Glyburide Healthy Volunteer Study

Glyburide is a medication that has been safely used for several decades to treat non-insulin dependent diabetes. This pilot study seeks to evaluate whether glyburide, administered at the lowest dose (1.5 mg/dL daily) to healthy (non-diabetic) subjects is safe both physically and cognitively. The investigators are hopeful that the results of this study will provide the necessary foundation to evaluate this medication's use on a larger scale to determine the feasibility of using glyburide in soldiers either prophylactically or for the treatment of brain injury.

Study Overview

• Status: Completed
• Conditions: Healthy Volunteers
• Intervention / Treatment: Drug: Placebo; Drug: Glyburide

Detailed Description

This study is a placebo controlled (2:1 drug vs. placebo), randomized clinical trial of 21 healthy, non-diabetic volunteers receiving daily doses of oral glyburide (1.5 mg) vs. placebo while under careful medical monitoring in an inpatient Clinical Research Unit (CRU)within the Center for Applied Research Sciences (CARS) at the Washington University in St. Louis Medical Center for a duration of 7 days and nights (24 hours per day). Interested subjects who call for more information about the study will be scheduled for a screening visit. Subjects will participate first in an informed consent process, and those wishing to take part will be asked to undergo a comprehensive interview detailing their past medical history and formal physical examination (which includes laboratory tests of the urine and blood). If a subject is deemed appropriate by the team, he/she will be asked to perform an exercise test (treadmill for 30 minutes) and will have an Electrocardiogram (ECG) completed to further determine eligibility. Individuals who do not meet inclusion criteria based on screening activities will be notified immediately that they are not eligible. Volunteers meeting all eligibility criteria will be scheduled for the week long in-patient evaluation.

Each subject will undergo a battery of physical, cognitive, and laboratory tests in addition to receiving oral glyburide or placebo each day for one week.

• Study Type: Interventional
• Enrollment (Actual): 21
• Phase: Phase 1

Contacts and Locations

Study Locations

• United States
  • Missouri
    • St. Louis, Missouri, United States, 63110
      • Washington University in St. Louis Clinical Research Unit (CRU)

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 40 years (Adult)
• Accepts Healthy Volunteers: Yes
• Genders Eligible for Study: All

Description

Inclusion Criteria:

• Volunteers between the ages of 18 and 40.
• Have a Body Mass Index (BMI) between 18-30.
• Normal screening physical examination (non-pregnant as confirmed by serum Beta HcG,non-diabetic as confirmed by normal Hgb A-1C, normal baseline ECG and vital signs, laboratory values within normal limits (the lab tests include: complete blood count, electrolytes, liver function tests, kidney function tests, uric acid, cholesterol, iron, urinalysis, urine drug screen; all are conducted within 2 weeks prior to randomization).
• Women of Childbearing Potential (WCP) demonstrate a willingness to use contraception methods (other than birth control medications) to prevent pregnancy from time of consent to 30 days past last dose. **Note, birth control medications MAY BE used after completion of the inpatient hospital phase of the study (i.e. after discharge).
• Unremarkable past medical history.
• Ability to provide informed consent.
• Ability to undergo physical exercise (determined through a treadmill exercise test to ensure physical fitness of participants). Those who experience fatigue, dizziness or chest pain during the screening exercise test on the treadmill will be excluded.
• Ability to undergo neuropsychological test for attention, cognition, dexterity, etc.
• Willing to remain in the in-patient setting for the duration of the study.

Exclusion Criteria:

• Use of investigational drug within 4 weeks of study.
• Using tobacco.
• Acute illness or surgery within 4 weeks of study.
• Allergic to sulfonylurea-related drugs.
• Presence of pathological condition of any part of the body.
• Any medication within 2 weeks of the study, including oral contraceptives.
• Ingestion of alcohol or caffeine containing food or beverages within 48 hours of start of study.
• History of alcohol or drug abuse, cardiac arrhythmias, psychotropic agent use, immunosuppressive condition (i.e. HIV, AIDS, Cancer) or hepatitis.
• Donation of blood within 3 months or receiving blood products within 14 days.
• Recent body tattoo or piercing.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Triple

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Active Comparator: Glyburide; 1.5 mg (lowest dose) by mouth every day with breakfast for 7 days	Drug: Glyburide; Other Names: Micronase; Glybencamide
Placebo Comparator: Sugar Pill (Capsule); Matching placebo capsule by mouth every day with breakfast for 7 days	Drug: Placebo; Other Names: Sugar Pill (capsule)

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Number of Participants with Adverse Events	The primary objective of this study is to evaluate the safety of glyburide in healthy, non-diabetic volunteers while simulating strenuous activity to observe for any adverse events (i.e. hypoglycemia, dizziness, confusion, etc.). Neuropsychological testing, physical exams, vital signs, ECGs, cognitive assessments, and laboratory values (including serum glucose levels collected 4 x's per day and as needed) will be conducted throughout the 7 day in-patient study to assess for any adverse/serious adverse events.	7 days

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Cognitive impact	Determine the impact after 7 days of glyburide 1.5mg daily (with breakfast) in healthy volunteers who are able to participate in scheduled strenuous activities and adhere to a structured meal plan on cognitive performance using a computer program to test cognition before study drug administration and at the end of the study in addition to daily physical examinations which include mini mental status exams.	7 days

Collaborators and Investigators

• Sponsor: Washington University School of Medicine
• Collaborators: University of Maryland; United States Department of Defense

Study record dates

Study Major Dates

• Study Start: January 1, 2013
• Primary Completion (Actual): May 1, 2014
• Study Completion (Actual): August 1, 2014

Study Registration Dates

• First Submitted: October 12, 2012
• First Submitted That Met QC Criteria: October 24, 2012
• First Posted (Estimate): October 29, 2012

Study Record Updates

• Last Update Posted (Estimate): September 16, 2014
• Last Update Submitted That Met QC Criteria: September 15, 2014
• Last Verified: September 1, 2014

More Information

Terms related to this study

• Keywords: hypoglycemia; glyburide; glybenclamide
• Additional Relevant MeSH Terms: Hypoglycemic Agents; Physiological Effects of Drugs; Glyburide
• Other Study ID Numbers: A-15112.b