Completed

A Multi-Center, Double Blind, Placebo-controlled, Randomized, Parallel Group Evaluation of the Efficacy of a Flexible Dose of Lamotrigine Versus Placebo As Add-On Therapy In Schizophrenia

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What is being tested

Data Collection

Who is being recruted

Mental Disorders

+ Schizophrenia

+ Schizophrenia Spectrum and Other Psychotic Disorders

From 18 to 65 Years
See all eligibility criteria
How is the trial designed

Treatment Study

Phase 3
Interventional
Study Start: August 2003
See protocol details

Summary

Principal SponsorGlaxoSmithKline
Last updated: January 14, 2026
Sourced from a government-validated database.Claim as a partner

Study start date: August 1, 2003

Actual date on which the first participant was enrolled.

The objective of this study is to evaluate the effectiveness of a marketed drug in the treatment of schizophrenia, as an add-on therapy to antipsychotics over a 12-week period. Subjects with schizophrenia who have been maintained on a stable dose of antipsychotics and who fulfill the screening entrance criteria will have an assessment 1-7 days after the first visit to confirm eligibility.

Official TitleA Multi-Center, Double Blind, Placebo-controlled, Randomized, Parallel Group Evaluation of the Efficacy of a Flexible Dose of Lamotrigine Versus Placebo As Add-On Therapy In Schizophrenia 
NCT00071747
Principal SponsorGlaxoSmithKline
Last updated: January 14, 2026
Sourced from a government-validated database.Claim as a partner

Protocol

This section provides details of the study plan, including how the study is designed and what the study is measuring.
Design Details

176 patients to be enrolled

Total number of participants that the clinical trial aims to recruit.

Treatment Study

These studies test new ways to treat a disease, condition, or health issue. The goal is to see if a new drug, therapy, or approach works better or has fewer side effects than existing options.


Eligibility

Researchers look for people who fit a certain description, called eligibility criteria: person's general health condition or prior treatments.
Conditions
Criteria

Any sex

Biological sex of participants that are eligible to enroll.

From 18 to 65 Years

Range of ages for which participants are eligible to join.

Healthy volunteers not allowed

If individuals who are healthy and do not have the condition being studied can participate.

Conditions

Pathology

Mental DisordersSchizophreniaSchizophrenia Spectrum and Other Psychotic Disorders

Criteria

Inclusion criteria: * If female, must not be pregnant, or must be incapable of conceiving or be taking steps to prevent conception. * Diagnosis of Schizophrenia * Patients must be taking clozapine monotherapy or other atypical antipsychotic at least 3 months prior to this study. Exclusion criteria: * Patients who are currently taking or have taken antidepressant medication in the last month prior. * Patients who are or have been suicidal or homicidal in the last 6 months. * Patients with a history of autistic disorder or another pervasive developmental disorder * Patients whose condition is due to the direct physiological effects of a substance (e.g. a drug of abuse, a medication) or a general medical condition

Study Plan

Find out more about all the medication administered in this study, their detailed description and what they involve.
Study Objectives

Study Objectives

Primary Objectives

Secondary Objectives

Study Centers

These are the hospitals, clinics, or research facilities where the trial is being conducted. You can find the location closest to you and its status.

This study has 32 locations

Suspended

GSK Investigational Site

Little Rock, United StatesSee the location
Suspended

GSK Investigational Site

Garden Grove, United States
Suspended

GSK Investigational Site

La Mesa, United States
Suspended

GSK Investigational Site

National City, United States
Completed32 Study Centers