Drug Drug Interaction Study With Gabapentin Enacarbil and Morphine

NCT01476124 | Completed Phase 1

• 1 other identifier: 115720
• Study Type: interventional
• Target: 18
• Locations: 1 country
• Sites: 1

Brief Summary

This double-blind study will evaluate the pharmacokinetics of a single dose of morphine or gabapentin derived from gabapentin enacarbil (GEn) after administration of morphine and GEn alone and in combination as well as the tolerability of morphine administered with GEn. The dose of GEn will be 600 mg administered with food. Morphine/morphine placebo will be administered 2 hours prior to GEn/GEn placebo in the fasted state. A 60 mg dose of a controlled release formulation of morphine will be given. Blood samples for evaluation of gabapentin, morphine and morphine-6-glucuronide will be collected. The pharmacodynamic effect of co-administering both treatments will be assessed using visual analog scales for somnolence/sedation, dizziness and nausea.

Conditions

Restless Legs Syndrome

Outcome Measures

Primary Outcomes (1)

• Pharmacokinetics

  evaluate the pharmacokinetics of morphine, morphine-6-glucuronide and of gabapentin derived from GEn following administration of single doses of morphine (60 mg) and GEn (600 mg) alone and in combination

  7 days

Secondary Outcomes (2)

• Profile of Pharmacokinetics

  predose,1,2,3,4,5,6,7,8,9,10,11,12,14,16,18,20,24,26,and 36 hours post dose

• Safety of Patients treated with Gen

  Screening to follow-up

Study Arms (3)

Regimen A

EXPERIMENTAL

Morphine placebo + GEn 600 mg

Drug: morphine Placebo; Drug: GEn 600 mg

Regimen B

EXPERIMENTAL

Morphine Extended release (60 mg) + GEn placebo

Drug: Morphine; Drug: GEn Placebo

Regimen C

EXPERIMENTAL

Morphine Extended release (60mg) + GEn 600 mg

Drug: GEn 600 mg; Drug: Morphine

Interventions

morphine Placebo DRUG

Morphine Placebo

Regimen A

GEn 600 mg DRUG

Gabapentin enacarbil 600 mg

Also known as: XP13512, GSK1838262

Regimen A; Regimen C

Morphine DRUG

morphine extended release 60 mg

Regimen B; Regimen C

GEn Placebo DRUG

Gabapentin enacarbil placebo

Regimen B

Eligibility Criteria

• Age: 18 Years - 65 Years
• Sex: male
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• Subject is healthy as determined by a responsible physician, based on a medical evaluation including medical history, physical examination, clinical laboratory tests, and 12 lead 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
• Subject is a male between 18 and 65 years of age inclusive, at the time of signing the informed consent
• Subject has a body weight \>55 kg and body mass index (BMI) within the range of 19 to 30 kg/m2 (inclusive)
• Subject is capable of giving written informed consent, which includes compliance with the requirements and restrictions listed in the informed consent form
• Subject has a QTcB \<450 ms
• Subject has a creatinine clearance (CrCl) \>80 mL/min. The CrCl is estimated using the Cockcroft and Gault equation. Details on CrCl calculations are provided in the Study Procedures Manual (SPM)
• Subject has an aspartate aminotransferase (AST), ALT, and alkaline phosphatase within reference range at the screening visit. Isolated bilirubin \>1.5 × ULN is acceptable if bilirubin is fractionated and direct bilirubin \<35% of the total bilirubin

You may not qualify if:

• Subject has positive prestudy drug or alcohol screen results. At minimum, the drug screen will include alcohol, cotinine, amphetamines, barbiturates, cocaine, opiates, cannabinoids, and benzodiazepines
• Subject has positive prestudy (within 3 months of Screening) hepatitis B surface antigen or positive hepatitis C antibody results
• Subject has a positive prestudy human immunodeficiency virus (HIV) antibody result
• Subject has a history of regular alcohol consumption within 6 months of the study defined as: an average intake of \>14 drinks/week . One drink is equivalent to (12 g of 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.
• Subject has participated in a clinical trial and has received an investigational product within the following time period before 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)
• Subject has been exposed to more than 4 new chemical entities within 12 months before the first dosing day
• Subject has used prescription or nonprescription 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) before the first dose of study treatment, unless in the opinion of the investigator and GSK Medical Monitor the medication will not interfere with the study procedures or compromise subject safety.
• Subject has a history of sensitivity to gabapentin, morphine, or components thereof, or a history of drug or other allergy that, in the opinion of the investigator or GSK Medical Monitor, contraindicates participation in the study
• Subject's participation in the study would result in donation of blood or blood products in excess of 500 mL within a 56-day period
• Subject is unwilling or unable to follow the procedures outlined in the protocol
• Subject has a screening heart rate \<45 or \>100 bpm, systolic blood pressure \>140 or \<100 mm Hg, or diastolic blood pressure \>90 or \<60 mm Hg in the semi supine position and the value(s) do not return to within reference range upon retest.
• Subject has postural hypotension demonstrated at the screening medical ( defined as a fall in systolic pressure of 30mmHg or more and/or a fall in diastolic pressure of 20mmHg or more after standing for 3 minutes) or a history of clinically significant symptomatic postural hypotension or vaso vagal episodes
• Subject smokes more than 5 cigarettes or equivalent/day. Subjects should continue their smoking/non-smoking habits throughout the study apart from refraining from smoking on study days
• Subject has a history or presence of clinically significant cardiovascular, pulmonary, hepatic, renal, hematologic, GI, endocrine, immunologic, dermatologic, neurologic or psychiatric disease
• Subject has a history of seizures other than febrile seizures as a child

Sponsors & Collaborators

• XenoPort, Inc.: lead

Study Sites (1)

GSK Investigational Site

Austin, Texas, 78744, United States

Location

Related Publications (1)

• Chen C, Upward J, Arumugham T, Stier B, Davy M. Gabapentin enacarbil and morphine administered in combination versus alone: a double-blind, randomized, pharmacokinetic, and tolerability comparison. Clin Ther. 2015 Feb 1;37(2):349-57. doi: 10.1016/j.clinthera.2014.10.015. Epub 2014 Nov 20.

  PMID: 25467190 DERIVED

MeSH Terms

Conditions

Restless Legs Syndrome

Interventions

1-(((alpha-isobutanoyloxyethoxy)carbonyl)aminomethyl)-1-cyclohexaneacetic acid; Morphine

Condition Hierarchy (Ancestors)

Nervous System Diseases; Sleep Disorders, Intrinsic; Dyssomnias; Sleep Wake Disorders; Parasomnias; Mental Disorders

Intervention Hierarchy (Ancestors)

Morphine Derivatives; Morphinans; Opiate Alkaloids; Alkaloids; Heterocyclic Compounds; Heterocyclic Compounds, Bridged-Ring; Heterocyclic Compounds, 4 or More Rings; Heterocyclic Compounds, Fused-Ring; Phenanthrenes; Polycyclic Aromatic Hydrocarbons; Polycyclic Compounds

Study Officials

• GSK Clinical Trials

  GlaxoSmithKline

  STUDY DIRECTOR

Study Design

• Study Type: interventional
• Phase: phase 1
• Allocation: RANDOMIZED
• Masking: DOUBLE
• Who Masked: PARTICIPANT, INVESTIGATOR
• Purpose: TREATMENT
• Intervention Model: CROSSOVER
• Sponsor Type: INDUSTRY
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: August 25, 2011
• First Posted: November 22, 2011
• Study Start: August 1, 2011
• Primary Completion: October 1, 2011
• Study Completion: October 1, 2011
• Last Updated: July 16, 2013

Record last verified: 2011-11

Locations

US (1)