Reptile, since the Baytril is working, then that is what your snake needs to be on. If the snake hadn't shown improvement after 2-3 injections, then the antibiotic would need to be changed. Baytril is a very potent broad-spectrum antibiotic and works well for most respiratory infections.
It's really not as expensive as you may think, I have a 100ml bottle of the 100mg/ml concentration and it only cost me around $70. I love my vet
