A Double-Blind, Randomized, Dose Response Study of Three Doses of Delavirdine Mesylate (U-90152S) in Combination With Zidovudine (ZDV) Versus ZDV Alone in HIV-1 Infected Individuals With CD4 Counts of 200-500mm3

Inclusion Criteria Patients must have: HIV-1 seropositivity. CD4 count 200-500 cells/mm3. No active or acute (onset within the past month) opportunistic infections such as active cryptococcosis, pneumocystis carinii, herpes zoster, histoplasmosis, or cytomegalovirus (CMV). Consent of parent or guardian if less than 18 years of age. Understanding of potential risk to fetus related to study participation. Acceptable medical history, physical exam, EKG, and chest x-ray during screening. NOTE: Patients with cutaneous Kaposi's sarcoma requiring no systemic therapy are permitted. PER AMENDMENT 3/7/96: ZDV therapy for 0-6 months prior to study entry. (Part II) Prior Medication: Allowed: Prior AZT (no more than 6 months total). Exclusion Criteria Co-existing Condition: Patients with the following symptoms or conditions are excluded: Active tuberculosis that is sensitive to rifampin. Inability to swallow numerous tablets. Clinically significant active or acute medical problems, including progressive multifocal leukoencephalopathy, lymphoma, or malignancy requiring systemic therapy. Clinically significant hypersensitivity to piperazine-type drugs (e.g., Antepar and Stelazine). Grade 2 or worse baseline organ function. NOTE: Hemophiliacs with grade 2 bilirubin, alkaline phosphatase, SGOT, or SGPT will be considered if these values have been stable over the past year. NOTE: Patients with suspected Gilbert's syndrome will be considered if bilirubin is grade 2 or better. Patients with the following prior conditions are excluded: History of pancreatitis within the past 2 years. History of clinically significant nervous system or muscle disease, seizure disorder, AIDS dementia, or psychiatric disorder that would preclude study compliance. History of grade 2 or worse peripheral neuropathy. Intolerance to AZT in previously treated patients. Prior Medication: Excluded: More than 6 months total of prior AZT. Any prior ddC, d4T, 3TC, or ddI. Prior non-nucleoside reverse transcriptase inhibitors, including L-drugs, nevirapine, TIBO, HEPT, delavirdine, atevirdine, and alpha-APA. Other investigational antiretroviral medications (including foscarnet) or immunomodulators (including all interferons) within 21 days prior to initial study drug dose. Prior prophylactic or therapeutic HIV-1 gp120 or 160 vaccines. Rifampin, rifabutin, astemizole, loratadine, or terfenadine within 21 days prior to initial study drug dose. Any unapproved investigational medication for any indication within 21 days prior to initial study drug dose. Any enzyme-inducing drugs known to affect cytochrome P450 3A, (e.g., ketoconazole, fluconazole, isoniazid, itraconazole, etc.) within 21 days prior to initial study drug dose. Active substance abuse.