Chickens coughing (?) and sound like they are drowning

[ki4got]

I was only able to find one feed store that carried antibiotics for poultry. I have been giving it to the entire flock for three days now and the birds that got sick first, are acting almost completely healthy. The birds that were acting healthy are now sick, but not nearly as bad. The roo even felt well enough to chase me out of the coop yesterday and he was romancing his hens this morning. I think we are on the mend! Thanks everyone for the help!

just remember to follow the full dosing schedule. don't stop early because they're looking good, because if it comes back it'll be harder to kick the second time around.