The authors treated 98 individuals, 73 with fenbendazoie and 25 with mebendazoie. The control of cure was by four stool examinations in a month. The tolerance of both drugs was excellent. Fenbendazoie cured 17 (100%) with A. lumbricoides, 32 (68%) with hookworm and 50 (79.3%) with T.trichuris. Comparatively mebendazoie cured 10 (91%) patients with A. lumbricoides, 13 (92.8%) with hookworm and 20 (100%) with T.trichuris. Mebendazoie is preferable to fenbendazoie.