A Study of the Effectiveness and Safety of Topiramate Compared With a Standard Therapy in Patients Newly Diagnosed With Epilepsy

Condition(s) targeted: Epilepsy; Seizures

Intervention: topiramate (Drug)

Phase: Phase 3

Status: Completed

Sponsored by: Johnson & Johnson Pharmaceutical Research & Development, L.L.C.

Official(s) and/or principal investigator(s):
Johnson & Johnson Pharmaceutical Research and Development, L.L.C. Clinical Trial, Study Director, Affiliation: Johnson & Johnson Pharmaceutical Research & Development, L.L.C.

The purpose of this study is to compare the effectiveness and safety of topiramate to standard antiepileptic drugs in children and adults with newly diagnosed epilepsy.

Official title: TOPAMAX (Topiramate) Monotherapy Comparison Trial to Standard Monotherapy in the Treatment of Newly Diagnosed Epilepsy (RWJ-17021-000); Phase IIIB

Study design: Treatment, Randomized, Double-Blind, Active Control, Parallel Assignment, Safety/Efficacy Study

Primary outcome: Time to first seizure from Day 15 of the study.

Secondary outcome: Time to first seizure from Day 1 of the study; time to exit from the study; proportion of seizure-free patients during the last 6 months of the double-blind period; safety evaluations conducted throughout the study.

Detailed description: Topiramate is a drug that is currently widely used for the treatment of seizures in adults and pediatric patients (2 to 16 years of age). This is a randomized, double-blind, parallel-group study to evaluate the effectiveness and safety of two dosages of topiramate (100 or 200mg per day) compared with standard antiepileptic drugs (carbamazepine or valproate) in patients with newly diagnosed epilepsy. The study is composed of three phases: baseline (up to 7 days), double-blind treatment, and a blinded extension. The double-blind phase is divided into two periods: titration, in which the dose of drug is gradually increased (approximately 35 days), and stabilization (of variable duration, with regular scheduled visits up to 92 days and then every 3 months thereafter). The dose of study drug remains constant during the stabilization period. In the blinded extension, patients completing the double blind phase are given the opportunity to take the other study medication in a blinded fashion (patient unaware of identity of the drug). This phase continues until the patient leaves the study or the data base for the double blind phase is finalized. The primary assessment of effectiveness is the time to first seizure from Day 15 of the study. Safety assessments include the frequency of adverse events during the study, results of clinical laboratory tests (hematology and biochemistry), measurements of vital signs and body weight, and physical examination findings. The study hypothesis is that the 200mg dose of topiramate is superior to the 100mg dose in delaying the time to first seizure and is well-tolerated.

Oral topiramate (25milligram [mg] or 50mg capsules or tablets),starting at 25mg/day (Week 1),increasing to 100mg or 200mg/day (Week 5).Increasing carbamazepine to 600mg/day or valproate to 1250mg/day (Week 5).Maximum dosages continue for a variable time and then taper over 4 weeks to starting dose.

Minimum age: 6 Years. Maximum age: N/A. Gender(s): Both.

Criteria:

Inclusion Criteria:

- Body weight of at least 30 kilograms

- Epilepsy diagnosis and at least one unprovoked seizure within 3 months before study

entry

- No history of antiepileptic drug use or taking a single antiepileptic drug for no

longer than 6 weeks

- Females must be sexually abstinent, surgically sterile, or using adequate birth

control measures, and have a negative pregnancy test before study entry

Exclusion Criteria:

- Patients who do not have epilepsy

- Have progressive or degenerative disorders (for example, certain hereditary

conditions)

- Have a significant history (within last 2 years) of unstable medical diseases (heart,

kidney, hormone, or liver diseases)

- Have mental retardation or other condition that could make interpretation of the study

results difficult

- Alcohol or drug abuse within the previous year

A study of the effectiveness and safety of topiramate compared with a standard single medicine therapy in patients newly diagnosed with epilepsy

Starting date: August 1997
Ending date: November 2000
Last updated: May 11, 2007