$40.00 isn't bad for follow ups. As I'm sure most here will agree with your vet and his recommendations unless they themselves have some kind of degree as a Vet or at least Vet tech. One of our snakes came in with a minor RI and we did the Baytril. Tried an oral, but she kept spitting it up. She seems much better now, but we are keeping a really close eye on her and the vet says any remote signs of an RI we are to bring her in, but we also have to do as little to stress her out as possible as she has not eaten since we got her due to the stress of Vet trips, injections everyday for 8 days straight, and now she is starting to shed! Cost us over $200.00 to get her to this point!