It is reported the case of a 12-year-old white school boy with diagnosis of degree III hemophilia A since he was 2 months old that had received innumerable transfusions of cryoprecipitate and several of blood. In 1999, he was diagnosed hepatitis C and, at the end of 2000, HIV infection. There was a high possibility of having acquired them both by the blood and hemoderivative transfusions received. As very low figures of TCD4 lymphocytes (4%) with 54 cells/mm3 were corroborated on conducting immunological studies, it was classified as group B-3 AIDS, according to the classification established by the CDC of Atlanta, in 1994. He was indicated antiretroviral treatment with tritherapy (d4T, 3TC and Nelfinavir). This case was reported to call the attention of doctors at the time of indicating treatment with antivirals or protease-inhibitors to fight AIDS in pediatric cases with diagnosis of hemophilia, since some of them may cause spontaneous bleeding episodes.