Clorsulon is used in the treatment of Fasciola hepatica infections in calves and sheep. Target: Antiparasitic Clorsulon is a competitive inhibitor of both 3-phosphoglycorate and ATP and had a Ki of 0.29 mM, inhibits glucose utilization and acetate and propionate formation by mature Fasciola hepatica in vitro. [1] Clorsulon (a single dose of 15 mg/kg) is effective in removing over 90% of immature Fasciola hepatica from sheep (6 weeks after infection) and calves (8 weeks after infection). A 2.5 mg/kg dose removed over 90% of mature (16 weeks old) liver fluke from sheep [1]. Clorsulon causes severe disruption to the tegument and gut of Fasciola hepatica after in vivo incubation [2].

• [1]. Mrozik, H., et al., 4-amino-6-(trichloroethenyl)-1,3-benzenedisulfonamide, a new, potent fasciolicide. J Med Chem, 1977. 20(9): p. 1225-7.

  [2]. Meaney, M., et al., Transmission electron microscope study of the ultrastructural changes induced in the tegument and gut of Fasciola hepatica following in vivo drug treatment with clorsulon. Parasitol Res, 2004. 92(3): p. 232-41.