25 cases of Hymenolepis nana infection in children were treated by a synthetic acridine derivative “Acranil.” The night before the administration of Acranil, the children were each given 0.1–0.2 gm. Calomel as aperient. The following morning Acranil was given on an empty stomach in 0.1–0.5 gram doses according to age. Three hours later a saline purge was administered. Treatment with Acranil was continued in smaller doses for 3 more days without any further purgation. 23 out of 25 children treated by this method remained free of worms for 14 days.