Specially developed to make worming easy, without the bites, scratches and other problems associated with trying to give tablets to a cat. Simply apply the solution to the back of your cat's neck for fast effective tapeworm treatment. Spot On Dewormer starts working almost immediately and is 100% effective at controlling tapeworm in cats and kittens. There is no permanent treatment for worms. Veterinarians recommend that weaned kittens and adult cats be wormed every 3 months as a routine measure. It is also important to remove sources of possible re-infestation, such as fleas and mice. Suitable for cats and weaned kittens weighing more than 1kg.