The effects of triclabendazole on the lung fluke, Paragonimus uterobilateralis in the experimental host Sigmodon hispidus.

The new veterinary drug triclabendazole (Fasinex) was tested for its anthelmintic activity against adult Paragonimus uterobilateralis in experimentally infected cotton rats, Sigmodon hispidus. After a single dose of 50, 100 or 150 mg/kg b.w. triclabendazole or after two doses of 5 or 10 mg/kg b.w. given at an interval of 24 hours, 56-61% of the flukes were dead at three to five weeks after treatment. Two doses of 50 or 75 mg/kg b.w. triclabendazole killed all flukes. The flukes, which were still alive three to five weeks after treatment, were significantly smaller than the un-treated controls. Histological sections from these flukes showed severely damaged tissues. It is assumed that these flukes would have died later.