In this double-blind trial conducted on Pemba Island , Tanzania , we randomly assigned children , 6 to 14 years of age , to receive one of four treatments : oxantel pamoate at a dose of 20 mg per kilogram of body weight , plus 400 mg of albendazole , administered on consecutive days ; oxantel pamoate at a single dose of 20 mg per kilogram ; albendazole at a single dose of 400 mg ; or mebendazole at a single dose of 500 mg .