg/day per week to reach dose of 750mg/day over the 4 weeks of the Transition Phase. On completion of the Transition Phase eligible subjects will start the OLE on retigabine 900mg/day.

Sponsors & Collaborators

Principal Investigators

  • GSK Clinical Trials · GlaxoSmithKline

Study Design

Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
QUADRUPLE
Model
PARALLEL

Eligibility

Min Age
18 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2012-08-29
Primary Completion
2013-12-01
Completion
2013-12-23

Countries

  • Hong Kong
  • Malaysia
  • Philippines
  • Singapore
  • South Korea
  • Taiwan
  • Thailand

Study Locations

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Entities

Diseases
Companies

Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT01648101 on ClinicalTrials.gov