Crow_noir, roundworms rarely show up in fecal matter unless they get very bad. They look much like spaghetti and are usually vomited up. The ones most commonly seen are tapeworm segments, which look like tiny specks of white rice. Recommending something like that probably isn't a good idea. She could easily take the cat to a deworming clinic to get them dewormed by a vet who knows what they are doing, and Petsmart sells Tapeworm Tabs over the counter that work very well, Praziquantal...or however it is spelled. It's the equivalent of Drontal or Droncit and will kill not only tapes, but roundworms and hookworms. Just because you used this remedy (which sounds very sketchy to me) doesn't mean it is safe to use!

And not to jump on the bandwagon here but I wholeheartedly agree with Shais_mom and Kay!