Inclusion Criteria

Concurrent Medication:

Allowed:

Erythropoietin, G-CSF and GM-CSF.

Patients must have:

• CD4+ cell count < 100 cells/mm3.
• HIV-1 RNA > 30,000 copies/ml.
• Signed, informed consent from parent or legal guardian for patient under 18 years of age.

Exclusion Criteria

Co-existing Condition:

Patients with the following conditions or symptoms are excluded:

• Renal failure requiring dialysis.
• Hepatic failure evident by grade 3/4 hyperbilirubinemia and AST 5 times the upper limit of normal.
• Documented hypersensitivity to 1592U89.
• Serious medical conditions, such as diabetes, congestive heart failure, cardiomyopathy, or other cardiac dysfunction, that would compromise the safety of the patient.
• Participation in or ability to participate in an enrolling study of 1592U89.

Required:

At least 2 nucleoside reverse transcriptase inhibitors (NRTI) and one protease inhibitor (or intolerance to one protease inhibitor and one NRTI due to trying at least 2 different regimens with at least one protease inhibitor).

Alcohol or illicit drug use that may interfere with the patient's compliance.