I fought an RI with baytril injections for well over a month and finally we decided to try another type of injection and within two days the snake was eating, drinking, and breathing normally again. It was incredible! Ask for another kind of antibiotic before giving up. I thought the snake was going to die a couple of times but he kept fighting and now he is unbelievably healthy. He eats everything i throw at him no problem and is up from around 300grams to well over 600grams in only a couple of months.
The other injection cost me $20 and was a one time shot. 100% worth trying.
Btw it was my normal male that had the RI, my first ball python. Dont give up just yet.