Although I cannot say whether this fully worked yet or not, I CAN say it seems to be working. I got this medication for my kitten, who is roughly 3 pounds. Directions say 1/2 tablet for that weight. I was trying to figure out a good way to give it to her, so I tried it in food. I barely pushed down on the tablet and it turned into almost a powder. It was very easy to disguise in some cat food. She ate the food and did not seem to notice any difference. Some medications have a funny taste and animals won't eat them, but this did not smell like anything to me, nor did my cat notice it in her food. Each bottle comes with 3 tablets and do not expire for 2-4 years. (my bottle is good for 3 years but I am sure it differs). It's been 2 days since she has had this medication and I have not noticed one single tape worm, which were sometimes seen on her tail hair before. She has had NO side affects. Has not made her sleepy, less active and has no ruined her appetite. Would highly recommend this medicine, as it's fairly cheap, easy to give and has no side affects.