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Retigabine/ Ezogabine

Phase 3

Seizures | Small molecule | Neurology |GSK plc|Trials Updated: Jun 19, 2018

Retigabine/ Ezogabine target and mechanism

ModalitySmall molecule

Also known as Retigabine

Success Probability

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Market & Valuation

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Trial Design

RandomizedDouble-BlindPLACEBO_CONTROLLED
Total Trials3
Total Enrollment853

FDA Designations

No designations recorded

Retigabine/ Ezogabine clinical trials

Retigabine/ Ezogabine · 3 trials · 2 indications

Phase 3 2Phase 1 1
NCT00235755Retigabine Efficacy and Safety Trial for Partial Onset Refractory Seizures in EpilepsySeizures
COMPLETED539 Analytics
NCT00232596Retigabine (Adjunctive Therapy) Efficacy and Safety Study for Partial Onset Refractory Seizures in EpilepsySeizures
COMPLETED306 Analytics
PHASE3COMPLETED
Retigabine Efficacy and Safety Trial for Partial Onset Refractory Seizures in Epilepsy
SeizuresUnlock trial analytics
PHASE3COMPLETED
Retigabine (Adjunctive Therapy) Efficacy and Safety Study for Partial Onset Refractory Seizures in Epilepsy
SeizuresUnlock trial analytics

Study Endpoints

Primary Endpoints

Percent Change in the 28-day Total Partial Seizure (PS) Frequency From Baseline (BL) to the End of the Double-blind (DB) Phase (Titration and Maintenance Phases)
Baseline (Week -7 through Week 0), DB Phase (Week 1 through Week 16)

28-day total PS (PSs \[also called focal seizures\] are seizures limited to a specific area of the brain) frequency in the BL period = (Number \[No.\] of total PSs reported in the BL period divided by the No. of days of available total PS data in the BL period) x 28 days. 28-day total PS frequency in the DB period = (No. of total PSs reported in the DB period divided by the No. of days of available total PS data in the DB period) x 28 days. Percent change = (\[value in the DB period minus value at BL\] divided by the BL value) x 100%. Negative valu es indicate a reduction in seizure frequency.

Number of Participants Classified as Responders and Non-responders During the Maintenance Phase
Week 5 through Week 16

Responders were participants with at least a 50% reduction in the 28-day total partial seizure frequency in the Maintenance Phase as compared to the Baseline period.

Number of Participants Who Were Responders and Non-responders in the Maintenance Phase
Week 7 through Week 18

Responders were participants with at least a 50% reduction in the 28-day total partial seizure frequency in the Maintenance Phase as compared to the Baseline period.

Clearance (Cl/F), clearance during dialysis (CLD) and fraction of total clearance attributed to dialysis (FD) of ezogabine/retigabine and NAMR
During Dialysis (0-1, 1-2, 2-3, and 3-4 hour)

Pharmacokinetic parameters

AUC(0-t), AUC (0-∞), T½, Cmax, Tmax of ezogabine/retigabine and NAMR in plasma. Amount of ezogabine/retigabine and NAMR cleared by dialysis (AD)
0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 7, 8, 12, 16, 24, 36, 48, 60 and 68 hours

Pharmacokinetic parameters

Secondary Endpoints

Number of Participants Who Were Responders and Non-responders During the DB Phase
Week 1 through Week 16
Percent Change From Baseline (BL) in the 28-day Total Partial Seizure Frequency During the Maintenance Phase
Baseline (Week -7 through Week 0), Week 5 through Week 16
Number of Participants With a Reduction in the 28-day Total Partial Seizure Frequency From Baseline to the End of DB Phase (Titration and Maintenance Phases) by Indicated Quartile Reduction Categories
Baseline (Week -7 through Week 0), Week 1 through Week 16
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Study Design & Arms

AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
PlaceboPLACEBO_COMPARATOR -
Retigabine 600 mgEXPERIMENTAL -
Retigabine 900 mgEXPERIMENTAL -
RetigabineEXPERIMENTAL -
Dose-DialysisACTIVE_COMPARATORSubjects will be dosed with study drug followed by a scheduled dialysis session
Dialysis-DoseACTIVE_COMPARATORSubjects will be dosed following the completion of their scheduled dialysis session

Interventions

NameTypeDescription
RetigabineDRUGOral tablet. The starting daily dose will be 300 mg/day administered orally in three equally divided doses. This dosage will be increased by 150 mg/day (50 mg/dose) at 1-week intervals (titration phase). At the beginning of Week 3, patients will enter a 12 week maintenance phase.
PlaceboDRUGOral tablet.
Retigabine / EzogabineDRUGRetigabine / Ezogabine will be available as immediate release tablets of 50 milligrams strength. Subjects will be administered the tablet will 250 milliliters of water
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Eligibility Criteria

Age Range18 Years to 75 Years
SexALL
Healthy VolunteersNo
Study Sites70

Inclusion Criteria: * Diagnosis of refractory epilepsy with simple or complex partial onset seizures with or without secondary generalization * 28-day partial seizure frequency rate of four or more partial seizures over the 8-week baseline phase * Currently treated with up to three established AEDs...

Countries:United StatesAustraliaBelgiumFranceGermanyHungaryIsraelPolandRussiaSouth AfricaSpainUkraineUnited KingdomArgentinaBrazilCanadaMexico
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Frequently asked questions about Retigabine/ Ezogabine

What is retigabine/ezogabine used for?

Retigabine, also known as ezogabine, is used for epilepsy and seizures. It is a small molecule developed by GSK plc (ticker: GSK) as an adjunctive treatment for partial onset refractory seizures in adults. The clinical program includes trials in epilepsy and seizures, with a focus on patients whose seizures are not controlled by other therapies.

Who makes retigabine/ezogabine?

Retigabine/ezogabine is developed by GSK plc, which trades under the ticker GSK. GSK sponsored the clinical trials for this small molecule in epilepsy and seizures, including the Phase 3 efficacy and safety studies and a Phase 1 pharmacokinetic study.

What phase is retigabine/ezogabine in?

Retigabine/ezogabine has been studied in Phase 1 and Phase 3 clinical trials. The Phase 3 trials evaluated its efficacy and safety for partial onset refractory seizures in epilepsy, while a Phase 1 trial examined the effect of haemodialysis on its pharmacokinetics. All listed trials are completed.

What clinical trials is retigabine/ezogabine in?

Retigabine/ezogabine has been evaluated in completed clinical trials including NCT00235755, a Phase 3 efficacy and safety trial for partial onset refractory seizures in epilepsy with 539 participants, and NCT00232596, a Phase 3 adjunctive therapy study with 306 participants. A Phase 1 trial, NCT01480609, studied the effect of haemodialysis on its pharmacokinetics in 8 participants.

Is retigabine the same as ezogabine?

Yes, retigabine and ezogabine are the same drug. Retigabine is the international nonproprietary name, while ezogabine is the United States adopted name. Both names refer to the same small molecule developed by GSK plc for epilepsy and seizures.