After an animal takes fenbendazole tablets, the medicine begins acting against susceptible parasites by disrupting essential cellular processes. Fenbendazole can interfere with the parasites’ ability to absorb nutrients and maintain normal energy functions, gradually weakening and helping eliminate them from the body. The response to treatment may vary depending on the animal, parasite type, severity of infection, and prescribed treatment schedule. Some animals may show gradual improvement in appetite, energy, or bowel movements as the infection is controlled. In certain cases, parasite material may be noticed in the stool. Fenbendazole should be given exactly according to veterinary instructions and the product label. Complete the recommended treatment course unless a veterinarian advises otherwise. Do not give extra doses to speed up results.