Ok so it's been 4 days since I brought them home. The two that are sick are in the same room as 8 baby chicks but in a separate enclosure. I am going to go get some Tylan today. Could powder be used? I will be moving the 8 baby chicks into the house and keeping the two sick birds in the room until I figure out what I want to really do (I keep going back and forth). Should I dose my 8 chicks as well and what would be the dosage for baby chicks? They range in ages 2-9 weeks old. So far the 8 aren't showing any symptoms of what is suspected to be Coryza. I talked to the lady about returning the chicks and she said she could take them back but I won't be getting my money back. I'm fine with that as I just want them gone but I don't want another unsuspecting customer getting them either.
Here is a good medicine chart for typical meds, uses, and their doses.
https://sites.google.com/a/poultrypedia.com/poultrypedia/medicine-chart
Tylosin (Tylan) is listed as useful against Coryza and a host of other bacterial infections, so it is a good broad based antibiotic. Be aware that you are still treating symptoms and that the birds could always be potential carriers, periodically shedding the bacterium if Coryza.
I would treat ALL that were in that room as Coryza is very infectious. You also have the issue that those other 8 chicks could become lifetime carriers as well, though they do not show outward symptoms now. I would recommend doing a lot of reading on Coryza from ag universities and vet literature to get a feel for what you want to do with all potentially exposed per the ag literature above. You may decide to vaccinate all new incoming birds to help protect them.
I am disappointed the seller won't refund the money. Selling obvious sick birds is not responsible business practices.
LofMc