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A Study of the Efficacy and Safety of Topiramate in the Treatment of Patients With Difficult to Control Epilepsy

This study has been completed.
Information provided by:
Johnson & Johnson Pharmaceutical Research & Development, L.L.C. Identifier:
First received: October 7, 2005
Last updated: June 6, 2011
Last verified: January 2011
The purpose of the study is to evaluate the effectiveness and safety of topiramate as add-on therapy in patients with difficult to control partial onset seizures who are taking one or two standard anti-epileptic drugs.

Condition Intervention Phase
Epilepsies, Partial
Drug: topiramate
Phase 2

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double-Blind
Primary Purpose: Treatment
Official Title: Double-Blind Parallel Comparison of Three Doses of Topiramate and Placebo in Refractory Partial Epilepsy

Resource links provided by NLM:

Further study details as provided by Johnson & Johnson Pharmaceutical Research & Development, L.L.C.:

Primary Outcome Measures:
  • Percent reduction in the average monthly seizure rate from baseline to end of treatment

Secondary Outcome Measures:
  • Percent of patients responding to treatment (>= 50% reduction in seizure rate from baseline to end of treatment); patient's and investigator's global assessments at end of study; incidence of adverse events throughout study

Enrollment: 178
Study Start Date: June 1988
Study Completion Date: December 1990
Detailed Description:
Epilepsy is characterized by seizures, which are abnormal electrical discharges in the brain that temporarily disrupt normal brain function. Seizures are classified as "generalized," originating in both sides of the brain simultaneously, or "partial-onset," starting in one area of the brain. Antiepilepsy medications, such as topiramate, are selected based on seizure type. This is a double-blind, placebo-controlled study that includes a baseline phase and a treatment phase. During the baseline phase (12 weeks duration), patients receive one or two of the following standard antiepileptic drugs (AEDs): phenytoin, carbamazepine, phenobarbital, or primidone. Patients who continue to have seizures during treatment with standard AEDs proceed into the double-blind treatment phase. Patients then receive placebo or topiramate at a dosage of 100-milligrams (mg) once daily, increasing to twice daily dosing at a maximum dose of 200 mg/day, 400 mg/day, or 600 mg/day or maximum tolerated dose (depending on treatment group), through Week 16 (total duration of double-blind phase), while continuing on their standard AED regimen. Assessments of effectiveness include the percent reduction in the average monthly seizure rate, percent of patients responding to treatment (having equal to or greater than 50% reduction in seizure rate), and, the patient's and investigator's global assessments of medication at end of study. Safety assessments include the incidence of adverse events throughout the study, clinical laboratory tests (hematology, serum chemistry, urinalysis), neurologic examinations, and vital sign measurements (blood pressure, pulse, temperature) weekly during the treatment phase. The study hypothesis is that topiramate, taken as add-on therapy to treatment with AEDs, will significantly reduce seizure frequency, compared with placebo, in patients with refractory partial epilepsy and is well-tolerated. Topiramate, 100 milligrams[mg] oral tablets. Dosage begins at 100-mg once daily and increases gradually to twice daily dosing at a maximum dose of 200, 400, or 600 mg/day, and continues through Week 16 (total duration).

Ages Eligible for Study:   18 Years to 65 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • History of simple or complex partial epilepsy that has been documented or witnessed
  • during a 12-week baseline phase, patient must have at least 12 partial seizures while maintaining therapeutic levels of antiepileptic drugs (AEDs)
  • and have no more than one seizure-free interval of up to 3 weeks and none longer than 3 weeks
  • good physical health.

Exclusion Criteria:

  • Patients having solely generalized seizures or lacking documentation of partial epilepsy
  • patients with generalized tonic-clonic seizures or other generalized epilepsies in the absence of an EEG consistent with partial epilepsy
  • generalized seizures, which are defined by the EEG wave pattern
  • seizures that lack an abnormal pulsation pattern on EEG
  • females who are capable of having children
  Contacts and Locations
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Please refer to this study by its identifier: NCT00236730

Sponsors and Collaborators
Johnson & Johnson Pharmaceutical Research & Development, L.L.C.
Study Director: Johnson & Johnson Pharmaceutical Research & Development, L.L. C. Clinical Trial Johnson & Johnson Pharmaceutical Research & Development, L.L.C.
  More Information

Additional Information:
Publications: Identifier: NCT00236730     History of Changes
Other Study ID Numbers: CR005458
Study First Received: October 7, 2005
Last Updated: June 6, 2011

Keywords provided by Johnson & Johnson Pharmaceutical Research & Development, L.L.C.:
partial epilepsies
partial epilepsy
epileptic seizures
partial seizure disorder
brain diseases

Additional relevant MeSH terms:
Epilepsies, Partial
Brain Diseases
Central Nervous System Diseases
Nervous System Diseases
Neurologic Manifestations
Signs and Symptoms
Neuroprotective Agents
Protective Agents
Physiological Effects of Drugs
Anti-Obesity Agents processed this record on May 24, 2017