31 patients with Taenia have been treated with mebendazole. With the schedules of 100 mg, bid, for 4 consecutive days, 200 mg, bid for 2 and 200 mg, bid for 4, the percentages of cure were respectively, 20,0%, 72,7% and 90,0%. No significant difference could be observed when patients with Taenia solium and Taenia saginata were treated with the most active schedule. The absence of side effects and the extensive anti-helminthic activity of mebendazole highly recommend its use inclusive as a new taenicide agent