A Randomized, Unblinded Trial of Zidovudine Versus ddC in the Treatment of Patients Status Post PCP Who Received Long-Term Zidovudine Therapy in Protocol ACTG 002

While treatment with AZT has been found to be effective in prolonging survival and reducing the numbers of opportunistic infections in patients with AIDS, during the second year of administration of AZT an acceleration in mortality has been observed. The reasons for this are not known at this time. The study of what may be an AZT-resistant strain of HIV may benefit patients who have been and are still receiving AZT or another drug used in treating HIV ddC. It is hoped that the comparison of the effectiveness of AZT and ddC will benefit in the treatment of these patients.

Following tests to evaluate their health, patients are chosen at random to receive either AZT or ddC. AZT is given by mouth at the patients' current dose. ddC is given by mouth every 8 hours. Treatment continues for up to 12 months. Patients are required to visit the clinic every 2 weeks up to week 12 and then once a month. Blood samples are taken to monitor the safety and effectiveness of treatment.