People are telling you something works because they don't see worms in the poop but that doesn't really mean anything. Scientific studies have shown these things don't work because fecal floats are done and analyzed under a microscope to look for worm eggs before and after dosing the birds and it shows no difference in load. You need to get the liquid Safeguard goat wormer. The dose is 1/4 ml per pound of body weight given orally, not in the water. Repeat in 7 days. That will clear up round worms.It's hard for me to beleave what will work when so many people are telling me what they use works. I'm going with zyfend for now if I see worms in their poop after 10 days of use then I'll switch to something else.
If you want to hit a larger variety of internal parasites, use the dose daily for 5 straight days in a row and you will get most species of worms.
Egg withdrawal is from the first dose until 14 days after the last dose given. Many people continue to eat the eggs from treated chickens but it is not recommended and the eggs certainly shouldn't be sold or given away to others for consumption.