I bought hartz flea medication for my cat. It was the right one according to box. She became lethargic and would not move that day. She couldn’t pull her tounge in and her eyes couldn’t focus. I went to vet and they said hartz is the worst and should not be sold, that it is basically straight up poison . My female orange tabby developed neurological problems. That was from hartz. Can we sue ?dont use it to save a buck . Major life threatening side effects.