You need to have a vet get a culture.
There are 3 types of RI. (Bacterial, Fungal,Viral)
You won't know which type it is without testing for it. Viral RI is rare and there is no treatment. Bacterial is the most common and comes in many forms. Its most likely a bacterial infection. Different antibiotics are used to treat certain types of bacterial RI. Some randomly prescribed stuff may or may not work.
So it is important to get a culture done to identify what kind of RI it is in order to prescribe a drug that specifically targets that bacteria. It will save you time and money in the long run.
Edit:kitedemon beat me
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