A Study to Evaluate the Effect of Gabapentin on Cardiac Repolarization in Healthy Volunteers

This study has been completed.
Sponsor:
Information provided by (Responsible Party):
XenoPort, Inc.
ClinicalTrials.gov Identifier:
NCT01516372
First received: January 19, 2012
Last updated: July 15, 2013
Last verified: April 2012
  Purpose

This will be a randomized, double-blind, placebo- controlled cross-over study to investigate the effect of GEn on cardiac repolarisation parameters compared with placebo and a positive control, moxifloxacin. Approximately 52 subjects will be recruited to the study and will take part in four dosing sessions. Subjects will receive, in a randomized order, a single dose of 1200 mg GEn, 6000 mg GEn (supratherapeutic dose), 400 mg moxifloxacin (positive control) and placebo. Twelve lead continuous ECG monitoring will be conducted from pre-dose to approximately 24 hours after dosing on Day 1 of each study session. The primary comparison of interest will be the mean change from baseline in the time-matched differences in QTcF between each GEn treatment and placebo.


Condition Intervention Phase
Restless Legs Syndrome
Drug: GEn 1200mg
Drug: Gen 6000 mg
Drug: GEn Placebo
Drug: Moxifloxacin Placebo
Drug: Moxifloxacin
Phase 1

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Safety Study
Intervention Model: Crossover Assignment
Masking: Double Blind (Subject, Investigator)
Primary Purpose: Basic Science
Official Title: A Randomized, Double-blind, Single Dose Crossover Study to Assess the Effect of Gabapentin Enacarbil on Cardiac Conduction as Compared With Placebo and Moxifloxacin in Healthy Volunteers

Resource links provided by NLM:


Further study details as provided by XenoPort, Inc.:

Primary Outcome Measures:
  • Change in QTcF (QT duration corrected for heart rate by Fridericia's formula) interval at Each time point for 6000 mg GEn and Placebo measured by ECG [ Time Frame: Day -1-Day2 ] [ Designated as safety issue: Yes ]

Secondary Outcome Measures:
  • Change in QTcF interval at Each time point for 1200 mg GEn and Placebo measured by ECG [ Time Frame: Day -1-Day 2 ] [ Designated as safety issue: Yes ]
  • Change from baseline in QTcF interval at each time point for moxifloxacin 400 mg and placebo measured by ECG [ Time Frame: Day -1-Day 2 ] [ Designated as safety issue: Yes ]
  • Change from baseline in QTcB (QT duration corrected for heart rate by Bazett's formula), QT for GEn (1200 mg and 6000 mg) and moxifloxacin (400 mg) and placebo measured by ECG [ Time Frame: Day -1-Day 2 ] [ Designated as safety issue: Yes ]
  • Change from baseline in PR, QRS intervals, heart rate and ECG waveform morphology for GEn (1200 mg and 6000 mg) and placebo measured by ECG [ Time Frame: Day -1-Day 2 ] [ Designated as safety issue: Yes ]
  • Change from baseline in heart rate and ECG waveform morphology for moxifloxacin (400 mg) [ Time Frame: Day -1-Day 2 ] [ Designated as safety issue: Yes ]
  • Pharmacokinetic parameters for gabapentin and moxifloxacin [ Time Frame: Day -1-Day 2 ] [ Designated as safety issue: Yes ]
  • Safety parameters: AEs, vital signs, ECGs, Columbia Suicide Severity Rating Scale (C-SSRS) and clinical laboratory parameters [ Time Frame: Day -1-Day 2 ] [ Designated as safety issue: Yes ]

Enrollment: 52
Study Start Date: January 2012
Study Completion Date: March 2012
Primary Completion Date: March 2012 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: Treatment 1
Healthy Volunteers will receive Treatments ABDC
Drug: GEn 1200mg
1200 mg of Gen administered as a single dose
Other Name: gen1200
Drug: Moxifloxacin Placebo
Placebo to match Moxifloxacin
Other Name: moxifloxacin placebo
Experimental: Treatment 2
Healthy Volunteers will receive Treatments BCAD
Drug: Gen 6000 mg
6000 mg of Gen administered as a single dose
Other Name: gen6000
Drug: Moxifloxacin Placebo
Placebo to match Moxifloxacin
Other Name: moxifloxacin placebo
Experimental: Treatment 3
Healthy Volunteers will receive Treatments CDBA
Drug: GEn Placebo
Placebo to match GEn Tablets
Other Name: gen placebo
Experimental: Treatment 4
Healthy Volunteers will receive Treatments DACB
Drug: GEn Placebo
Placebo to match GEn Tablets
Other Name: gen placebo
Drug: Moxifloxacin
400 mg Moxifloxacin administered as a single dose
Other Name: moxifloxacin 400

Detailed Description:

This is a 4-period, randomized, active-and placebo-controlled, double-dummy, double-blind cross-over study to evaluate the effect of single doses of GEn on cardiac conduction parameters in healthy subjects.

Screening will occur within approximately 28 days of the first scheduled dose of study medication. Each subject will participate in 4 dosing sessions at least one week apart. Prior to dosing in each period, the investigator will review the scheduled assessments to confirm the subject's suitability for the study including review of study entry criteria and lifestyle restrictions.

All subjects will receive single doses of GEn 1200 mg, GEn 6000 mg, moxifloxacin 400 mg and placebo in a randomized sequence.

Dosing with moxifloxacin will be in the fasted state and GEn will be administered following a standard meal. A double dummy approach will be used to maintain blinding. Thus, on each dosing day, moxifloxacin or moxifloxacin placebo will be administered in the fasted state in the morning and GEn or matched placebo will be administered 2 hours later after a standard meal.

During each treatment period, subjects will report to the clinical research unit the day before dosing (Day 1) and will remain until completion of the last assessment on Day 2. Twelve-lead ECGs including continuous Holter monitoring, clinical laboratory safety tests, vital sign measurements, physical examinations, adverse event reports, and pharmacokinetic samples will be collected throughout the study.

In each study period, cardiac conduction will be measured using a 24-hour continuous 12-lead Holter monitor from the morning of Day 1 until the morning of Day 2. Extraction of the Holter monitor data in triplicate for analysis will begin on Day 1 at timepoints indicated in the Time and Events Table (Section 4.7). These timepoints were selected to cover the Cmax of both moxifloxacin and GEn. If no clinically significant abnormalities are noted, subjects will be discharged from the clinical research unit after the completion of all assessments on Day 2 in each period. A minimum 7-day washout period will separate each treatment period. A follow-up visit will be conducted approximately 7 to 14 days after administration of the last dose of study medication in treatment period 4

  Eligibility

Ages Eligible for Study:   18 Years to 50 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   Yes
Criteria

Inclusion Criteria:

  • Healthy as determined by a responsible physician, based on a medical evaluation including medical history, physical examination, laboratory tests and ECG. A subject with a clinical abnormality or laboratory parameters outside the reference range for the population being studied may be included only if the Investigator and the GSK Medical Monitor agree that the finding is unlikely to introduce additional risk factors and will not interfere with the study procedures
  • Male or female between 18 and 50 years of age inclusive, at the time of signing the informed consent.
  • A female subject is eligible to participate if she is of: Non-childbearing potential defined as pre-menopausal females with a documented tubal ligation or hysterectomy; or postmenopausal defined as 12 months of spontaneous amenorrhea [in questionable cases a blood sample with simultaneous follicle stimulating hormone (FSH) greater than 40 MlU/ml and estradiol less than 40 pg/ml (less than 147 pmol/L) is confirmatory]. Females on hormone replacement therapy (HRT) and whose menopausal status is in doubt will be required to use one of the contraception methods in Section 8.1 if they wish to continue their HRT during the study. Otherwise, they must discontinue HRT to allow confirmation of post-menopausal status prior to study enrollment. For most forms of HRT, at least 2-4 weeks will elapse between the cessation of therapy and the blood draw; this interval depends on the type and dosage of HRT. Following confirmation of their post-menopausal status, they can resume use of HRT during the study without use of a contraceptive method; Child-bearing potential and agrees to use one of the contraception methods listed in the protocol for an appropriate period of time (as determined by the product label or investigator) prior to the start of dosing to sufficiently minimize the risk of pregnancy at that point. Female subjects must agree to use contraception until the follow-up visit is completed.

Body weight greater than and equal to 50 kg and BMI within the range 19 - 30 kg/m2 (inclusive)

  • Capable of giving written informed consent, which includes compliance with the requirements and restrictions listed in the consent form
  • Creatinine clearance (CrCl) greater than and equal to 80 mL/min. CrCl is estimated using the equation of Cockcroft and Gault. See study procedure manual for details on creatinine clearance calculations.
  • AST, ALT, alkaline phosphatase and bilirubin less than and equal to 1.5xULN (isolated bilirubin greater than and equal to 1.5xULN is acceptable if bilirubin is fractionated and direct bilirubin less than 35%).

Exclusion Criteria:

  • The subject has a positive pre-study drug/alcohol screen. A minimum list of drugs that will be screened for include amphetamines, barbiturates, cocaine, opiates, cannabinoids and benzodiazepines
  • A positive pre-study Hepatitis B surface antigen or positive Hepatitis C antibody result within 3 months of screening.
  • A positive test for HIV antibody.
  • Has cardiac conduction abnormalities on the screening 12-lead ECG denoted by any of the following: QTcB or QTcF interval greater than 450 msec; PR interval greater than 200 msec or less than and equal to 110 msec; Evidence of second- or third- degree atrioventricular block (AVB); Pathological Q-waves (defined as Q-wave greater than 40 msec or depth greater than 0.4- 0.5mV); Evidence of ventricular pre-excitation; Electrocardiographic evidence of complete left bundle branch block (LBBB), right bundle branch block (RBBB), incomplete LBBB; Intraventricular conduction delay with QRS duration greater than 120 msec
  • The subject has a screening heart rate less than 50 or greater than 100 bpm or a systolic blood pressure greater than 140 or less than 100 mmHg or a diastolic blood pressure greater than 90 or ;ess than 60 mmHg in the semisupine position
  • Subjects with a personal or family history of QTc prolongation, symptomatic cardiac arrhythmias or cardiac arrest
  • Serum calcium, magnesium or potassium levels outside the reference range
  • History of regular alcohol consumption within 6 months of the study defined as: an average weekly intake of greater than 14 drinks/week for men or greater than 7 drinks/week for women. One drink is equivalent to (12 g alcohol) = 5 ounces (150 ml) of wine or 12 ounces (360 ml) of beer or 1.5 ounces (45 ml) of 80 proof distilled spirits.
  • The subject has participated in a clinical trial and has received an investigational product within the following time period prior to the first dosing day in the current study: 30 days, 5 half-lives or twice the duration of the biological effect of the investigational product (whichever is longer)
  • Exposure to more than four new chemical entities within 12 months prior to the first dosing day
  • Use of prescription or non-prescription drugs, including vitamins, herbal and dietary supplements (including St John's Wort) within 7 days (or 14 days if the drug is a potential enzyme inducer) or 5 half-lives (whichever is longer) prior to the first dose of study medication, unless in the opinion of the Investigator and GSK Medical Monitor the medication will not interfere with the study procedures or compromise subject safety. Hormone replacement therapy and contraceptive medication will be allowed in this study.
  • History of sensitivity to quinolone antibiotics, gabapentin, or components thereof or a history of drug or other allergy that, in the opinion of the investigator or GSK Medical Monitor, contraindicates their participation.
  • Where participation in the study would result in donation of blood or blood products in excess of 500 mL within a 56 day period.
  • Lactating females or pregnant females as determined by positive serum hCG test at screening or prior to dosing.
  • Urinary cotinine levels indicative of smoking or history or regular use of tobacco- or nicotine-containing products within 3 months prior to screening.
  • History of seizures other than febrile seizures as a child.
  • Subjects with a creatine kinase (CK) value of greater than the upper limit of normal that is not explainable by recent strenuous exercise and the value does not return within normal range upon retest.
  • Has active suicidal plan/intent or has had active suicidal thoughts in the past 6 months. Has history of suicide attempt in the last 2 years or more than 1 lifetime suicide attempt.
  • Subject is mentally or legally incapacitated.
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT01516372

Locations
United States, Texas
GSK Investigational Site
Austin, Texas, United States, 78744
Sponsors and Collaborators
XenoPort, Inc.
Investigators
Study Director: GSK Clinical Trials GlaxoSmithKline
  More Information

No publications provided by XenoPort, Inc.

Additional publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):
Responsible Party: XenoPort, Inc.
ClinicalTrials.gov Identifier: NCT01516372     History of Changes
Other Study ID Numbers: 114112
Study First Received: January 19, 2012
Last Updated: July 15, 2013
Health Authority: United States: Food and Drug Administration

Keywords provided by XenoPort, Inc.:
GEn, moxifloxacin, cardiac repolarisation, QT/QTc

Additional relevant MeSH terms:
Restless Legs Syndrome
Dyssomnias
Mental Disorders
Nervous System Diseases
Parasomnias
Sleep Disorders
Sleep Disorders, Intrinsic
Moxifloxacin
Norgestimate, ethinyl estradiol drug combination
Anti-Bacterial Agents
Anti-Infective Agents
Antineoplastic Agents
Contraceptive Agents
Contraceptive Agents, Female
Contraceptives, Oral
Contraceptives, Oral, Combined
Enzyme Inhibitors
Molecular Mechanisms of Pharmacological Action
Pharmacologic Actions
Physiological Effects of Drugs
Reproductive Control Agents
Therapeutic Uses
Topoisomerase II Inhibitors
Topoisomerase Inhibitors

ClinicalTrials.gov processed this record on October 22, 2014