What antibiotic is best to treat a kidney infection if I am allergic to sulfa drugs and penicillin? I am currently taking Bactrim DS Tablets but when I woke up this morning I had a rash all over and felt short of breath, I looked it up and it is a sulfa drug the best I understand it.
Good Day, and thank you for being with Chat Doctor ! Yes Bactrim is classified as a Sulfa Chat Doctor.  Other medications for UTI would be ciprofloxacin and other fluoroquinolones and cefuroxime or other cephalosporins. These are prescription