Co-Administration Of Fosamprenavir With Methadone: A Drug Interaction Study. - Tabular View

Tracking Information

First Received Date ^ICMJE

May 30, 2007

Last Updated Date

February 19, 2009

Start Date ^ICMJE

February 2005

Primary Completion Date

Current Primary Outcome Measures ^ICMJE

Serial blood samples will be collected over 24 hours for measurement of plasma (R-) and (S-) methadone (days 4 and 18) and serum amprenavir concentrations (day 18).

Original Primary Outcome Measures ^ICMJE

Same as current

Change History

Complete list of historical versions of study NCT00481182 on ClinicalTrials.gov Archive Site

Current Secondary Outcome Measures ^ICMJE

On study days 4, 11, and 18, opioid effects will be assessed pre-dose, 2 hours, and 6 hours following methadone dosing. Pharmacokinetic and opioid pharmacodynamic parameters will be compared between the two treatments.

Original Secondary Outcome Measures ^ICMJE

Same as current

Descriptive Information

Brief Title ^ICMJE

Co-Administration Of Fosamprenavir With Methadone: A Drug Interaction Study.

Official Title ^ICMJE

A Phase I, Open-Label, 2-Period, Single-Sequence, Drug Interaction Study to Assess Steady-State Plasma Methadone Enantiomer Pharmacokinetics Following Co-Administration of Methadone QD With Fosamprenavir 700mg BID + RTV 100mg BID in Opiate-Dependent, HIV Seronegative, Adult Subjects

Brief Summary

To assess the combined effects of fosamprenavir 700mg BID + ritonavir 100mg BID + standardized dose of methadone, on plasma total and unbound methadone enantiomer pharmacokinetics (PK), opiate pharmacodynamic (PD) measures, and safety. The effect of methadone on plasma amprenavir PK will also be assessed by comparison to historical control data.

Detailed Description

Study Phase

Phase I

Study Type ^ICMJE

Interventional

Study Design ^ICMJE

Treatment, Non-Randomized, Open Label, Single Group Assignment, Pharmacokinetics/Dynamics Study

Condition ^ICMJE

Healthy Subjects

Intervention ^ICMJE

Drug: fosamprenavir + ritonavir + methadone

Study Arms / Comparison Groups

Publications *

* Includes publications given by the data provider as well as publications identified by National Clinical Trials Identifier (NCT ID) in Medline.

Recruitment Information

Recruitment Status ^ICMJE

Completed

Enrollment ^ICMJE

Completion Date

Primary Completion Date

Eligibility Criteria ^ICMJE

Inclusion Criteria:

Subject is enrolled in a certified methadone maintenance program for at least 12 weeks prior to Period 1, Day 1.

Subject is receiving methadone = 200mg QD that has remained unchanged for 30 days The subject is male, female and is between the age of 18 and 64 years of age.

A female is eligible to enter and participate if she is of non-childbearing potential or of childbearing potential. If of childbearing potential, females must have a negative serum pregnancy test at Screening, and agree to one of the following:

Complete abstinence from sexual intercourse from 2 weeks prior to administration of the study drug. Sexual intercourse with only vasectomized partner.

Body mass index of 19.00 to 32.00 kg/m2. Willing to refrain from the use of illicit drugs and adhere to other protocol-stated restrictions while participating in the study.

Able to understand and comply with protocol requirements and instructions and is likely to complete the study as planned.

Able to give written informed consent prior to screening.

Exclusion Criteria:

Subject has a clinically significant abnormality identified on the screening medical or laboratory evaluation, including 12-lead ECG.

Subject has any preexisting condition which could interfere with the absorption, metabolism, and/or excretion of the study drugs.

Subject currently has or has a history of decompensated liver disease (i.e., ascites, esophageal or rectal varices, hepatic encephalopathy) or current evidence of active hepatitis (AST or ALT > 2.5x ULN).

Subject has evidence of liver impairment at screening (i.e., INR > 1.7, total bilirubin >2.0 mg/dL, albumin <3.5 g/dL).

Subject has inadequate venous access. Subject has a history of any hypersensitivity reaction to any component of FPV, APV, RTV, or to any drug chemically related to FPV, APV, or RTV.

Gender

Both

Ages

18 Years to 64 Years

Accepts Healthy Volunteers

Yes

Contacts ^ICMJE

Contact information is only displayed when the study is recruiting subjects

Location Countries ^ICMJE

United States

Administrative Information

NCT ID ^ICMJE

NCT00481182

Responsible Party

Study Director, GSK

Study ID Numbers ^ICMJE

102577

Study Sponsor ^ICMJE

GlaxoSmithKline

Collaborators ^ICMJE

Investigators ^ICMJE

Study Director:

GSK Clinical Trials, MD

GlaxoSmithKline

Information Provided By

GlaxoSmithKline

Verification Date

February 2009

^ICMJE Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP