Been searching for an effective spot on flea product for my elderly cat as vet visits are too stressful for her now. This one was tried with my usual "doubt it'll work but here goes!" attitude but I was wrong! 3 days after applying I found several dead adult fleas in her bedding and I was thrilled!!! Its early days but I'm hopeful I've finally found something that works as daily combing, as she is so old and frail, isn't something I want to continue.Very happy so far!! Only down side was trying to get through the packaging to the actual pipette, had to use scissors.