Comparative Study Of Pregabalin And Gabapentin As Adjunctive Therapy In Subjects With Partial Seizures

This study has been completed.
Information provided by (Responsible Party):
Pfizer Identifier:
First received: September 28, 2007
Last updated: August 19, 2013
Last verified: August 2013

To compare the efficacy of pregabalin and gabapentin, as adjunctive therapy in subjects with partial seizures.

Condition Intervention Phase
Partial Seizure Disorder
Epilepsies, Partial
Complex Partial Seizure Disorder
Drug: Pregabalin
Drug: Gabapentin
Phase 4

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Safety/Efficacy Study
Intervention Model: Parallel Assignment
Masking: Double Blind (Subject, Caregiver, Investigator)
Primary Purpose: Treatment
Official Title: A Randomized, Double-Blind, Parallel-Group, Multi-Center, Comparative, Flexible Dose Trial Of Pregabalin Versus Gabapentin As Adjunctive Therapy In Subjects With Partial Seizures

Resource links provided by NLM:

Further study details as provided by Pfizer:

Primary Outcome Measures:
  • Change in seizure count frequency from baseline to endpoint, calculated as the percent change in seizure frequency during the maintenance phase of treatment compared to baseline. [ Time Frame: 27 weeks ] [ Designated as safety issue: No ]

Secondary Outcome Measures:
  • Responder rate, defined as the proportion of subjects who had at least a 50% reduction in seizure rate during the maintenance phase, as measured from baseline. [ Time Frame: 27 weeks ] [ Designated as safety issue: No ]
  • Proportion of subjects who had at least a 75% reduction in seizure rate during the maintenance phase, as measured from baseline. [ Time Frame: 27 weeks ] [ Designated as safety issue: No ]
  • Time to dose maintenance following seizure freedom. [ Time Frame: 27 weeks ] [ Designated as safety issue: No ]
  • Change from baseline to trial end on the Medical Outcomes Study-Sleep Scale. [ Time Frame: 22 weeks ] [ Designated as safety issue: No ]
  • Seizure free rate defined as proportion of subjects with no seizure during the maintenance phase, as measured from baseline. [ Time Frame: 27 weeks ] [ Designated as safety issue: No ]
  • Change in frequency of secondarily generalized tonic-clonic (SGTC) seizures. [ Time Frame: 27 weeks ] [ Designated as safety issue: No ]
  • Change from baseline to trial end on the Hospital Anxiety and Depression Scale (HADS). [ Time Frame: 22 weeks ] [ Designated as safety issue: No ]
  • Safety and tolerability of pregabalin and gabapentin [ Time Frame: 27 weeks ] [ Designated as safety issue: Yes ]

Enrollment: 488
Study Start Date: February 2008
Study Completion Date: July 2013
Primary Completion Date: July 2013 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Active Comparator: A Drug: Pregabalin
150, 300, 450 mg/day administered orally TID, until seizure control/improvement or intolerable side effects
Active Comparator: B Drug: Gabapentin
300, 600, 1200, 2000 mg/day administered orally TID, until seizure control/improvement or intolerable side effects


Ages Eligible for Study:   18 Years to 80 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Subjects (male or female) must be > 18 years or ≤ 80 years of age, with a diagnosis of epilepsy with partial seizures, as defined in the International League Against Epilepsy (ILAE) classification of seizures; partial seizures may be simple or complex, with or without secondary tonic-clonic generalization.
  • Subjects must be have been diagnosed with epilepsy for at least 2 years, and must have been unresponsive to treatment with at least two but no more than five prior antiepileptic drugs (AEDs), and at the time of study enrollment are on stable dosages of 1 or 2 standard AEDs.
  • They must have had a 12 lead electrocardiogram (ECG) without clinically significant abnormal findings prior to randomization.
  • Subjects must have had magnetic resonance imaging or contrast enhance computed tomography scan of the brain that demonstrated no progressive structural central nervous system abnormality at the time of the diagnosis of epilepsy.
  • Women of childbearing potential must be established on an effective method of contraception during the study. Women should also have a negative pregnancy test prior to study entry.
  • During the 6-week baseline period, subjects must have had a minimum of four partial seizures, with no 28 day period free of partial seizures with or without secondary generalization. A caregiver or witness must be with the subject for a sufficient duration to accurately chronicle the occurrence of seizures. These seizures must have been documented in the subject's diary.
  • Subjects with electroencephalograph (EEG) testing done within 2 years of randomization. EEG abnormalities should be consistent with a diagnosis of focal-onset epilepsy.
  • Signed and dated informed consent will be obtained from each subject (only include those able to consent) in accordance with the local regulatory and legal requirements.
  • Subjects who are willing and able to comply with scheduled visits, treatment plan, laboratory tests, and other trial procedures. Subjects who are willing, but need assistance for self administered questionnaires may be considered acceptable, but must first be discussed on a case-by-case basis with the Pfizer monitor prior to any to any screening tests or procedures for the study.

Exclusion Criteria:

  • Females who are pregnant, breastfeeding, or intending to become pregnant during the course of the trial.
  • Subjects with other neurologic illness that could impair endpoint assessment, or patients with Lennox-Gastaut syndrome, absence seizures, status epilepticus within the 12 months prior to study entry, or with seizures due to an underlying medical illness or metabolic syndrome.
  • Subjects with clinically significant liver disease or with a calculated creatinine clearance of <60mL/min.
  • Subjects with a history of lack of response, hypersensitivity or poor tolerability to gabapentin or pregabalin.
  • Previous use of gabapentin or pregabalin within 2 weeks prior to screening or likelihood of engaging in these treatments during the study period.
  • Use of prohibited medications as listed in the protocol in the absence of appropriate washout phase or the likelihood of requiring treatment during the study period with drugs not permitted by the study protocol.
  • Participation in any other studies involving investigational or marketed products, concomitantly or within 30 days prior to entry in the study.
  • Other severe acute or chronic medical or psychiatric condition or laboratory abnormality that may increase the risk associated with trial participation or investigational product administration or may interfere with the interpretation of trial results and, in the judgment of the investigator, would make the subject inappropriate for entry into this trial.
  • Subjects who are not suitable to be treated with pregabalin or gabapentin according to the respective local labeling.
  • Subjects with a history of retinal abnormalities or treatment with retinotoxic agents.
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Please refer to this study by its identifier: NCT00537940

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Sponsors and Collaborators
Study Director: Pfizer Call Center Pfizer
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Additional Information:
No publications provided

Responsible Party: Pfizer Identifier: NCT00537940     History of Changes
Other Study ID Numbers: A0081143
Study First Received: September 28, 2007
Last Updated: August 19, 2013
Health Authority: Spain: Agencia Española del Medicamento y Productos Sanitarios

Additional relevant MeSH terms:
Epilepsies, Partial
Epilepsy, Complex Partial
Brain Diseases
Central Nervous System Diseases
Nervous System Diseases
Neurologic Manifestations
Signs and Symptoms
Sensory System Agents
Peripheral Nervous System Agents
Physiological Effects of Drugs
Pharmacologic Actions
Central Nervous System Agents
Therapeutic Uses
Antiparkinson Agents
Anti-Dyskinesia Agents
Calcium Channel Blockers
Membrane Transport Modulators
Molecular Mechanisms of Pharmacological Action
Cardiovascular Agents
Anti-Anxiety Agents
Tranquilizing Agents
Central Nervous System Depressants
Psychotropic Drugs
Excitatory Amino Acid Antagonists processed this record on July 29, 2014