it is for Resp illness in chickens and turkeys. unless the illness is very advanced it should help. have to make new batches daily, but it is easy to give it to everyone.
not sure, but probably easier to dose the water with antibiotic, check tractor supply or the local feed store for it. can't remember the name, but comes in a yellow foil bag.
injectable can damage meat as i have heard
RobertH
edit: found it...