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There is more than one form of ivomectrin, the name of the drug, that can be used in chickens, but you need to know the dose for the particular form you buy. None are marketed for chickens, but many on here use them.
Epinrex is the one I have used. You drop (a needleless syringe is the simplest way) 0.5 cc on the skin, under the feathers, on the back of the neck, for adult large fowl chickens. The dose is different for bantams. This is the only dose I know because it's the only one I have ever used. It's marketed for cattle.
People do use Wazine in layers; you just aren't supposed to eat the eggs for a while, I don't know how long.
There are other wormers besides these two. Often, Wazine is used first, in case there is a large infestation, so it won't shock the chicken so badly, as it only treats one kind of worm (roundworm.)
Worming is something one should really research thoroughly on here before deciding how to go about it. I used to have a link to an excellent worming thread; unfortunately, I lost it in a computer crash.