Exclusion Criteria: - Patients having a history of any important blood disease - having any clinically significant disease or malfunction of the lungs, heart, hormones, neurological, gastrointestinal, reproductive or urinary systems, which is not caused by the AIDS infection - having dementia due to AIDS, a history of seizures, uncontrolled high blood pressure, or an iron deficiency - androgen therapy within 2 months of study entry - having anemia caused by other conditions than AIDS or AZT therapy (for example, certain vitamin deficiencies or bleeding from the gastrointestinal tract) - having a sudden onset of infections, or a history of cell damage due to chemotherapy within 1 month before study entry.