Even with dogs, its not always easy to slip them the Black-Walnut Hull, Wormwood , etc., in their food. Imagine cats!
If Parlixer works and has no side effects, i'd say go for it. Especially since housepets --especially cats-- tend to get parasites, and these parasites do infect humans-- even though the Veternarians dont like to admit this.
Yes, people have even gotten heartworm from their dogs- and I specifically remember our Veterinarian insist that this is not possible. parasites have a way of adapting and evolving- and infecting things that they never used to infect years ago. Also, as Dr. Hulda points out- our increasing toxic chemical beauty & cleaning products, etc., makes this possible for these parasites to live in humans full stage.
Not every Veterinarian is knowledgable about this- and still insist humans wont get animal parasites.
I know Im a Vegetarian who wont touch anything with chemicals- and I dont take too kindly with drug companies-- however, If I had cats with parasites, i'd give them this drug- and after it was all over, I'd make sure i gave them massages , lots of filtered water, and other things to help eliminate any toxic side effects.