This invention relates to the preparation of veterinary anthelmintic formulations including triclabendazole in solution, particularly for the treatment of parasitic infections such as fasciolisis, and particularly for administration to an animal in the form of a pour-on. The solutions include triclabendazole dissolved in a solvent system including at least one solvent selected from 2-pyrrolidone and liquid polyethylene glycol. Additional solvents may also be included. The present invention is advantageous as triclabendazole can be included in solution up to a concentration of about 60% w/v allowing for an effective dose to be delivered to the animal in a volume of 25 ml or less.
