Active clinical trials for "HIV Infections"

The purpose of this research study is to determine which of three different dose combinations of tipranavir and ritonavir, when taken with a standard approved anti-HIV drug therapy, is most effective and safe. Tipranavir is an investigational protease inhibitor which has been demonstrated to have in vitro activity against HIV-1.

This study will test the safety, side effects and antiviral activity of different doses of tenofovir DF in children and adolescents with human immunodeficiency virus (HIV) infection. Tenofovir DF belongs to a group of drugs called nucleotide analog reverse transcriptase inhibitors. These drugs prevent the virus from replicating (making more copies of itself). HIV becomes resistant to many drugs used to fight the virus and these drugs become ineffective. In laboratory tests, tenofovir DF has remained effective against HIV longer than other anti-HIV medicines, and when resistance does develop, the virus may still be sensitive to other drugs. HIV-infected children between the ages of 4 and 18 years who weigh at least 10 kg (22 pounds) may be eligible for this study. They must be able to receive antiretroviral therapy and have completed at least two previous antiretroviral courses of treatment without benefit. Upon entering the study, participants will have physical, eye and neuropsychiatric examinations, blood tests, including tests to determine what anti-HIV drugs the patient is resistant to, an echocardiogram (echo), electrocardiogram (EKG), chest X-ray, head CT scan, skin tests, and special tests to examine the bones. These physical exams and tests will be repeated throughout the study to determine changes in health. Participants will continue their current anti-HIV therapy for 2 weeks and then stop all medicines for a 1-week 'washout' period. After the washout period, patients will begin taking tenofovir DF. For the first 2 days on the drug, a small blood sample (1/2 teaspoon) will be collected 11 times over a 48-hour period through. A heparin lock (a tube kept in place in a vein) may be put in place to avoid multiple needle sticks. Blood samples will be collected for another 4 days to measure how well tenofovir DF alone works against HIV before other drugs are added to the treatment regimen. After these first 6 days, at least two other anti-HIV drugs will be added. They will be selected based on the results of the earlier blood tests for resistance and on the child's medication history. After 3 days of combination therapy, patients will continue therapy on an outpatient basis. They will be seen in the clinic every 4 weeks at the start of the study and then every 12 weeks for physical exams, lab tests and other procedures as needed. The study will last approximately 48 weeks. Patients who benefit from therapy may be able to continue to receive tenofovir DF from the drug company sponsor or as part of another study, or the protocol for this study may be amended to lengthen the treatment period.

To investigate the safety of polyethylene glycolated interleukin-2 (PEG IL-2) given subcutaneously in conjunction with antiviral treatment and to explore the effects of treatment on surrogate markers of efficacy and incidence of opportunistic infection and other clinical markers of HIV disease.

To define the pharmacokinetic characteristics of Nystatin LF IV (intravenous) in human subjects with AIDS-related complex (ARC) after administration of a single IV dose at each of 4 dose levels.

To evaluate the virologic effect of combined administration of zidovudine and ddI or ddC. To evaluate the immunologic effects of zidovudine and ddI or ddC. To evaluate combined administration of zidovudine and ddI or ddC for clinical efficacy. To evaluate the safety and the tolerance of the coadministration of zidovudine and ddI or ddC.

To evaluate the pharmacokinetics, safety, and tolerance of delavirdine mesylate ( U-90152 ) after multiple doses given orally to asymptomatic HIV-1 positive patients who are maintained on a stable dose of zidovudine ( AZT ). To investigate the optimum dose regimen of U-90152 that gives average trough concentrations > 1 micromolar in combination with standard AZT therapy, and to examine drug interactions between the two drugs. To establish the MTD of U-90152 in HIV-1 positive patients on stable AZT therapy. To investigate comparative pharmacokinetics between HIV-1 positive men and women.

To evaluate the clinical toxicity, safety, and potential anti-HIV activity of intravenous nystatin in patients with HIV infection who have completed protocol FDA 103C. To evaluate the safety and potential antiviral activity of intravenous nystatin and oral didanosine (ddI) administered in an alternating regimen in this patient population.

To compare, in zidovudine (AZT)-naive patients, the safety, tolerance, and efficacy of saquinavir mesylate (Ro 31-8959) alone versus AZT alone versus AZT in combination with Ro 31-8959, zalcitabine (ddC), or both. To compare various disease markers among the different regimens.

To study the safety, tolerance, single and multiple dose pharmacokinetics, and anti-HIV activity of bis-POM PMEA ( adefovir dipivoxil ) versus placebo when administered orally on a daily basis for 2 weeks to HIV-infected patients.

To determine the effect of HIV-1 immunogen (Remune) on AIDS-free survival, defined as the time prior to development of an AIDS-defining condition or death.