Last night I used Hartz Advanced Care Flean and Tick Drops+ and woke up to a frightened, shaking, irritated cat. I realized it must be the drops and went to the Web for information only to find TONS of warnings and tragic stories! I have since bathed the cat (not an easy task) and am off to the vet. Wish us luck. This product MUST be removed from the market! A cat can live with a flea problem, nurological damage is another issue!