The whole purpose of an antibiotic is to introduce antibodies into the system to fight the ones that are causing a problem, unless you determine the type of ones that are causing it you are waisting your time, the likes of Baytril are broad spectrum antibiotics and cover a mumber of bad bacteria but you may not be targetting the right ones. Excessive use of antibiotics allows bacteria to become immune to them and new ones have to be introduced.
Probiotics contain the good bateria that should be present in the gut and should be given after any course of antibiotic and some give it regularily to maintain good health
We were prescribe Baytril as a first step in treating a sick bird till the tests come back from the vets, luckily it covered the infectious one :-/ Best to get your bird of it's droppings teasted to see the real problem, three years ago I had to cull my whole loft due to inexperience and treating blind, a tough learning curve that I have learned a lot from it
1. Isolate any sick or suspect birds
2. Quaranteen all new burds no matter where they come from
3. Do not treat blind it may be a lot more expensive in the long run
4. Post ALL the symptoms on the forum and see if anyone can help, a puffed up bird could be anything or nothing