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Panacur is the brand name of an oral deworming medication with the active ingredient fenbendazole. It is used to treat internal parasites in domestic animals, including dogs, cats, horses, and livestock. In dogs, Panacur is most often used to treat hookworm, roundworm, tapeworm (Taenia), and whipworm infections, although it is important to note that Panacur is not effective against Dipylidium tapeworms. In addition to these worms, Panacur (fenbendazole) is approved in Europe to treat Giardia in dogs and is sometimes used off-label in the U.S. to deal with Giardia infections. It is also occasionally used off-label to combat lungworm infections. How Does Panacur Work? Deworming medications work in different ways to eliminate parasites. Some target specific life stages, while others attack the biological processes of the parasite. Fenbendazole kills parasites by binding to tubulin (a type of protein), which interferes with the parasites' ability to form microtubules, which combine to form the structure of the worm cells.