Contains pyrantel pamoate to remove large roundworms (ascarids), Toxocara canis and Toxicaris leonina and hookworms, Ancylostoma caninum and Uncinaria stenocephala in puppies and dogs. Prevents reinfection of Toxocara canis in puppies and adult dogs and in lactating bitches after whelping. One dose works within 24 hours to virtually rid the pet of roundworms and hookworms. No fasting or laxatives are required.