Known as Baytril or Flotril (depending on Country), enrofloxacin is in a class of safer antibiotics called fluoroquinolones which have a common side effect of causing tissue damage and discoloration at the injection site. The result is scar tissue and is permanent. It is typically used for respiratory, skin, and muscle tissue infections. Another fluoroquinolone antibiotic known as ciprofloxacin, or Cipro, is not as well known by most vets because it is a human drug. It comes in pill form, and if the snake is feeding, it is a great choice for the above infections, and also enteric (intestinal) infections. The appropriate size dose can just be inserted into the smallest size prey item the snake will eat. It has a little wider spectrum of bacterial activity and you avoid the tissue damage caused by enrofloxacin. Any vet can write a prescription for it and help size the dose for you. It is dosed at 10 mg/kg every 48 hours. As always, have a vet check the snake for a proper diagnosis. Hope this helped.
Kelly