Trial NCT00014014

Property	Value
linkedct:brief_title	Zidovudine and Lamivudine Given Once Versus Twice Daily
linkedct:collaborator_agency	<http://static.linkedct.org/resource/collabagency/2560>
linkedct:condition	<http://static.linkedct.org/resource/condition/5486>
linkedct:criteria	Inclusion Criteria Patients may be eligible for this study if they: - Are 12 through 24 years of age. - Are HIV-positive. - Weigh more than 40 kg. - Have a CD4 cell count above 250 cells/microL. - Have taken at least 4 weeks of 3 or more anti-HIV medications, which must include ZDV and 3TC (as individual drugs or Combivir) and either a protease inhibitor or nonnucleoside reverse transcriptase inhibitor, and do not plan to change these medications during the study period. - Have consent of a parent or guardian if under 18 years of age. - Have a negative pregnancy test, if female and able to have children. - Agree to use 2 effective methods of birth control (birth control pills plus a barrier method or 2 barrier methods) while taking study medication, if female and able to have children. Exclusion Criteria Patients will not be eligible for this study if they: - Have an opportunistic (AIDS-related) infection that requires treatment at study entry. - Are receiving anti-cancer medications for cancer. - Are taking certain anti-HIV medications (nucleoside or nucleotide reverse transcriptase inhibitors, other than ZDV and 3TC), or hydroxyurea. - Are pregnant or breast-feeding. - Have diseases (other than HIV infection) or other conditions that, in the investigator's opinion, would interfere with the study.
linkedct:description	Initial dosing regimens of ZDV were based on the plasma half-life of the drug. However, recent studies of the intracellular metabolism of ZDV have demonstrated that the active anabolite, ZDV-TP, is present within the cell for an extended period of time relative to the drug in the plasma. This suggests that antiviral activity may be present for a sufficient time frame with less-frequent dosing of the drug. Careful comparison of the rate and extent of intracellular phosphorylated ZDV metabolites as a function of schedule will determine whether less-frequent dosing has a sound pharmacological basis. Also, the intracellular metabolism of 3TC is via different enzymes than that of ZDV and there are quantitative differences in the amount of triphosphate formed from both drugs. This study will provide information about intracellular metabolites when both ZDV and 3TC are concurrently administered. This is a study of 2 schedules of Combivir therapy. At study entry or Part I, all patients take Combivir twice daily for the 7-day adherence assessment. Patients who have demonstrated 70 percent or greater adherence [AS PER AMENDMENT 7/20/01: 70 percent compliance with the study regimen for Combivir. This corresponds to taking at least 10 of the prescribed 14 Combivir tablets during the 7 days prior to an adherence assessment, including all scheduled doses in the 24-hour period prior to that assessment.], and have taken all scheduled Combivir doses in the previous 24 hours, have pharmacokinetic samples obtained and are randomized to Group A or Group B in Part II. Group A patients take 2 Combivir tablets once daily; Group B patients take 1 Combivir tablet twice daily. After patients have completed the targeted duration of Part II (7 days for Group A and 7-14 days for Group B), they are assessed for adherence. Patients who have demonstrated 70 percent or greater adherence, and have taken all scheduled Combivir doses in the previous 24 hours, have pharmacokinetic samples obtained and then change to the alternate dosing schedule. Group A patients take 1 Combivir tablet twice daily; Group B patients take 2 Combivir tablets once daily. After patients have completed the targeted duration of Part III (7-14 days for Group A and 7 days for Group B), they are assessed for adherence. All patients who meet the adherence criteria have pharmacokinetic samples obtained. After completion of Part III pharmacokinetic studies, patients have completed the study. (Note: Combivir will not be provided in this study.)
linkedct:download_date	Information obtained from ClinicalTrials.gov on December 30, 2009
linkedct:eligibility_gender	Both
linkedct:eligibility_healthy_volunteers	No
linkedct:eligibility_maximum_age	24 Years
linkedct:eligibility_minimum_age	12 Years
linkedct:enrollment	20 (xsd:int)
linkedct:firstreceived_date	April 7, 2001
linkedct:id	NCT00014014
rdfs:label	Trial NCT00014014
linkedct:lastchanged_date	July 30, 2008
linkedct:lead_sponsor_agency	National Institute of Allergy and Infectious Diseases (NIAID)
linkedct:location	<http://static.linkedct.org/resource/location/105306>
linkedct:location	<http://static.linkedct.org/resource/location/147780>
linkedct:location	<http://static.linkedct.org/resource/location/151107>
linkedct:location	<http://static.linkedct.org/resource/location/151248>
linkedct:location	<http://static.linkedct.org/resource/location/153748>
linkedct:location	<http://static.linkedct.org/resource/location/155960>
linkedct:location	<http://static.linkedct.org/resource/location/156523>
linkedct:location	<http://static.linkedct.org/resource/location/160320>
linkedct:location	<http://static.linkedct.org/resource/location/160783>
linkedct:location	<http://static.linkedct.org/resource/location/170081>
linkedct:location	<http://static.linkedct.org/resource/location/171716>
linkedct:location	<http://static.linkedct.org/resource/location/179912>
linkedct:location	<http://static.linkedct.org/resource/location/180439>
linkedct:location	<http://static.linkedct.org/resource/location/192365>
linkedct:location	<http://static.linkedct.org/resource/location/192654>
linkedct:location	<http://static.linkedct.org/resource/location/192981>
linkedct:location	<http://static.linkedct.org/resource/location/197412>
linkedct:location	<http://static.linkedct.org/resource/location/202102>
linkedct:location	<http://static.linkedct.org/resource/location/210066>
linkedct:location	<http://static.linkedct.org/resource/location/213413>
linkedct:nct_id	NCT00014014
linkedct:number_of_arms	0 (xsd:int)
linkedct:number_of_groups	0 (xsd:int)
linkedct:official_title	A Phase I Pharmacokinetic Study of Once Versus Twice Daily Dosing With Zidovudine and Lamivudine
linkedct:org_study_id	ACTG P1012
linkedct:overall_official	<http://static.linkedct.org/resource/overall_official/45295>
linkedct:overall_status	Active, not recruiting
linkedct:oversight	<http://static.linkedct.org/resource/oversight/2918>
foaf:page	<http://clinicaltrials.gov/show/NCT00014014>
linkedct:phase	Phase 1
linkedct:secondary_id	PACTG P1012
linkedct:source	National Institute of Allergy and Infectious Diseases (NIAID)
linkedct:study_design	Treatment, Crossover Assignment, Pharmacokinetics Study
linkedct:study_type	Interventional
linkedct:summary	The purpose of this study is to see if the full daily dose of Combivir (zidovudine [ZDV]/lamivudine [3TC]) taken once a day is as effective as the usual recommended twice-a-day dose. Studies have shown that the antiviral activity of ZDV can continue in the body even after there does not appear to be any ZDV left in the blood. This occurs because the body breaks down the drug into substances that remain active against HIV. The body also breaks down 3TC, a drug that is combined with ZDV in the Combivir product, in a similar way. Since antiviral activity may continue after Combivir is removed from the body, it may not be necessary to take the drug as often as once thought. This study carefully measures levels of the active substances in order to find out whether the same amount of antiviral activity occurs with less-frequent dosing.
rdf:type	linkedct:trials
linkedct:verification_date	August 2004

LinkedCT.org