The Safety and Effectiveness of 524W91

Inclusion Criteria Patients must have: * Documented HIV infection. * CD4 count \>= 200 cells/mm3. * No active opportunistic infection. Exclusion Criteria Co-existing Condition: Patients with the following symptoms or conditions are excluded: * Malignancy or other condition that would confound study assessment or interfere with ability to complete the study. * Malabsorption syndrome or other gastrointestinal dysfunction that might interfere with gastrointestinal absorption. Concurrent Medication: Excluded on the day of each dose: * Antiretrovirals. * Any prescription or over-the-counter medication. * Alcoholic beverages. * Coffee, tea, and other xanthine-containing beverages and foods. Patients with the following prior conditions are excluded: History of hepatitis, pancreatitis, or cardiomyopathy within the past 5 years. Prior Medication: Excluded: * Antiretrovirals within 24 hours prior to each dose. * Any prescription or over-the-counter medications within 48 hours prior to each dose. * Alcoholic beverages within 48 hours prior to each dose. Current alcohol or illicit drug use that may affect patient compliance.