i just read this about 12 hours after applying drops and a collar to my kitten!

i have a young kitten and recently relized that he had fleas i applied hartz drops and hartz flea collar about 12 hours ago. i removed the collar just now after reading this. there doesn’t seem to be any reaction and the cat seems healthy. Do i still need to be worried? it can’t affect all cats or it would be banned right?
curious/worried

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