BOTH of my cats got worms at the same time. It seemed that the current flea treatment we had been using became ineffective, they got fleas and worms very quickly. I used these pills, appropriate doses for their weight, and the worms were gone in ONE DAY. The price was the least expensive that I could find, and it couldn't have worked better. My cats don't take pills, and they spit them out if I hide them in cheese. So, I figured the dose for one cat, crushed the pill completely with the back of a spoon to powder, and mixed it with a little butter. I picked up the wad of butter/medication with my fingertip and just stuck it in their mouth. They were indignant that I had done such a thing, but they licked it out of their mouth and the administration of the pill was successfully delivered to their digestive systems.