Durvet WormEze is a liquid de-wormer for cats and dogs for the removal of large roundworms (Toxocara canis, Toxocara cati and Toxascaris leonine). Use directly in pet's food or drinking water. Can also be used for puppies and kittens over 6 weeks of age. Flavor has been added to the liquid to make it palatable to pets. The active ingredient is piperazine citrate (275 mg/teaspoon).