Diloxanide is hydrolyzed in the gastrointestinal tract from its prodrug Diloxanide furoate.Diloxanide furoate (oral administraion; 75-200 mg/kg; 3 days; once daily) is effective at different dose of dayin weanling rats. At 200 mg/kg, 100% of the treated rats are cured and no amoebic lesions are observed in the caecum. Besides, 85%,77%, and 44.4% of the treated rats are cured at the dose 150 mg/kg, 100 mg/kg, and 75 mg/kg, respectively. The ED50 value is 77.9 mg/kg for this agent in rats.