Pharmacokinetic Study of Two HIV Protease Inhibitors in Patients

February 5, 2009 updated by: University of Oklahoma

The Pharmacokinetics of Lopinavir/Ritonavir in Combination With Atazanavir in HIV-Infected Subjects

The objective of this study is to determine the pharmacokinetics of lopinavir, ritonavir, and atazanavir when lopinavir/ritonavir and atazanavir are used in combination.

Study Overview

Status

Terminated

Conditions

Intervention / Treatment

Detailed Description

Thirty patients with HIV infection will be enrolled in this open-label, parallel arm pharmacokinetic study. Subjects receiving either lopinavir/ritonavir or atazanavir/ritonavir as part of their antiretroviral therapy will have a pharmacokinetic study performed over 12-20 days to examine whether coadministration of lopinavir and atazanavir alters the pharmacokinetics of either agent. The safety of these agents in combination will also be explored.

Study Type

Interventional

Enrollment (Actual)

19

Phase

  • Phase 4

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
    • Oklahoma
      • Oklahoma City, Oklahoma, United States, 73104
        • OUHSC General Clinical Research Center

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

18 years to 60 years (Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  • HIV-seropositive
  • Currently receiving atazanavir/ritonavir or lopinavir/ritonavir in combination with 2-3 nucleoside RT inhibitors or are antiretroviral treatment-naïve
  • If female, is not of childbearing potential or is of childbearing potential and agrees to use a barrier method of contraception throughout the study

Exclusion Criteria:

  • HIV-1 RNA > 400 copies/mL if currently receiving antiretroviral therapy
  • Concurrent use of CYP450 inhibitors or inducers
  • Concurrent use of P-glycoprotein substrates, inhibitors, or inducers
  • Concurrent use of medications known to interact with ritonavir or atazanavir
  • Presence of a chronic health condition deemed by the investigators to potentially impair lopinavir, ritonavir, or atazanavir pharmacokinetics
  • Presence of conduction abnormalities on electrocardiogram
  • Women who are pregnant or breastfeeding

  • Laboratory Abnormalities at baseline:

    • Aminotransferases > 3x ULN
    • Serum bilirubin > 5x ULN
    • Serum creatinine > 1.5x ULN
    • Hemoglobin concentration < 8.0 g/dL
    • Absolute neutrophil count < 800 cells/μL
    • Platelet count < 50,000 cells/μL

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

  • Primary Purpose: Treatment
  • Allocation: Non-Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Arm A
Subjects on atazanavir/ritonavir will add lopinavir/ritonavir.
Drug: lopinavir/ritonavir
Lopinavir/ritonavir 400 mg/100 mg twice daily on Days 6-16, then 800 mg/200 mg daily on Days 17-21.
Other Names:
  • Kaletra 200 mg/50 mg tablets
Experimental: Arm B
Subjects on lopinavir/ritonavir will add atazanavir.
Drug: atazanavir
Atazanavir 300 mg daily on Days 6-12.
Other Names:
  • Reyataz 300 mg capsules

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Mean pharmacokinetic parameters (Cmax, Cmin, AUC) for lopinavir, ritonavir, atazanavir
Time Frame: Day 6, Day 12 or 16, Day 20
Day 6, Day 12 or 16, Day 20

Secondary Outcome Measures

Outcome Measure
Time Frame
Safety (e.g., GI tolerance, lab abnormalities, ECG changes)
Time Frame: Day 6, Day 12 or Day 16, Day 20
Day 6, Day 12 or Day 16, Day 20

Collaborators and Investigators

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

Sponsor

University of Oklahoma

Collaborators

Abbott

Investigators

  • Principal Investigator: R. Chris Rathbun, Pharm.D., University of Oklahoma

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

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

April 1, 2007

Primary Completion (Actual)

October 1, 2007

Study Completion (Actual)

September 1, 2008

Study Registration Dates

First Submitted

January 9, 2007

First Submitted That Met QC Criteria

January 9, 2007

First Posted (Estimate)

January 11, 2007

Study Record Updates

Last Update Posted (Estimate)

February 6, 2009

Last Update Submitted That Met QC Criteria

February 5, 2009

Last Verified

February 1, 2009

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 12637

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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