A Study of 141W94 Used Alone or in Combination With Zidovudine Plus 3TC in HIV-Infected Patients

Inclusion Criteria Concurrent Medication: Allowed: Chemoprophylaxis for Pneumocystis carinii pneumonia is required for all patients who have a CD4 cell count <= 200 cells/mm3. Topical and/or oral antifungal agents, except for those listed in excluded medications. Treatment, maintenance or chemoprophylaxis with approved agents for opportunistic infections as clinically indicated, unless listed in excluded medications. All antibiotics as clinically indicated. Systemic corticosteroid use for <= 21 days for acute problems is permitted as medically indicated; chronic systemic corticosteroid use is not permitted. Recombinant erythropoietin and granulocyte colony-stimulating factor as medically indicated. Regularly prescribed medications such as: antipyretics, analgesics, allergy medications, antidepressants, sleep medications, oral contraceptives (a barrier method is also required for this study), megestrol acetate, testosterone or any other medications, as medically indicated. Alternative therapies such as vitamins, acupuncture and visualization techniques are permitted (excluding herbal medications). NOTE: Patients should report the use of these therapies; alternative therapies will be recorded. Patients must have: HIV-1 infection as documented by ELISA and confirmed. >= 5,000 HIV-1 RNA copies/ml (within 30 days prior to study entry). CD4 cell count >= 50 cells/mm3 within 60 days prior to study entry. Signed, informed consent for patients < 18 years of age. Prior Medication: Required: Patients must be on a stable antiretroviral regimen for 30 days prior to study screening and remain on the same regimen until entry. Exclusion Criteria Co-existing Condition: Patients with the following symptoms or conditions are excluded: Any active infection requiring acute treatment within 14 days prior to entry. A malignancy that requires systemic therapy other than minimal Kaposi's sarcoma. NOTE: Patients with minimal Kaposi's sarcoma, defined as <= 5 cutaneous lesions and no visceral disease or tumor-associated edema, will be allowed to enroll as long as they do not require systemic therapy for Kaposi's sarcoma. Patients with the following prior symptoms and conditions are excluded: Inability to tolerate ZDV 500-600 mg daily if ZDV was administered previously. Intolerance to ZDV is defined as any grade toxicity that resulted in a dose reduction or termination of ZDV. Prior Medication: Excluded: Any 3TC therapy prior to entry. Any HIV-1 protease inhibitor therapy prior to study entry (e.g., saquinavir, ritonavir, indinavir, nelfinavir, 141W94). Any immunomodulator therapy within 30 days prior to entry. Active immunization within 30 days prior to entry. Any antiretroviral therapy change within 30 days prior to study screening. 1. Concurrent use of non-protocol specified antiretroviral agents; either investigational or licensed. Immunomodulators that affect immunologic or virologic indices such as systemic corticosteroids, thalidomide, or cytokines. Concomitant use of rifabutin and/or rifampin. Investigational drugs other than 141W94/VX-478. Systemic cytotoxic chemotherapy. Oral astemizole (Hismanal), carbamazepine (Tegretol), dexamethasone (Decadron), ketoconazole (Nizoral), itraconazole (Sporanox), phenobarbital, phenytoin (Dilantin), terfenadine (Seldane), cisapride (Propulsid), triazolam (Halcion) and midazolam (Versed). Herbal medications.