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Ivermectin does not treat MG. Erythromycin has been used in the past to treat it, but most antibiotics have egg withdrawal times. Can you tell her eggs apart from the others? Do not give it to anyone except the hen with symptoms if you use it.

Many drugs are not approved for poultry. Yes, I pointed out the 30 day drug withdrawal time for doxycycline in post 7. Tylosin has not egg withdrawal time for the oral treatment in the water. The dosage is more simple and you can get it online from Jedds.com.

What does the doxy look like? Do you have a picture of the label and dosage, ie—powder, tablets or strength? Here is a link about doxy, and there is a 30 day egg withdrawal time: https://www.backyardchickens.com/threads/doxycycline-and-tylosin-tylan-doses.1489737/

I would go ahead and treat the hen with either Tylosin or Doxycycline since she has symptoms of MG. They can sometimes have more than one infection at the same time, for example, infectious bronchitis which can affect egg shells. It is a virus, and won’t respond to antibiotics. It lasts about a...