Its FDA approved product and has amazing Anthelmentic properties. Active against Asariasis (round worm) Eosinophiltic Enterocolitis (hook worm), varities of Schistosome, Cestodes and Trematodes (Flat worm, Tape worm). It kills the internal parasites in a cats body keeping him healthy. It provides protection against all form of worm infestations commonly found in pets.