Not sure what to say except that several vets have prescribed it, a couple made me promise I wouldn't eat the eggs, though one vet tech said they themselves eat the eggs, they just wait for a month. If your hen has a bacterial infection that is resistant to Tylan, Baytril is a good one to try. FWIW, I have peafowl here that have had blackhead in the past and they were treated with both Baytril and metronidazole (both banned for poultry) and I still eat the eggs.
If I were selling eggs or giving them away to people to eat, I would not use Baytril or metronidazole on those birds.