Fish Aid Antibiotics Fenbendazole 250 mg is used as a worming agent in tropical fish. It is extremely effective in both fresh and salt water environments against most all types of worms, including: Tapeworms, Roundworms, Hookworms, Calamus, and Whipworms. It has replaced levamisole (Discomed) since the fish do not build a resistance to it. Fenbendazole can be dosed either as a tank treatment or in the fish food itself. It works so quickly that you will usually see worms protruding from infected fish within an hour!
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