Active clinical trials for "HIV Infections"

Tipranavir (TPV) plus ritonavir (RTV) is indicated for use as part of an antiretroviral treatment regimen for resistant HIV-1 infection in adult patients. Since significant cholesterol and triglyceride elevations are commonly reported during TPV/RTV treatment, effective treatment strategies are critical to prevent long-term cardiovascular events. Rosuvastatin, a potent 3-hydroxy-3-methylglutaryl-coenzyme (HMG-CoA) reductase inhibitor, is unlikely to interact with TPV/RTV since it is not extensively metabolized, however, a formal drug interaction study is needed before this combination can be recommended. This study will examine the pharmacokinetic interactions between tipranavir/ritonavir (TPV/RTV [TPV/r] 500 mg/200 mg twice daily [B.I.D]) and single dose rosuvastatin when the two are co-administered to healthy adult volunteers. The investigators hypothesize that if tipranavir 500 mg is co-administered with low-dose ritonavir 200 mg and rosuvastatin (10 mg) no significant clinical interaction will occur.

The study aims to ascertain whether the sole replacement of tenofovir with abacavir once a day improves the immunological response obtained with tenofovir + ddI or whether it is better to perform a double replacement of tenofovir and ddI with abacavir + lamivudine (joint formulation) in a single daily dose to achieve these objectives.

This study will investigate the safety and efficacy of MK-0518 versus efavirenz, in combination with TRUVADA, as a therapy for Human Immunodeficiency Virus (HIV)-infected patients not previously treated.

The study analyzes the virological response in plasma and non-plasma compartments, as well as the degree and kinetics of immune reconstitution in 70 treatment-naive patients with CD4 < 100/mm3, when they receive treatment with two nucleoside analogs (NRTI) plus one protease inhibitor (PI) compared with 2 NRTI plus one non-nucleoside (NNRTI).

Saquinavir and Atazanavir are drugs used in combination therapy to treat HIV disease. Saquinavir is currently available in a 200 milligram capsule. Most individuals currently on saquinavir require to take 5 tablets twice a day. In an attempt to reduce this number of pills, a new capsule has been developed containing 500 milligrams of saquinavir. This study will assess: i) blood drug levels in individuals taking both saquinavir formulations, ii) blood drug levels in individuals taking both saquinavir formulations when given with atazanavir, iii) 48 weeks of follow up for individuals receiving the new saquinavir formulation with atazanavir as HIV therapy.

Vicriviroc (vye-kri-VYE-rock) is an investigational drug that belongs to a new class of drugs, called C-C chemokine receptor type 5 (CCR5) receptor blockers. This group of drugs blocks one of the ways human immunodeficiency virus (HIV) enters T-cells (the cells that fight infection). The purpose of this 48-week study is to evaluate 2 dose levels of vicriviroc in participants with HIV who have not responded adequately to standard HIV treatments. This study was designed to evaluate the safety and efficacy of doses of vicriviroc, when taken in combination with other HIV drugs, in terms of ability to decrease the level of HIV (viral load) in the blood. The primary objective of the study was to evaluate antiviral efficacy of two doses of Vicriviroc maleate compared to placebo in combination with a protease inhibitor (PI)-containing optimized antiretroviral therapy (ART) regimen in CCR5-tropic HIV infected individuals failing a standard ART regimen.

The purpose of this study is to obtain a preliminary assessment of the antiviral activity and tolerability of simplified Kaletra dual agent therapy as initial treatment for HIV infection, relative to a Kaletra three drug standard of care reference arm.

Combination of PEG interferon and ribavirin is the standard treatment of chronic hepatitis C. Efficacy of this treatment has never been evaluated in HCV-HIV infected patients, who have previously been treated with a first line anti-HCV treatment. The purpose of the study is to evaluate the combination PEG interferon alfa2a-ribavirin in HIV-infected patients with chronic hepatitis C pretreated with interferon alone or interferon combined with ribavirin. The patients receive a dose of 180 µg of PEGASYS once a week and 800 to 1200 mg/day of ribavirin (according to weight) for 48 weeks. Primary outcome of the study is a sustained virological response, defined as an undetectable HCV RNA level 24 weeks after the end of anti-HCV treatment.

This is a proof of concept (POC) single arm study of GW640385, a protease inhibitor, in combination with RTV and 2 or more nucleoside reverse transcriptase inhibitors (NRTI) backbone. This study has a 48 week duration and is open to both treatment naive and experienced patients who are HIV positive. There are 3 intensive pharmacokinetic (PK) visits.

Once-daily nucleotide/nucleoside reverse transcriptase inhibitor (NtRTI/NRTI) combinations form the backbone of many regimens. Although efficacy data exists between tenofovir and the pyrimidine analogues (i.e. lamivudine and emtricitabine), recent clinical data suggests a potential interaction between tenofovir and purine analogs (i.e. abacavir and didanosine). Specific Aim 1: To evaluate the impact of an acyclic nucleoside phosphonate, tenofovir (TDF), on the intracellular metabolism of a purine nucleoside analog, abacavir (ABC), as a determinant of the antiviral potency of this nucleotide/nucleoside reverse transcriptase inhibitor (NtRTI/NRTI) combination. Hypothesis #1: ABC and TDF dosed together will have reduced antiviral activity, as measured by early plasma HIV RNA decay kinetics, than the drugs given alone. Hypothesis #2: ABC dosed with TDF will have reduced intracellular concentrations, as measured by the ratio of carbovir triphosphate (active metabolite of ABC) to deoxyguanosine triphosphate (endogenous nucleotide), compared to ABC given alone.