Nitrofurantoin
"Ended up with a pretty bad UTI Friday afternoon & unable to see my primary Doctor that same day. I knew the symptoms as such since I had experienced one UTI's in the past (2). By Saturday the next morning I was sitting in the lobby of walk in clinic in desperation. I was seen by Doctor & prescribed Nitrofurantoin 100mg 1 tab every 12 hours. I am not a big advocate of pill popping, but I knew this was serious. I have to say that within 6 hours of taking my 1st dose, I was already feeling a bit of relief. I'm on my 3rd day & pain is gone!!. The only symptom I have noticed is an occasional headache & kind of a lethargic overall feeling. Other than that I am really happy that I'm on the road to a full recovery."