Imidaflea is an insecticide spot-on solution that kills adult fleas by acting upon the nervous system, causing paralysis and death of these unwanted creepy crawlies! Imidaflea for Cats and Pet Rabbits: For the prevention and treatment of flea infestations. Fleas are killed within one day following treatment. One treatment prevents further flea infestation for three to four weeks on cats and up to one week on pet rabbits.