Study Comparing Racivir and Lamivudine in Treatment-Experienced HIV Subjects

The study is divided into four periods: a 'Screening' period which can last up to 30 days in duration, a 'Blinded Treatment' period which can last up to 4 weeks in duration, a 'Follow-up' period which is 28 days in duration, and an 'Open-label Treatment' period that some subjects will be given the option to participate in and which can last up to 20 weeks. If eligible subjects decide to participate in this research study, they will be randomized, which is like picking chances from a hat, to get RCV (Racivir®) alone, 3TC (lamivudine, Epivir®) alone, or RCV and 3TC (lamivudine, Epivir®) in combination. This is a "double-blind study". This means that neither the subject nor the study doctor and study staff will know if subjects are receiving RCV (Racivir®), 3TC (lamivudine, Epivir®), or RCV (Racivir®) and 3TC (lamivudine, Epivir®). This needs to be done to make sure the researchers obtain the information needed to see if RCV (Racivir®) is safe and as effective as 3TC (lamivudine, Epivir®). In case of an emergency, the study doctor will be able to find out immediately what study drug subjects were receiving. With this exception, by signing the consent form subjects agree that they will not be able to find out what medications they are taking, because this is a "double-blind" study, it is necessary to use placebo tablets. A placebo is a tablet that does not contain any active drug, but is made to look just like the study drug. Subjects will be given three bottles of study medication. They will be asked to take one tablet from each bottle once a day by mouth, in addition to their current HAART drugs, not including 3TC. The 3TC in their current HAART regimen must be discontinued prior to beginning the study medication. It is important that subjects follow all directions when taking the study drugs. After completing the first 14 days of the blinded treatment period, subjects will be given the option to continue on their current randomized therapy, including their current study medication, for an additional 1-2 weeks. On Day 15, a blood sample will be collected to determine the amount of HIV virus in the blood. Once the results from that blood sample are available, subjects will be told the amount of how much HIV virus changed in the blood during the first 14 days of treatment. Subjects will also be told if they were receiving RCV (Racivir®) alone, 3TC (lamivudine, Epivir®) alone, or a combination of RCV (Racivir®) and 3TC (lamivudine, Epivir®). If subjects were receiving RCV (Racivir®), to continue in the open-label treatment period, the amount of virus in the blood must drop by at least 2/3 during the first 14 days of the blinded treatment period. For example, if subjects enter the study with 10,000 copies of the HIV virus per milliliter (ml) of blood, then to continue in the open-label period, the virus level must drop to 3,162 copies or less, per ml of blood. Open-label means that participating subjects and the study doctor or study staff will know what treatment subjects were receiving. If the virus drops by at least 2/3, subjects will be given the option to enter an open-label treatment period. During the open-label period, subjects will receive 600 mg RCV (Racivir®) once daily along with their regular HAART medications. Before entering the open-label period, the study doctor may decide to change the subject's other ARV medications. Participating subjects will be financially responsible for all medications, other than RCV (Racivir®), that the study doctor may prescribe. Once treatment is "unblinded", subjects may learn that they were not receiving any RCV (Racivir®) during the blinded treatment period. Subjects may voluntarily decide to add 600 mg RCV (Racivir®) once daily to the other HAART medications. The study doctor may decide to change the subject's HAART medications at this time. After 2 weeks of RCV (Racivir®) based treatment, subjects will be asked to return to the study doctor's office to have blood drawn to determine the amount of HIV virus in the blood. Subjects may continue on RCV (Racivir®) for up to an additional 2 weeks until the results from the blood test are available. If the viral load does not decline by at least 2/3, subjects will be withdrawn from the open-label portion of the study. Subjects will be asked to return to the study doctor's office for a final follow-up visit approximately 28 days after the last dose of RCV (Racivir®). The open-label treatment period will last no longer than 20 weeks. During this study, subjects can receive up to 24 weeks of RCV (Racivir®) therapy. After subjects receive the last dose of study medication, they will enter the follow-up period for 28 days. If a participating subject or the study doctor decides to withdraw from the study early, subjects will need to return to the study doctor's office to have a follow-up visit approximately 28 days after the last dose of RCV (Racivir®).