Аннотация:ABSTRACT The anti- Toxoplasma activities of nine antiretroviral drugs were examined in vitro. Nucleoside analogs had no effect on parasite growth, whereas ritonavir and nelfinavir were inhibitory for Toxoplasma , with 50% inhibitory concentrations of 5.4 and 4.0 μg/ml, respectively. None of the antiviral drugs affected the anti- Toxoplasma activity of pyrimethamine or sulfadiazine.