ACTG 175: A Randomized, Double-Blind, Phase III Study of Indinavir Sulfate With Open-Label Zidovudine (AZT) and Lamivudine (3TC) in Subjects With HIV Infection With CD4 Cell Counts <= 200 Cells/mm3 and >= 6 Months of Prior AZT Experience

To determine the clinical efficacy of indinavir sulfate or placebo in combination with zidovudine ( AZT ) and lamivudine ( 3TC ) in AIDS patients. Protease inhibitors such as indinavir sulfate may be effective in patients with advanced HIV disease who have received prior AZT therapy. Since studies suggest that triple drug therapy may have an advantage over both monotherapy and two drug therapy, the combination of indinavir sulfate with AZT and 3TC should be evaluated.