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https://www.backyardchickens.com/t/580850/duramycin Here is a link to a thread all about it....the withdrawal period is 21 days from last dose. I didn't read through the entire link but I'm hoping that it will answer your other questions as well. The antibiotic is passed through to the eggs...

The antibiotic does pass into the egg. I do not believe that it will harm either you or your neighbors. I'm not sure of the withdrawal period for duramycin but I will try and look it up for you.