Baytril is cheap, and its administered orally through a syringe. The amount depends on the weight of your Chameleon. My chameleon just got off of Baytril. It is a very hard on your Chameleons digestive organs. It can reduce your Chameleons appetite. It has made my Chameleon constipated. Hasn't pooped in 5 days now.
The Baytril also didn't fix the lower respiratory infection in my Chameleon. So I recommend your Vet do a Culture and sensitivity test as the Baytril may not be the right antibiotic for the infection and cause your Chameleon more problems on top of his respiratory infection. At least that's what has happened to me. Culture and sensitivity test's can be expensive but is necessary. May I add you to my Friends list? I would like to see how this turns out for you.