Species: Cats, Rabbits more than 4 kg. Active ingredient: Imidacloprid. Uses: For the prevention and treatment of flea infestations on cats. For the treatment of flea infestations on pet rabbits. Fleas are killed within one day following treatment. One treatment prevents further flea infestation for up to four weeks on dogs, three to four weeks on cats and up to one week on pet rabbits.