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Depends on the wormer. I know one person that uses the same wormer I do - valbazen (albendazole) and doesn't throw the eggs away at all. While I wouldn't recommend that, I can tell you that albendazole is what is commonly prescribed to treat worms in humans, so I can't see where it would harm you.
Some folks worm routinely (even more often than once a year). Some never worm. Others only use natural products, that may or may not work.
My thinking is, I worm my dogs and cats once a year. My dogs are on heartworm preventative they take each month. Why would I treat my chickens any different?
Definitely should observe a witholding period of 14 days before eggs or meat are eaten if giving albendazole (and most other wormers, see label for witholding period, some are longer). Albendazole is a teratogen, meaning it causes serious birth defects, so it is a major hazard for pregnant women or any women that may become pregnant OR any man that may contribute to a pregnancy. It can also cause liver problems in rare cases in adults.
As I said, thats just what one friend of mine chooses to do. I would never chance it, not with my drug allergies.
P.S. You can't check the label on albendazole for egg withdrawel period, since it's used off label. There are no instructions on the bottle for giving it to chickens.
I did once find a website for a guy in Alabama that was selling very small (3-4 oz.) bottles of a broad spectrum wormer "especially for chickens". He was charging something like $25 for that tiny bottle. Some sleuthing and it turns out what he was selling was albendazole, just put in smaller bottles.