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Carisbamate Retention Study (CaReS): Comparative Study on the Long Term Effectiveness, Safety and Tolerability of Carisbamate Compared to Two Other Frequently Prescribed Anti-epileptic Drugs (AEDs) in Patients With Epilepsy.

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00563459
Recruitment Status : Terminated (Carisbamate partial onset seizures studies lacked consistent efficacy data so trials in this indication were terminated.)
First Posted : November 26, 2007
Last Update Posted : January 29, 2013
Information provided by (Responsible Party):
SK Life Science, Inc.

Brief Summary:
The purpose of this research study is to compare the long term effectiveness, safety and tolerability of carisbamate compared to two other frequently prescribed anti-epileptic drugs (AEDs) in patients with epilepsy.

Condition or disease Intervention/treatment Phase
Epilepsy Seizures Drug: carisbamate Drug: topiramate Drug: levetiracetam Phase 3

Detailed Description:
Following a protocol amendment, this study resumed recruitment from April 10 to September 4, 2009. This is a randomized, double-blind, parallel-group, active-comparator, multi-center study. The study consists of 5 phases: pretreatment (screening), double-blind titration phase, double blind maintenance phase, a transition phase, and an open-label phase. Patients who are not eligible or choose not to enter the transition and open-label phases of the study will complete an exit phase following double-blind treatment.The primary outcome variable is long term retention rate and safety of adjunctive therapy with carisbamate vs. topiramate and levetiracetam over a six month period. This primary endpoint is a clinically meaningful measure of efficacy, safety and tolerability over time, reflecting the therapeutic effectiveness of antiepileptic drugs (AEDs). Safety evaluations including adverse event monitoring, blood tests, and vital signs will be conducted throughout the study.The hypothesis is that the 3 study medications at a minimum will have similar treatment retention rates, but based on their distinct efficacy and side effect profiles, will have discernible differences in the rates of selected adverse events and reasons for treatment discontinuation in patients with partial onset siezures. Patients must be on at least 1, but not more than 2, baseline AEDs for 30 days prior to screening. By end of week 8 patients must have reached the following minimum dosages of study drug to be permitted to continue: carisbamate 400 mg/day, topiramate 200 mg/day, or levetiracetam 1000 mg/day. Double-blind phases last approximately 12 months. Carisbamate 800 mg/day, topiramate 300 mg/day and levetiracetam 2000mg/day will be administered orally in two equally divided doses.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 89 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Triple (Participant, Care Provider, Investigator)
Primary Purpose: Treatment
Official Title: A Randomized, Double-Blind, Parallel-Group, Multicenter Study to Evaluate the Retention Rate, Efficacy, Safety, and Tolerability of Carisbamate, Topiramate and Levetiracetam as Adjunctive Therapy in Subjects With Partial Onset Seizures
Study Start Date : November 2007
Actual Primary Completion Date : April 2010
Actual Study Completion Date : April 2010

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Epilepsy Seizures

Arm Intervention/treatment
Experimental: 001
carisbamate 400-1200 mg/day for 12 months
Drug: carisbamate
400-1200 mg/day for 12 months

Active Comparator: 002
topiramate 200-400mg/day for 12 months
Drug: topiramate
200-400mg/day for 12 months

Active Comparator: 003
levetiracetam 1000-3000mg/day for 12 months
Drug: levetiracetam
1000-3000mg/day for 12 months

Primary Outcome Measures :
  1. The primary efficacy endpoint is time from the first intake of study medication to discontinuation (all causes) of study medication during the 6 month core double-blind phase. [ Time Frame: A six month period ]

Secondary Outcome Measures :
  1. Cognitive side effect profiles of CRS and TPM [ Time Frame: At 6 and 12 month periods ]
  2. Neuropsychiatric side effect profiles of CRS and LEV [ Time Frame: At 6 and 12 month periods ]
  3. Reasons for discontinuation among the 3 treatment arms [ Time Frame: At 6 and 12 month periods ]
  4. Seizures rates among the 3 treatment arms [ Time Frame: At 6 and 12 month periods ]
  5. Subject reported mood states, behavioral and cognitive side effect changes among the 3 treatment arms [ Time Frame: At 6 and 12 month periods ]

Information from the National Library of Medicine

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Ages Eligible for Study:   16 Years and older   (Child, Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Patients must weigh >= 45 kg (~100lbs)
  • established diagnosis, for at least 3 months prior to screening, of partial onset seizures, including simple partial motor, complex partial, or secondarily generalized seizures
  • At least 1 but no more than 120 partial onset seizures during the 3-month retrospective baseline period prior to screening
  • History of monotherapy AED treatment failure at at least 1 but not more than 4 AEDs in the past
  • Females must be postmenopausal for at least 2 years, surgically sterile, abstinent, or, if sexually active, practicing an acceptable method of birth control (eg, intrauterine device, double barrier method, male partner sterilization) before entry and throughout the study
  • Females must have a negative serum beta chorionic gonadotropin pregnancy test result at screening/randomization
  • Current AED treatment with at least 1 and no more than 2 AEDs given at a stable dose 30 days prior to screening
  • For adolescents (as defined by local regulations), a responsible person must be available to accompany the patient to the study center at each visit, to provide reliable information for the safety and effectiveness evaluations, and to accurately and reliably dispense the study drug as directed, if required in the opinion of the investigator.

Exclusion Criteria:

  • Must not have a generalized epileptic syndrome, primary generalized seizures, atonic seizures, typical or atypical absence seizures nor only simple partial type seizures with manifestations other than motor symptoms (i.e, simple partial sensory)
  • No history of unprovoked status epilepticus in the last 6 months prior to screening nor history of Lennox-Gastaut or West Syndrome
  • More than 3 days of sedative or benzodiazepine use for seizures in the 3 months months prior to screening
  • No clinical evidence of significant cardiac disease
  • ALT > 1.5 times the upper limit of normal or total bilirubin above the upper limit of normal at screen
  • No history of drug-induced liver injury, diagnosis of any form of chronic liver disease, cirrhosis, or liver cancer nor positive hepatitis serology as determined by multiantigen enzyme immunoassay (EIA)
  • No past or current with topiramate or levetiracetam for any reason
  • No current use of vagal nerve stimulator
  • No diagnosis of psychotic disorder, bipolar disease, or major depression or other neurologic conditions, serious or medically unstable systemic disease, suicidal ideation or attempts, or homicide attempts at any time in the past 2 years
  • Unable to swallow solid oral dosage forms whole with the aid of water (patients may not chew, divide, dissolve, or crush the study drug)
  • Anyone who falls under the precautions, warnings or contraindications outlined in the local topiramate and/or local levetiracetam package insert.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00563459

Sponsors and Collaborators
SK Life Science, Inc.
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Study Director: Ortho-McNeil Janssen Scientific Affairs, LLC Clinical Trial Ortho-McNeil Janssen Scientific Affairs, LLC
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Responsible Party: SK Life Science, Inc. Identifier: NCT00563459    
Other Study ID Numbers: CR014317
Carisbamate Retention Study
EudraCT # 2007-02929-78
First Posted: November 26, 2007    Key Record Dates
Last Update Posted: January 29, 2013
Last Verified: January 2013
Keywords provided by SK Life Science, Inc.:
Epilepsy, seizures
partial onset seizures
anti-epileptic drugs (AED)
Additional relevant MeSH terms:
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Brain Diseases
Central Nervous System Diseases
Nervous System Diseases
Neurologic Manifestations
Hypoglycemic Agents
Physiological Effects of Drugs
Nootropic Agents