Inclusion Criteria

Concurrent Medication:

Allowed:

• PCP prophylaxis (trimethoprim-sulfamethoxazole, dapsone, or aerosolized pentamidine), at the discretion of the investigator.
• Antifungal prophylaxis with oral fluconazole or ketoconazole.
• Antiviral prophylaxis for herpes simplex virus with <= 1000 mg/day oral acyclovir.
• Dilantin for prevention and treatment of seizures.

Patients must have:

• Asymptomatic HIV-1 infection, with positive serum antibody to HIV-1 as determined by ELISA or Western blot.
• CD4 count 200-500 cells/mm3 within 4-28 days prior to study entry.
• No conditions indicative of AIDS.
• None of the constitutional symptoms that are specifically excluded.
• Prior AZT for 3-24 months (amended 04/04/94) immediately prior to study entry (Part I) OR no prior AZT (Part II).
• Consent of parent or guardian if less than 18 years of age.

NOTE:

• Co-enrollment in a protocol involving another investigational drug or biologic is not permitted.

Exclusion Criteria

Co-existing Condition:

Patients with the following symptoms or conditions are excluded:

• Malignancy other than limited cutaneous basal cell carcinoma.
• Psychiatric condition sufficient to impair compliance with protocol requirements.

Concurrent Medication:

Excluded:

• Investigational drugs other than study drugs.
• Systemic glucocorticoids and steroid hormones.
• Dicumarol, warfarin, and other anticoagulant medications.
• Cimetidine.
• Tolbutamide.
• Doxycycline.
• Chloramphenicol.
• Phenobarbital and other barbiturates.
• Foscarnet.
• Erythromycin.
• Amoxicillin-clavulanate (Augmentin).
• Ticarcillin clavulanate (Timentin).
• Biologic response modifiers (alpha interferon, IL-2, immune modulators).

Patients with the following condition are excluded:

History of other clinically important disease (i.e., one that precludes participation in the study).

Prior Medication:

Excluded:

• Antiretroviral medications other than AZT.

Excluded within 4 weeks prior to study entry:

• Immunosuppressive or cytotoxic drugs or other experimental drugs.
• Systemic glucocorticoids and steroid hormones.
• Dicumarol, warfarin, and other anticoagulant medications.
• Cimetidine.
• Tolbutamide.
• Doxycycline.
• Chloramphenicol.
• Phenobarbital and other barbiturates.
• Foscarnet.
• Erythromycin.
• Amoxicillin-clavulanate (Augmentin).
• Ticarcillin clavulanate (Timentin).
• Biologic response modifiers (alpha interferon, IL-2, immune modulators).

Required (for patients in Part I):

• Prior AZT at 500-600 mg daily for at least 3 months but not more than 24 months immediately prior to study entry. Chronic use of alcohol or drugs sufficient to impair compliance with protocol requirements.