Liquid Wormer 2X is used to prevent reinfestation of Toxocara canis in puppies and adult dogs and in lactating bitches after whelping. For the removal of large roundworms, (Toxocara canis and Toxascaris leonina) and hookworms, (Ancylostoma caninum and Uncinaria stenocephala). Safe to use on lactating bitches two weeks after whelping. Safe to use on puppies as young as two weeks. Do not have to withhold food prior to using.