Was about to buy this from PetsMart or Petco for 25 dollars, until I did some research and came across this website. So, much cheaper, especially when I have 3 cats, plus two being outdoors! Product seemed to work quickly, but my only con was no directions! I wasn't sure how many of the pills I was supposed to give to my cat. One every day, once a week, or once a month? Did days, and days of research, looks like it's only once a month. And the one pill should be enough, and I could do another the next month just to be sure. But, other than that.. Product works great, and I highly recommend it! This website has everything you're looking for, for your pet! And you can't beat the prices compared to other sites I have looked at!