Good advice Becky! We have to remember people, that over using and prescribing medicine can lead to problems with resistance in the future. Or in some cases, not even cure the problem!
There are obviously some major differences between Tylan and Baytril, the most notable to owners is price. Baytril is expensive, but it is a broad spectrum anti-biotic. I have used baytril on rats , and they have made complete and full recoveries from their RI.
For snakes, prescribing something yourself that has just been said by Becky to be useful against only Myco is missing the benefits of a broad spectrum anti-bacterial product.
I would hope everyone does the responsible thing and takes their animal to the Vet for a culture. It's best to know what your dealing with from the start. And don't promote the misuse of medicine, it CAN create resistances, especially if it is not used for the full amount of time, and can make your snake or animal sick (and probably worse) off again.
