Inclusion Criteria

Concurrent Medication:

Allowed:

Primary and secondary prophylaxis for opportunistic infection if stable and initiated at least 3 months prior to study drug administration.

Patients must have:

• HIV-positive status.
• One HIV RNA count > 10,000 copies/ml within 30 days prior to entry, with a second count at least 3-fold above or below the first value.

Exclusion Criteria

Co-existing Condition:

Patients with the following conditions or symptoms are excluded:

• Active medical problems including chronic diarrhea and active opportunistic infections such as cryptococcosis, Pneumocystis carinii, histoplasmosis, etc..
• Malignancy for which systemic therapy or radiation therapy is expected to be required during the study.
• Any other disease or condition that would place a patient at undue risk or confound the results of the study.

Concurrent Medication:

Excluded:

Systemic therapy for malignancy.

Prior Medication:

Excluded:

• Zidovudine or any other nucleoside reverse transcriptase inhibitor.
• Immunomodulators within one month prior to study drug administration.
• Investigational drugs within 30 days prior to study drug administration.
• Systemic cytotoxic chemotherapy within 3 months prior to study drug administration.

Prior Treatment:

Excluded:

• Extended-field radiation therapy within 3 months prior to study drug administration.
• Blood transfusion within 2 weeks prior to study drug administration.