Abstract: A formulation for treating and preventing parasite infestations in horses, dogs, cats, and other animals is provided. This formulation includes a cestocidal agent, wherein the cestocidal agent is pyrantel, morantel, any salt thereof, or any combination thereof. Preferably the formulation additionally includes an edible non-aqueous liquid and a thickening agent. The formulation of the present invention allows for a high concentration of cestocidal agent.