A Drug Interaction Study of VI-0521 With Metformin, Sitagliptan and Probenecid in Healthy Subjects.

January 20, 2010 updated by: VIVUS LLC

A Phase I, Single-Center, Open-Label, Non-randomized, One-Sequence Crossover, Pharmacokinetic Interaction Study of the Combination Product VI-0521 (Phentermine Plus Topiramate) With Metformin, Sitagliptin or Probenecid in Healthy Subjects

The purposes of this study are to:

  • Find out how much of the study drugs are in the blood of healthy subjects after taking multiple doses of VI-0521, metformin and sitagliptan.
  • Determine the effect of probenecid on the amount of VI-0521 in the blood of healthy subjects after taking multiple doses.
  • Find out how much topiramate is in the semen of healthy male subjects after taking multiple doses.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

This trial is an open-label, non-randomized, one-sequence crossover study. All subjects will receive an oral dose of metformin 500 mg tablet twice daily on Days 1 to 5 and on Days 30 to 34; an oral dose of sitagliptin 100 mg tablet once daily on Days 6 to 10 and on Days 35 to 39 and a single oral dose of VI-0521 (phentermine/topiramate) capsule once daily each morning at 3.75/23 mg for 2 days (Days 11-12), 7.5/46 mg for 3 days (Days 13-15), 11.25/69 mg for 3 days (Days 16-18) and 15/92 mg for 21 days (Days 19-39) plus a single oral dose of 2 g (four 500 mg) probenecid tablets on Day 29.

Subjects will remain at the site for the duration of the study (from Day -1 to Day 40). Blood samples for the determination of metformin concentrations in plasma will be collected at 0 (pre-dose), 1, 2, 3, 4, 6, 8 and 12 hours after the morning administration of metformin or metformin plus VI-0521 on Days 5 and 34. Blood samples for the determination of sitagliptin concentrations in plasma will be collected at 0 (pre-dose), 1, 2, 3, 4, 5, 7, 10, 16 and 24 hours after the administration of sitagliptin or sitagliptin plus VI-0521 on Days 10 and 39. Blood samples for the determination of phentermine and topiramate concentrations in plasma will be collected at 0 (pre-dose), 1, 2, 3, 4, 5, 7, 10, 16 and 24 hours after the administration of the investigational product(s) on Days 28, 29, 34 and 39. Pre-dose blood samples for determination of the investigational drug concentrations in plasma will be taken in the morning on Days 4 and 33 for metformin; Days 9 and 38 for sitagliptin and Days 27, 33 and 38 for phentermine and topiramate. Semen samples for determination of topiramate concentrations will be collected on Day 28 between five and seven hours after VI-0521 administration in 8 male non-vasectomized subjects to obtain at least 6 evaluable subjects.

The primary endpoints of this study will be the PK parameters AUC0-τ and Cmax of phentermine, topiramate, sitagliptin and metformin.The secondary endpoint is the topiramate concentration in semen.

Study Type

Interventional

Enrollment (Actual)

20

Phase

  • Phase 1

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • Arizona
      • Phoenix, Arizona, United States, 85283
        • MDS Pharma Services

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

19 years to 45 years (Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • The study population will consist of adult healthy males or females, 19-45 years of age; inclusive who are medically healthy with no clinically significant screening results.

Exclusion Criteria:

  • Main exclusion criteria include a history or presence of significant cardiovascular, neurological, hematological, psychiatric, hepatic, gastrointestinal, pulmonary, endocrine, immunologic or renal disease or other condition known to interfere with the absorption, distribution, metabolism, or excretion of drugs or place the subjects at increased risk as determined by the Investigator; any clinically significant laboratory abnormalities as judged by the Investigator; any history of glaucoma, increased intraocular pressure, or medications to treat increased intraocular pressure; presence of cholelithiasis or cholecystitis within the last 6 months that has not been surgically treated with cholecystectomy; any history of a cardiovascular or cerebrovascular event; any active malignancy except basal cell carcinoma; systolic blood pressure > 150 mm Hg or diastolic blood pressure > 95 mm Hg at screening or at check-in (Two rechecks are allowed); positive drug/alcohol test at screening or check in; blood donation or significant blood loss within 56 days of dosing; plasma donation within 7 days of dosing. In female subjects, a positive pregnancy test at screening or check-in is exclusionary.

Study Plan

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

How is the study designed?

Design Details

  • Allocation: Non-Randomized
  • Interventional Model: Crossover Assignment
  • Masking: None (Open Label)

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
The primary endpoints of this study will be the PK parameters AUC0-τ and Cmax of phentermine, topiramate, sitagliptin and metformin.
Time Frame: 40 days
40 days

Secondary Outcome Measures

Outcome Measure
Time Frame
The secondary endpoint is the topiramate concentration in semen.
Time Frame: 40 days
40 days

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

VIVUS LLC

Investigators

  • Study Director: Shiyin Yee, VIVUS LLC

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

February 1, 2009

Primary Completion (Actual)

March 1, 2009

Study Completion (Actual)

April 1, 2009

Study Registration Dates

First Submitted

February 6, 2009

First Submitted That Met QC Criteria

February 10, 2009

First Posted (Estimate)

February 12, 2009

Study Record Updates

Last Update Posted (Estimate)

January 21, 2010

Last Update Submitted That Met QC Criteria

January 20, 2010

Last Verified

January 1, 2010

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • OB-107

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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