This invention relates to pharmaceutical and veterinary formulations providing enhanced solvency and stability for pharmaceutical and veterinary agents for administration to animals, especially ruminants. In addition, the invention relates to pour-on formulations for combating parasites in animals, such as cattle and sheep. In some embodiments, this invention provides glycol-ether-based pour-on formulations comprising a composition comprising a flukicide, such as, for example, clorsulon (4-amino-6-trichloroethenyl-1,3-benzene disulfonamide) and/or a macrolide anthelmintic or antiparasitic agent. In other embodiments, the invention provides pour-on formulations comprising at least one active agent, a glycol ether, and a stability enhancer. This invention also provides for methods for eradicating, controlling, and/or preventing parasite infestation in animals, such as cattle and sheep.
