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To assess the in vivo short-term antiretroviral effect of hydroxyurea in human immunodeficiency virus (HIV)-infected persons chronically treated with didanosine (ddI), 26 patients with CD4 cell counts between 100 and 350 were enrolled in a 12-week, open-label pilot study and randomly assigned to receive 500 or 1000 mg/day hydroxyurea. Clinical status, laboratory toxicities, CD4 lymphocyte count, and HIV RNA plasma virus load were assessed weekly. Median declines from baseline of 0.02 and 0.63 log10 HIV-1 RNA copies/mL of plasma were observed for the 500- and 1000-mg/day groups, respectively (P = .02). CD4 cell counts did not change significantly with the addition of hydroxyurea; however, a small but statistically significant decrease in counts was observed during the washout phase. Both doses of hydroxyurea were well-tolerated. These results demonstrate a substantial decrease in plasma virus load when 1000 mg of hydroxyurea is administered over 1 month as adjunctive therapy to ddI among HIV-infected persons with 100-350 CD4 cells/mm3.

the journal of infectious diseases (online. university of chicago press)/the journal of infectious diseases

A Pilot Study of Hydroxyurea among Patients with Advanced Human Immunodeficiency Virus (HIV) Disease Receiving Chronic Didanosine Therapy: Canadian HIV Trials Network Protocol 080