I followed the directions and applied Heartz flea drops to my adult 1 1/2 year old blind cat and one hour later she was having terrible seizures so we rushed her to the emergency vet . After 1 day and a $700 vet bill they could not save her. I called Heartz and they gave me a case number and requested a autopsey at there expense . Has any one had any luck with legal action This product needs to off the market !!