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The reason that there is a withdrawl period isn't because Ivermectin can "poison" a person. It is because it is used to treat worms in humans. Giving a non-lethal dose, like what you would get from eating eggs or the chicken, may help worms become resistant to Ivermectin. Then if you needed treatment for worms -- Ivermectin would be useless. Same with using most antibiotics in chickens. You may create resistant bacteria by eating small doses of antibiotics in your chicken or eggs.
Dale-Ann
Ditto. This is why I prefer to use sevin dust rather than ivermectin or eprinex when treating for lice/mites. The wormers are just that...wormers, why build worm immunity when you're only treating for lice/mites? Dont get me wrong, I'd use the ivermectin or eprinex in a pinch if I didnt have sevin dust on hand. Additionally their house, roost and nests must be treated as well...that's where the sevin dust comes in, might as well use it on the chickens. Sevin dust is a heck alot cheaper than ivermectin or eprinex.