I just adopted a kitten from a young girl you couldnt handle her. She is 8-9 weeks old and has a horrid flea problem. My neighbor had revolution for his kitten and gave me one. I applied to the back of the neck on my kitten. I then read the box and it said from 5-15lbs and 8weeks old. (She may way 2 lbs at most) Should i be worried as long as she doesnt lick the spot? Or should i take her to the vet now? I am quite worried as I have read that some kittens have died due to revolution overdose.