First I will say that no one here is a vet and no one should attempt to play one by recommending a specific antibiotic along with dosage whether it is publically or even privately (which make the recommendations even more risky as no one will be there to contradict the person)
There are different antibiotics for a reason and only a her QUALIFIED vet should be prescribing them.
While some people have had success with Tylan it does not mean that YOU will, Tylan class antibiotic that is effective against gram positive bacteria, this mean the first step is to know what type of RI you are dealing with.
Now was your vet a herp qualified vet? Was a culture performed prior to treatment? What were the results of the culture? What type of antibiotics were prescribed and for how long?
In a lot of cases where RI would not go away it was often due to the fact that oral antibiotic were prescribes which are not effective with snakes or that they were not prescribed for long enough or prescribed without a culture, all which shows the lack of knowledge when it comes to reptiles in general and would lead me to recommend you to find another vet.
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