dWhen administered orally at 50 mg/kg live weight to sheep for 14 days mebendazole killed almost allTaenia hydatigenadandT. ovisdcysts and significantly retarded the growth ofEchinococcus granulosuscysts. A single subcutaneous injection of mebendazole at 50 mg/kg was ineffective and was only partially effective when injected at this rate into the peritoneal cavity. The lack of effect was attributed to the slow solubilization of the injected depot.