Persons who are infected with HIV and have symptoms (fever, fatigue, weight loss) of AIDS are eligible for the study. They will be given AZT orally every 4 hours or APAP orally every 8 hours alone or in combination for 4 days while at home. On the 4th day, participants will be admitted to a clinical research center for studies to determine how they are tolerating the medicine. On the 5th day, any scheduled 8 am doses of AZT will be given intravenously, while the scheduled doses of APAP will still be given orally. Repeated blood samples will be taken over the next 12 hours and urine will be collected for 24 hours. The process will be repeated at weekly intervals for 3 weeks, so that each patient receives AZT alone, APAP alone, and the combination of AZT and APAP.